Tag Archives: AL08

Hurricane Fiona Nears Canadian Maritimes

Hurricane Fiona neared the Canadian Maritimes on Friday night. At 11:00 p.m. EDT on Friday the center of Hurricane Fiona was located at latitude 44.5°N and longitude 60.8°W which put it about 140 miles (220 km) east of Halifax, Nova Scotia. Fiona was moving toward the north at 46 m.p.h. (74 km/h). The maximum sustained wind speed was 105 m.p.h. (165 km/h) and there were wind gusts to 125 m.p.h. (200 km/h). The minimum surface pressure was 933 mb.

A Hurricane Warning was in effect for the portion of the coast from Hubbards to Brule, Nova Scotia. Hurricane Warnings were in effect for Prince Edward Islands and Isle de la Madeline. A Hurricane Warning was in effect for the portion of the coast from Parson’s Pond to Francois, Newfoundland. A Tropical Storm Warning was in effect for St. Andrews, New Brunswick to Hubbards, Nova Scotia. A Tropical Storm Warning was in effect for the portion of the coast from Brule, Nova Scotia to Cap Madeline, Quebec. Tropical Storm Warnings were in effect for Anticosti Island and for the portion of the coast from Sheldrake, Quebec to Parson’s Pond, Newfoundland. A Tropical Storm Warning was in effect for the portion of the coast from Boat Harbor to Hare Bay, Newfoundland. A Tropical Storm Warning was in effect for the portion of the coast from Francois to St. Lawrence, Newfoundland. A Tropical Storm Watch was in effect for the portion of the coast from Boat Harbor, Newfoundland to West Bay, Labrador.

Hurricane Fiona was making a rapid transition to a large, powerful extratropical cyclone on Friday night. The former eye and eyewall were no longer present at the center of Fiona. Most of the remaining thunderstorms were in bands northeast of the center of Fiona’s circulation. Cooler drier air was wrapping around the western and southern sides of the circulation. Upper level divergence above Hurricane Fiona was still pumping mass away and the surface pressure remained around 933 mb.

Hurricane Fiona grew much larger during the transition to an extratropical cyclone. Winds to hurricane force extended out 185 miles (295 km) from the center of Fiona’s circulation. Winds to tropical storm force extended out 345 miles (555 km) from the center of circulation. The Hurricane Intensity Index (HII) for Hurricane Fiona was 17.8. The Hurricane Size Index (HSI) was 48.4 and the Hurricane Wind Intensity Size Index (HWISI) was 66.2. Hurricane Fiona was capable of causing extensive serious damage.

An upper level trough over eastern Canada will steer Hurricane Fiona quickly toward the north during the weekend. The strongest winds will occur over eastern Nova Scotia and western Newfoundland. Strong winds will also affect the rest of Nova Scotia and Newfoundland, Prince Edward Island, parts of New Brunswick, Quebec and Labrador. The large circulation around Hurricane Fiona could cause widespread electrical outages. Locally heavy rain could cause floods in some places. Large waves and a storm surge could cause damage along the coast.

Elsewhere over the Atlantic Ocean, Tropical Storm Gaston brought wind and rain to the Azores, Tropical Storm Hermine moved northeast of the Cabo Verde Islands and Tropical Storm Ian formed over the Caribbean Sea.

At 11:00 p.m. EDT on Friday the center of Tropical Storm Gaston was located at latitude 38.9°N and longitude 29.5°W which put it about 50 miles (80 km) west-northwest of the Faial, Azores. Gaston was moving toward the southwest at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h). The minimum surface pressure was 999 mb.

Tropical Storm Warnings were in effect for Corvo, Flores, Faial, Pico, Sao Jorge, Graciosa, and Terceira.

At 11:00 p.m. EDT on Friday the center of Tropical Storm Hermine was located at latitude 19.4°N and longitude 20.8°W which put it about 315 miles (505 km) northeast of the Cabo Verde Islands. Hermine was moving toward the north at 10 m.p.h. (16 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1002 mb.

At 11:00 p.m. EDT on Friday the center of Tropical Storm Ian was located at latitude 14.8°N and longitude 72.0°W which put it about 385 miles (625 km) southeast of Kingston, Jamaica. Ian was moving toward the west-northwest at 12 m.p.h. (19 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1005 mb.

Hurricane Watches were in effect for the Cayman Islands including Grand Cayman, Little Cayman and Cayman Brac. A Tropical Storm Watch was in effect for Jamaica.

Hurricane Fiona Blows Past Bermuda

Hurricane Fiona blew past Bermuda on Thursday night. At 8:00 a.m. EDT on Friday the center of Hurricane Fiona was located at latitude 34.1°N and longitude 64.9°W which put it about 125 miles (200 km) north of Bermuda. Fiona was moving toward the north-northeast at 25 m.p.h. (40 km/h). The maximum sustained wind speed was 125 m.p.h. (200 km/h) and there were wind gusts to 150 m.p.h. (240 km/h). The minimum surface pressure was 936 mb.

A Tropical Storm Warning was in effect for Bermuda. A Hurricane Warning was in effect for the portion of the coast from Hubbards to Brule, Nova Scotia. Hurricane Warnings were in effect for Prince Edward Islands and Isle de la Madeline. A Hurricane Warning was in effect for the portion of the coast from Parson’s Pond to Francois, Newfoundland. A Tropical Storm Warning was in effect for St. Andrews, New Brunswick to Hubbards, Nova Scotia. A Tropical Storm Warning was in effect for the portion of the coast from Brule, Nova Scotia to Cap Madeline, Quebec. Tropical Storm Warnings were in effect for Anticosti Island and for the portion of the coast from Sheldrake, Quebec to Parson’s Pond, Newfoundland. A Tropical Storm Warning was in effect for the portion of the coast from Boat Harbor to Hare Bay, Newfoundland. A Tropical Storm Warning was in effect for the portion of the coast from Francois to St. Lawrence, Newfoundland. A Tropical Storm Watch was in effect for the portion of the coast from Boat Harbor, Newfoundland to West Bay, Labrador.

The center of Hurricane Fiona passed west of Bermuda on Thursday night. The L. F. Wade International Airport in Bermuda reported a sustained wind speed of 64 m.p.h. (103 km/h) and a wind gust of 83 m.p.h. (134 km/h). There were reports of stronger wind speeds measured by automated stations in higher locations in Bermuda.

Hurricane Fiona continued to be a large, well organized hurricane. A circular eye with a diameter of 35 miles (55 km) was at the center of Fiona’s circulation. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms revolved around the core of Hurricane Fiona. Storms near the core generated strong upper level divergence that pumped mass away from the hurricane.

Hurricane Fiona grew into a large hurricane as it moved farther north on Thursday night. Winds to hurricane force extended out 90 miles (145 km) from the center of Fiona. Winds to tropical storm force extended out 345 miles (555 km) from the center of circulation. The Hurricane Intensity Index (HII) was 23.6. The Hurricane Size Index (HSI) was 32.70 and the Hurricane Wind Intensity Size Index (HWISI) was 56.3. Hurricane Fiona was larger than Hurricane Jeanne was in 2004.

Hurricane Fiona will move through an environment that will become less favorable for a major hurricane during the next 24 hours. Fiona will move over water where the Sea Surface Temperatures colder than 26˚C. An upper level trough near the East Coast of the U.S. will produce southwesterly winds that will blow toward the top of Fiona’s circulation. Those winds will cause the vertical wind shear to increase. Hurricane Fiona will start to weaken gradually when the wind shear increase. A combination of colder Sea Surface Temperatures and moderate vertical wind shear will cause Hurricane Fiona to make a transition to a very strong extratropical cyclone.

The upper level trough near the East Coast of the U.S. will steer Fiona toward the north-northeast during the next 24 hours. On its anticipated track, Hurricane Fiona will move away from Bermuda on Friday. Hurricane Fiona will approach the Canadian Maritimes on Friday night. Fiona will bring strong, destructive winds to the Canadian Maritimes. Heavy rain could cause floods in some locations.

Elsewhere over the Atlantic Ocean, Tropical Storm Gaston was bringing wind and rain to the Azores and Tropical Depression Nine formed over the southeastern Caribbean Sea. Tropical Storm Warnings were in effect for Corvo, Flores, Faial, Pico, Sao Jorge, Graciosa, and Terceira. At 8:00 a.m. EDT on Friday the center of Tropical Storm Gaston was located at latitude 40.5°N and longitude 29.2°W which put it about 135 miles (215 km) north-northwest of the Faial. Gaston was moving toward the east-southeast at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h). The minimum surface pressure was 999 mb.

At 5:00 a.m. EDT on Friday the center of Tropical Depression Nine was located at latitude 13.9°N and longitude 68.6°W which put it about 615 miles (985 km) east-southeast of Kingston, Jamaica. The tropical depression was moving toward the west-northwest at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 35 m.p.h. (55 km/h) and there were wind gusts to 45 m.p.h. (75 km/h). The minimum surface pressure was 1006 mb. Tropical Depression Nine is forecast to intensify to a hurricane over the northwestern Caribbean Sea during the weekend. It could move over the southeastern Gulf of Mexico early next week.

Hurricane Fiona Moves Toward Bermuda

Hurricane Fiona moved toward Bermuda on Thursday morning. At 8:00 a.m. EDT on Thursday the center of Hurricane Fiona was located at latitude 28.0°N and longitude 70.6°W which put it about 455 miles (735 km) southwest of Bermuda. Fiona was moving toward the north-northeast at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 130 m.p.h. (200 km/h) and there were wind gusts to 150 m.p.h. (240 km/h). The minimum surface pressure was 934 mb.

A Hurricane Warning was in effect for Bermuda.

Hurricane Fiona moved closer to Bermuda on Thursday morning. A circular eye was at the center of Fiona’s circulation. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Hurricane Fiona. Storms near the core generated upper level divergence that pumped mass away from the hurricane. The removal of large quantities of mass was allowing the surface pressure to remain low.

Hurricane Fiona increased in size as it moved farther north. Winds to hurricane force extended out 65 miles (105 km) from the center of Fiona. Winds to tropical storm force extended out 200 miles (325 km) from the center of circulation. The Hurricane Intensity Index (HII) was 25.1. The Hurricane Size Index (HSI) was 24.0 and the Hurricane Wind Intensity Size Index (HWISI) was 49.1. Hurricane Fiona was similar in size and intensity to Hurricane Jeanne from 2004.

Hurricane Fiona will move through an environment that will become less favorable for a major hurricane during the next 24 hours. Fiona will move over water where the Sea Surface Temperatures are near 28˚C. An upper level trough near the East Coast of the U.S. will produce southwesterly winds that will blow toward the top of Fiona’s circulation. Those winds will cause the vertical wind shear to increase. Hurricane Fiona will start to weaken gradually when the wind shear increase.

The upper level trough near the East Coast of the U.S. will steer Fiona toward the northeast during the next 24 hours. On its anticipated track, the center of Hurricane Fiona will be a little to the west of Bermuda on Thursday night. Fiona is likely to be a major hurricane when it gets to Bermuda. Hurricane Fiona will bring strong, gusty winds and heavy rain to Bermuda. Fiona could approach the Canadian Maritimes on Saturday.

Elsewhere over the Atlantic Ocean, Tropical Storm Gaston prompted Tropical Storm Warnings for the Azores. Tropical Storm Warnings were in effect for Corvo, Flores, Faial, Pico, Sao Jorge, Graciosa, and Terceira. At 8:00 a.m. EDT on Thursday the center of Tropical Storm Gaston was located at latitude 40.7°N and longitude 34.5°W which put it about 340 miles (550 km) west-northwest of the Azores. Gaston was moving toward the east-northeast at 17 m.p.h. (28 km/h). The maximum sustained wind speed was 65 m.p.h. (105 km/h) and there were wind gusts to 80 m.p.h. (130 km/h). The minimum surface pressure was 1000 mb.

Hurricane Fiona Intensifies to Cat. 4

Hurricane Fiona intensified to Category 4 on the Saffir-Simpson Scale on Wednesday morning. At 8:00 a.m. EDT on Wednesday the center of Hurricane Fiona was located at latitude 24.2°N and longitude 71.7°W which put it about 700 miles (1125 km) southwest of Bermuda. Fiona was moving toward the north at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 130 m.p.h. (200 km/h) and there were wind gusts to 150 m.p.h. (240 km/h). The minimum surface pressure was 937 mb.

A Hurricane Watch was issued for Bermuda. A Tropical Storm Warning was also in effect for Bermuda.

Hurricane Fiona continued to intensify over the warm Atlantic Ocean east of the Bahamas on Wednesday morning. A circular eye with a diameter of 30 miles (50 km) was present at the center of Fiona’s circulation. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Hurricane Fiona. Storms near the core generated upper level divergence that pumped mass away from the hurricane. The removal of large quantities of mass was causing the surface pressure to decrease.

Hurricane Fiona maintained its size as it strengthened during Tuesday night. Winds to hurricane force extended out 45 miles (75 km) from the center of Fiona. Winds to tropical storm force extended out 160 miles (260 km) from the center of circulation. The Hurricane Intensity Index (HII) was 25.1. The Hurricane Size Index (HSI) was 14.8 and the Hurricane Wind Intensity Size Index (HWISI) was 39.9.

Hurricane Fiona will move through an environment favorable for intensification during the next 24 hours. Fiona will move over water where the Sea Surface Temperatures are near 29˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Hurricane Fiona is likely to intensify during the next 24 hours. If the inner end of a rainband wraps around the existing eye and eyewall, then an eyewall replacement cycle could cause Hurricane Fiona to weaken.

Hurricane Fiona will move around the western side of a subtropical high pressure system over the Atlantic Ocean. The high pressure system will steer Fiona toward the north during the next 12 hours. An upper level trough near the East Coast of the U.S. will start to steer Fiona toward the northeast on later Wednesday. On its anticipated track, Hurricane Fiona will affect Bermuda on Thursday night. Fiona could be a major hurricane when it gets to Bermuda. Hurricane Fiona could approach the Canadian Maritimes on Saturday.

Elsewhere over the Atlantic Ocean, Tropical Storm Gaston strengthened west of the Azores. At 5:00 a.m. EDT on Wednesday the center of Tropical Storm Gaston was located at latitude 37.5°N and longitude 42.6°W which put it about 850 miles (1370 km) west of the Azores. Gaston was moving toward the northeast at 16 m.p.h. (26 km/h). The maximum sustained wind speed was 65 m.p.h. (105 km/h) and there were wind gusts to 80 m.p.h. (130 km/h). The minimum surface pressure was 1000 mb.

Hurricane Fiona Moves Away from the Turks and Caicos

Hurricane Fiona moved away from the Turks and Caicos on Tuesday night. At 11:00 p.m. EDT on Tuesday the center of Hurricane Fiona was located at latitude 23.2°N and longitude 71.8°W which put it about 95 miles (155 km) north of Caicos Island. Fiona was moving toward the north at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 125 m.p.h. (200 km/h) and there were wind gusts to 150 m.p.h. (240 km/h). The minimum surface pressure was 947 mb.

A Tropical Storm Watch was in effect for Bermuda.

Hurricane Fiona strengthened on Tuesday night as it moved away form the Turks and Caicos. A circular eye with a diameter of 23 miles (37 km) was at the center of Fiona’s circulation. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Hurricane Fiona. Storms near the core generated upper level divergence that pumped mass away from the hurricane. The removal of large quantities of mass was causing the surface pressure to decrease.

Hurricane Fiona grew larger as it strengthened. Winds to hurricane force extended out 45 miles (75 km) from the center of Fiona. Winds to tropical storm force extended out 160 miles (260 km) from the center of circulation. The Hurricane Intensity Index (HII) was 23.6. The Hurricane Size Index (HSI) was 14.8 and the Hurricane Wind Intensity Size Index (HWISI) was 38.4.

Hurricane Fiona will move through an environment favorable for intensification during the next 24 hours. Fiona will move over water where the Sea Surface Temperatures are near 29˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Hurricane Fiona is likely to intensify during the next 24 hours. Fiona could strengthen to Category 4 on the Saffir-Simpson Scale. If the inner end of a rainband wraps around the existing eye and eyewall, then an eyewall replacement cycle could cause Hurricane Fiona to weaken temporarily.

Hurricane Fiona will move around the western side of a subtropical high pressure system over the Atlantic Ocean. The high pressure system will steer Fiona toward the north during the next 12 hours. An upper level trough near the East Coast of the U.S. will start to steer Fiona toward the northeast on later Wednesday. On its anticipated track, Hurricane Fiona will affect Bermuda on Thursday night. Fiona could be a major hurricane when it gets to Bermuda. Hurricane Fiona could approach the Canadian Maritimes on Saturday.

Elsewhere over the Atlantic Ocean, Tropical Storm Gaston formed west of the Azores. At 11:00 p.m. EDT on Tuesday the center of Tropical Storm Gaston was located at latitude 36.2°N and longitude 43.6°W which put it about 920 miles (1485 km) west of the Azores. Gaston was moving toward the north-northeast at 18 m.p.h. (30 km/h). The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 65 m.p.h. (105 km/h). The minimum surface pressure was 1004 mb.

Tropical Storm Henri Brings Wind and Rain to Northeast U.S.

Tropical Storm Henri brought wind and rain to the northeast U.S. on Sunday. At 2:00 p.m. EDT on Sunday the center of Tropical Storm Henri was located at latitude 41.4°N and longitude 71.8°W which put it about 5 miles (10 km) north of Westerly, Rhode Island. Henri was moving toward the northwest at 9 m.p.h. (15 km/h). The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 65 m.p.h. (105 km/h). The minimum surface pressure was 991 mb. Tropical storm force winds extended out 130 miles on the eastern side of Henri. Tropical Storm force winds extended out 80 miles in the western half of the circulation.

A Tropical Storm Warning was in effect for the portion of the coast from East Rockaway Inlet, New York to Chatham, Massachusetts. The Tropical Storm Warning included all of Long Island, Block Island, Martha’s Vineyard and Nantucket.

Former Hurricane Henri weakened back to a tropical storm on Sunday morning when it moved over cooler water north of the Gulf Stream. Even though it was weaker, Tropical Storm Henri was producing gusty winds along the coast. A weather station on Block Island, Rhode Island reported a sustained wind speed of 52 m.p.h. (84 km/h) and a wind gust to 65 m.p.h. (105 km/h). A weather station at Point Judith, Rhode Island reported a sustained wind speed of 51 m.p.h. (82 km/h) and a wind gust to 69 m.p.h. (111 km/h). A NOAA C-MAN station at Buzzards Bay, Massachusetts reported a sustained wind speed of 49 m.p.h. (79 km/h) and a wind gust to 57 m.p.h. (92 km/h). The gusty winds were causing scattered power outages in southern New England.

Tropical Storm Henri was also dropping heavy rain over parts of the northeastern U.S. Flash Flood Watches were in effect for northeastern Pennsylvania, southeastern New York and southern New England.

Tropical Storm Henri will move slowly toward the northwest during the rest of Sunday. The westerly winds in the middle latitudes will begin to steer Henri toward the east-northeast on Monday. Tropical Storm Henri will continue to weaken as it moves inland over southern New England. Henri will continue to drop heavy rain on some locations and the risk of flash floods will continue into early next week.

Hurricane Henri Moves Toward Long Island

Hurricane Henri moved toward Long Island on Saturday night. At 11:00 p.m. EDT on Saturday the center of Hurricane Henri was located at latitude 38.6°N and longitude 71.0°W which put it about 180 miles (290 km) south-southeast of Montauk Point, New York. Henri was moving toward the north at 11 m.p.h. (22 km/h). The maximum sustained wind speed was 75 m.p.h. (120 km/h) and there were wind gusts to 90 m.p.h. (145 km/h). The minimum surface pressure was 987 mb.

A Hurricane Warning was in effect for eastern Long Island from Fire Island Inlet to Port Jefferson Harbor. A Hurricane Warning was also in effect for the portion of the coast from New Haven, Connecticut to Westport, Massachusetts. The Hurricane Warning included Block Island. A Tropical Storm Warning was in effect for the south coast of Long Island from East Rockaway Inlet to Fire Island Inlet. A Tropical Storm Warning was in effect for the north coast of Long Island from East Rockaway Inlet to Port Jefferson, Harbor. A Tropical Storm Warning was in effect for the portion of the coast from East Rockaway Inlet to New Haven, Connecticut. A Tropical Storm Warning was in effect from the portion of the coast from Westport, Massachusetts to Chatham, Massachusetts. The Tropical Storm Warning included Nantucket and Martha’s Vineyard. A Tropical Storm Warning was also in effect for the portion of the coast from East Rockaway Inlet, New York to Manasquan Inlet, New Jersey. The Tropical Storm Warning included New York City.

Hurricane Henri exhibited more organization on Saturday night but reconnaissance flights were not finding an increase in the wind speeds. A circular eye with a diameter of 30 miles (50 km) formed at the center of Henri. The eye was surrounded by a broken ring of thunderstorms and the strongest winds were occurring in that ring. Bands of showers and thunderstorms were revolving around the core of Henri. Storms near the core generated upper level divergence that pumped mass away from the hurricane. The removal of mass caused the surface pressure to decrease slowly on Saturday. Winds to hurricane force extended out 35 miles in the southeastern quadrant of Henri. The winds in the other parts of Henri were blowing at less than hurricane force. Winds to tropical storm force extended out 150 miles (240 km) from the center of circulation.

Hurricane Henri will move through an environment favorable for intensification during the next few hours. Henri will move over the Gulf Stream where the Sea Surface Temperatures are near 29°C. It will move around the eastern side of an upper level trough over the eastern U.S. The trough will produce southerly winds that will blow toward the top of Henri’s circulation. Those winds will cause some vertical wind shear, but the shear may not be enough to prevent some intensification during the next few hours. Hurricane Henri could strengthen during the next 6 hours. Henri will move over cooler water when it moves north of the Gulf Stream on Sunday and that will cause it to weaken. Some drier air could wrap around the western and southern sides of Hurricane Henri on Sunday.

The upper level trough will steer Hurricane Henri toward the north-northwest on Sunday. On its anticipated track Hurricane Henri will approach Long Island during the middle of the day on Sunday. Henri could still be a hurricane when it nears Long Island. Hurricane Henri is likely to cause minor wind damage on Long Island and in southern New England. Gusty winds and falling trees could cause widespread power outages. Henri could move more slowly when it moves across southern New England. Locally heavy rain over a prolonged period could cause flash floods. Hurricane Henri could cause a storm surge of up to 4 to 7 feet (1 to 2 meters) where the wind blows the water toward the coast.

Henri Strengthens to a Hurricane

Former Tropical Storm Henri strengthened to a hurricane on Saturday morning. At 11:00 a.m. EDT on Saturday the center of Hurricane Henri was located at latitude 34.4°N and longitude 72.5°W which put it about 180 miles (290 km) east-southeast of Cape Hatteras, North Carolina. Henri was moving toward the north-northeast at 14 m.p.h. (22 km/h). The maximum sustained wind speed was 75 m.p.h. (120 km/h) and there were wind gusts to 90 m.p.h. (145 km/h). The minimum surface pressure was 991 mb.

A Hurricane Warning was in effect for eastern Long Island from Fire Island Inlet to Port Jefferson Harbor. A Hurricane Warning was also in effect for the portion of the coast from New Haven, Connecticut to Westport, Massachusetts. The Hurricane Warning included Block Island. A Tropical Storm Warning was in effect for the south coast of Long Island from East Rockaway Inlet to Fire Island Inlet. A Tropical Storm Warning was in effect for the north coast of Long Island from East Rockaway Inlet to Port Jefferson, Harbor. A Tropical Storm Warning was in effect for the portion of the coast from East Rockaway Inlet to New Haven, Connecticut. A Tropical Storm Warning was in effect from the portion of the coast from Westport, Massachusetts to Chatham, Massachusetts. The Tropical Storm Warning included Nantucket and Martha’s Vineyard. A Tropical Storm Warning was also in effect for the portion of the coast from East Rockaway Inlet, New York to Manasquan Inlet, New Jersey. The Tropical Storm Warning included New York City.

Reconnaissance planes found that former Tropical Storm Henri has strengthened to a hurricane on Saturday morning. More thunderstorms formed near the center of Henri and the inner end of a rainband wrapped around the north side of the center of circulation. Storms near the center generated upper level divergence that pumped mass away from the hurricane. The removal of mass caused the surface pressure to decrease. Winds to hurricane force extended out 60 miles in the southeastern quadrant of Henri. The winds in the other parts of the storm were blowing at less than hurricane force. Winds to tropical storm for extended out 130 miles (210 km) from the center of circulation.

Hurricane Henri will move through an environment favorable for intensification during the next 18 hours. Henri will move over the Gulf Stream where the Sea Surface Temperatures are near 29°C. It will move around the eastern side of an upper level trough over the eastern U.S. The trough will produce southwesterly winds that will blow toward the top of Henri’s circulation. Those winds will cause some vertical wind shear, but the shear will not be enough to prevent intensification. Hurricane Henri is likely to strengthen during the next 12 hours. Henri will move over cooler water when it moves north of the Gulf Stream on Sunday and that will cause it to weaken.

The upper level trough will steer Hurricane Henri toward the north-northeast during the next 12 hours. The position and orientation of the trough will change as it interacts with Hurricane Henri. The trough will pull Henri toward the north-northwest on Sunday. On its anticipated track Hurricane Henri will approach Long Island on Sunday afternoon. Henri could be a hurricane when it nears Long Island. Hurricane Henri is likely to cause minor wind damage on Long Island and in southern New England. Gusty winds and falling trees could cause widespread power outages. Henri could move slowly when it moves across southern New England. Locally heavy rain could cause flash floods. Hurricane Henri could cause a storm surge of up to 4 to 7 feet (1 to 2 meters) where the wind blows the water toward the coast.

Elsewhere, Tropical Storm Grace was dropping heavy rain over parts of central Mexico. At 11:00 p.m. EDT on Saturday the center of Tropical Storm Grace was located at latitude 19.7°N and longitude 98.9°W which put it about 25 miles (40 km) north-northeast of Mexico City, Mexico. Grace was moving toward the west-southwest at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 70 m.p.h. (110 km/h) and there were wind gusts to 85 m.p.h. (135 km/h). The minimum surface pressure was 990 mb.

A Tropical Storm Warning was in effect for the portion of the coast from Puerto Veracruz to Barra de Tordo, Mexico.

Grace Rapidly Intensifies to a Major Hurricane

Hurricane Grace rapidly intensified to a major hurricane near Mexico on Friday night. At 11:00 p.m. EDT on Friday the center of Hurricane Grace was located at latitude 20.7°N and longitude 96.3°W which put it about 75 miles (120 km) east-southeast of Tuxpan, Mexico. Grace was moving toward the west at 10 m.p.h. (16 km/h). The maximum sustained wind speed was 120 m.p.h. (195 km/h) and there were wind gusts to 140 m.p.h. (220 km/h). The minimum surface pressure was 967 mb.

A Hurricane Warning was in effect for the portion of the coast from Puerto Veracuz to Cabo Rojo, Mexico. A Tropical Storm Warning was in effect for the portion of the coast from Cabo Rojo to Barra del Tordo, Mexico.

Hurricane Grace rapidly intensified to a major hurricane on Friday night. A circular eye with a diameter of 35 miles (55 km) was at the center of Grace. The eye was surround by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Hurricane Grace. Storms near the core generated upper level divergence that pumped mass away from the hurricane. The removal of mass caused the surface pressure to decrease, which produced a rapid increase in the surface wind speed.

Hurricane Grace was an average sized hurricane. Winds to hurricane force extended out 30 miles (50 km) from the center of Grace. Winds to tropical storm force extended out 150 miles (240 km) from the center of circulation. The Hurricane Intensity Index (HII) for Grace was 22.1. The Hurricane Size Index (HSI) was 11.2 and the Hurricane Wind Intensity Size Index (HWISI) was 33.3. Hurricane Grace was capable of regional major damage.

Hurricane Grace will move south of a high pressure system that extends over the Gulf of Mexico. The high pressure system will steer Grace toward the west during the next 24 hours. On its anticipated track the center of Hurricane Grace will make landfall on the coast of Mexico between Tuxpan and Veracruz in a few hours. Grace will be capable of causing major wind damage. It will drop locally heavy rain and flash floods are likely. Hurricane Grace could cause a storm surge of up to 10 feet (3 meters) where the wind blows the water toward the coast. Grace will weaken quickly when it moves inland over Mexico, but heavy rain could cause flash floods over parts of Central Mexico,

Elsewhere, Tropical Storm Henri was moving toward the north off the East Coast of the U.S. At 11:00 p.m. EDT on Friday the center of Tropical Storm Henri was located at latitude 32.3°N and longitude 73.5°W which put it about 230 miles (375 km) south-southeast of Cape Hatteras, North Carolina. Henri was moving toward the north at 9 m.p.h. (15 km/h). The maximum sustained wind speed was 70 m.p.h. (85 km/h) and there were wind gusts to 85 m.p.h. (135 km/h). The minimum surface pressure was 994 mb.

A Hurricane Warning was in effect for eastern Long Island from Fire Island Inlet to Port Jefferson Harbor. A Hurricane Warning was also in effect for the portion of the coast from New Haven, Connecticut to Watch Hill, Rhode Island. A Hurricane Watch was in effect from Watch Hill, Rhode Island to Sagamore Beach, Massachusetts. The Hurricane Watch included Block Island, Martha’s Vineyard and Nantucket. A Tropical Storm Warning was in effect for the south coast of Long Island from East Rockaway Inlet to Fire Island Inlet. A Tropical Storm Warning was in effect for the north coast of Long Island from East Rockaway Inlet to Port Jefferson, Harbor. A Tropical Storm Warning was in effect for the portion of the coast from East Rockaway Inlet to New Haven, Connecticut. A Tropical Storm Warning was in effect from the portion of the coast from Watch Hill, Rhode Island to Wood Hole, Massachusetts. The Tropical Storm Warning included Block Island and Martha’s Vineyard. A Tropical Storm Warning was also in effect for the portion of the coast from East Rockaway Inlet, New York to Manasquan Inlet, New Jersey. The Tropical Storm Warning included New York City.

Tropical Storm Henri Prompts Hurricane Watches for Long Island, Southeast New England

A potential threat from Tropical Storm Henri prompted the issuance of Hurricane Watches for parts of Long Island and southeastern New England on Friday morning. At 8:00 a.m. EDT on Friday the center of Tropical Storm Henri was located at latitude 30.0°N and longitude 73.7°W which put it about 375 miles (600 km) southeast of Cape Hatteras, North Carolina. Henri was moving toward the west-northwest at 9 m.p.h. (15 km/h). The maximum sustained wind speed was 65 m.p.h. (105 km/h) and there were wind gusts to 80 m.p.h. (130 km/h). The minimum surface pressure was 995 mb.

A Hurricane Watch was issued for eastern Long Island from Fire Island Inlet to Port Jefferson Harbor. A Hurricane Watch was also issued for the portion of the coast from New Haven, Connecticut to Sagamore Beach, Massachusetts. The Hurricane Watch included Block Island, Martha’s Vineyard and Nantucket. A Tropical Storm Watch was issued for the south coast of Long Island from East Rockaway Inlet to Fire Island Inlet. A Tropical Storm Watch was issued for the north coast of Long Island from East Rockaway Inlet to Port Jefferson Harbor. A Tropical Storm Watch was also issued for the portion of the coast from East Rockaway Inlet to New Haven, Connecticut.

Tropical Storm Henri did not change much during Thursday night. The distribution of thunderstorms around Henri remained asymmetrical. The strongest thunderstorms were occurring in bands in the southern half of Henri. Bands in the northern half of the circulation consisted primarily of showers and lower clouds. Henri was moving under the southeastern part of an upper level ridge off the east coast of the U.S. The ridge was producing northeasterly winds that were blowing toward the top of Henri’s circulation. Those winds were causing moderate vertical wind shear and they were also contributing to the asymmetrical distribution of thunderstorms. Winds to tropical storm force extended out 90 miles (145 km) from the center of Henri.

Although Tropical Storm Henri is currently moving toward the west-northwest, an upper level trough over the eastern U.S. will turn Henri toward the north on Friday. The trough will steer Henri toward the north on Saturday. When Henri turns toward the north it will move under the axis of the upper level ridge. The upper level winds are weaker near the axis of the ridge and the wind shear will be less. Tropical Storm Henri is likely to strengthen to a hurricane on Saturday. Henri will move over the warm water in the Gulf Stream and there is a chance that Henri could strengthen to Category 2 on the Saffir-Simpson Scale.

A high pressure system will move northeast of Henri on Sunday. The high pressure system will block Henri and prevent it from moving toward the northeast. The high pressure system will also slow the forward speed of Henri. Henri could be moving slowly when it nears Long Island and southeastern New England. A slow forward speed would increase the time period when places experience strong gusty winds, which would increase the chance for wind damage and power outages. Slow movement would also increase the total rainfall in many locations and the risk for flash floods would increase. Henri could also cause a storm surge of up to 4 to 7 feet (1 to 2 meters) along the coast.

Elsewhere, former Tropical Storm Grace strengthened back to a hurricane over the southwestern Gulf of Mexico on Friday morning. At 8:00 a.m. EDT on Friday the center of Hurricane Grace was located at latitude 20.6°N and longitude 93.7°W which put it about 185 miles (300 km) east-northeast of Veracruz, Mexico. Grace was moving toward the west at 15 m.p.h. (24 km/h). The maximum sustained wind speed was 85 m.p.h. (135 km/h) and there were wind gusts to 100 m.p.h. (160 km/h). The minimum surface pressure was 983 mb.

A Hurricane Warning was in effect for the portion of the coast from Puerto Veracuz to Cabo Rojo, Mexico. A Tropical Storm Warning was in effect for the portion of the coast from Cabo Rojo to Barra del Tordo, Mexico.