Monthly Archives: September 2022

Tropical Storm Muifa Forms Southeast of the Ryukyu Islands

Tropical Storm Muifa formed over the Western North Pacific Ocean southeast of the Ryukyu Islands on Wednesday night. At 11:00 p.m. EDT on Wednesday the center of Tropical Storm Muifa was located at latitude 17.2°N and longitude 132.6°E which put it about 730 miles (1175 km) south-southeast of Okinawa. Muifa was moving toward the west at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h). The minimum surface pressure was 997 mb.

The circulation around a low pressure system southeast of the Ryukyu Islands exhibited more organization on Wednesday night and the Japan Meteorological Agency designated the system as Tropical Storm Muifa. The distribution of thunderstorms around Tropical Storm Muifa was asymmetrical. Most of the thunderstorms were occurring in bands in the western side of Muifa’s circulation. Bands in the eastern side of Muifa consisted primarily of showers and lower clouds. Storms west of the center of circulation generated upper level divergence that pumped mass away to the west of the tropical storm. Winds to tropical storm force extended out 100 miles (160 km) from the center of circulation.

Tropical Storm Muifa will move through an environment favorable for intensification during the next 24 hours. Muifa will move over water where the Sea Surface Temperatures are near 30˚C. It will move under the southern part of an upper level ridge over the Western North Pacific Ocean. The ridge will produce easterly winds that will blow toward the top of Muifa’s circulation. Those winds will cause some vertical wind shear, but the wind shear will not be strong enough to prevent intensification. Tropical Storm Muifa will intensify during the next 48 hours. Muifa could strengthen to a typhoon in 24 hours. Muifa could intensify to the equivalent of a major hurricane in 48 hours.

Tropical Storm Muifa will move around the southwestern part of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Muifa toward the northwest during the next 48 hours. On its anticipated track Tropical Storm Muifa could approach the southern Ryukyu Islands in 72 hours. Muifa is likely to be a typhoon when it approaches the southern Ryukyu Islands.

Bermuda Issues Hurricane Watch for Hurricane Earl

The government of Bermuda issued a Hurricane Watch on Wednesday afternoon because of the potential effects of Hurricane Earl. At 5:00 p.m. EDT on Wednesday the center of Hurricane Earl was located at latitude 26.5°N and longitude 65.5°W which put it about 405 miles (650 km) south of Bermuda. Earl was moving toward the north at 8 m.p.h. (13 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 974 mb.

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

Hurricane Earl exhibited more organization on Thursday afternoon. An circular eye with a diameter of 18 miles (30 km) was at the center of Earl’s circulation. The eye was surrounded by a partial ring of thunderstorms. Thunderstorms surrounded the northern half of the eye. Bands of showers and thunderstorms were revolving around the more organized core of Hurricane Earl. Storms near the center of Earl generated upper level divergence that pumped mass away from the hurricane.

The circulation around Hurricane Earl increased in size on Thursday. Winds to hurricane force extended out 45 miles (75 km) from the center of Earl’s circulation. Winds to tropical storm force extended out 150 miles (240 km) from the center. The Hurricane Intensity Index (HII) for Hurricane Earl was 12.7. The Hurricane Size Index (HSI) was 14.8 and the Hurricane Wind Intensity Size Index (HWISI) was 27.5.

Hurricane Earl will move through an environment favorable for intensification during the next 36 hours. Earl 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 Earl will intensify during the next 36 hours. After an inner core with a fully formed eye and eyewall develops, Earl could intensify rapidly. Hurricane Earl could strengthen to a major hurricane within 36 hours.

Hurricane Earl will move around the western end of a high pressure system over the Atlantic Ocean. The high pressure system will steer Earl toward the north during the next 12 hours. An upper level trough near the East Coast of the U.S. will turn Hurricane Earl toward the northeast on Thursday. On its anticipated track, the center of Hurricane Earl will pass southeast of Bermuda on Thursday evening. Bands in the western side of Hurricane Earl could bring strong winds and locally heavy rain to Bermuda.

Elsewhere over the Atlantic Ocean, Hurricane Danielle maintained hurricane intensity northwest of the Azores. At 5:00 p.m. EDT on Wednesday the center of Hurricane Danielle was located at latitude 44.9°N and longitude 34.9°W which put it about 625 miles (1010 km) northwest of the Azores. Danielle was moving toward the northeast at 16 m.p.h. (26 km/h). The maximum sustained wind speed was 80 m.p.h. (130 km/h) and there were wind gusts to 95 m.p.h. (150 km/h). The minimum surface pressure was 972 mb.

Hurricane Kay Strengthens to Cat. 2

Hurricane Kay strengthened to Category 2 on the Saffir-Simpson Scale over the Eastern North Pacific Ocean southwest of Baja California on Wednesday morning. At 8:00 a.m. EDT on Wednesday the center of Hurricane Kay was located at latitude 20.6°N and longitude 112.3°W which put it about 220 miles (355 km) southwest of the southern tip of Baja California. Kay was moving toward the north-northwest at 12 m.p.h. (19 km/h). The maximum sustained wind speed was 100 m.p.h. (160 km/h) and there were wind gusts to 120 m.p.h. (195 km/h). The minimum surface pressure was 975 mb.

A Hurricane Warning was in effect for the portion of the coast from Punta Abreojos to San Jose De Las Palmas, Mexico. A Hurricane Watch was in effect for the portion of the coast from Punta Abreojos to Puerto Cortes, Mexico. A Tropical Storm Warning was in effect for the portion of the coast from Punta Abreojos to Bahia De Los Angeles, Mexico. The Tropical Storm Warning included Cabo San Lucas. A Tropical Storm Watch was in effect for the portion of the coast from Bahia De Los Angeles to San Felipe, Mexico. A Tropical Storm Watch was in effect for the portion of the coast from San Jose De Las Palmas to Cabo San Quintin, Mexico.

Hurricane Kay continue to strengthen on Wednesday morning. A circular eye was present at the center of Kay’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 Kay. Storms near the core generated upper level divergence that pumped mass away from the hurricane in all directions.

The circulation around Hurricane Kay was large. Winds to hurricane force extended out 30 miles (50 km) from the center of Kay’s circulation. Winds to tropical storm force extended out 230 miles (370 km) from the center. The Hurricane Intensity Index (HII) for Hurricane Kay was 16.5. The Hurricane Size Index (HSI) was 11.3 and the Hurricane Wind Intensity Size Index (HWISI) was 27.8. Kay was capable of causing regional serious damage.

Hurricane Kay will move through an environment favorable for intensification during the next 18 hours. Kay will move over water where the Sea Surface Temperatures are near 28˚C. It will move through a region where the upper level winds are weak and there will be little wind shear. Hurricane Kay will intensify during the next 18 hours. Kay could strengthen to a major hurricane.

Hurricane Kay will move around the southwestern part of a high pressure system over Mexico. The high pressure system will steer Kay toward the north-northwest during the next 24 hours. On its anticipated track, Hurricane Kay will approach the west coast of Baja California south of Punta Eugenia on Thursday morning. Kay will bring strong winds to the portion of the coast near Punta Eugenia. Bands on the eastern side of Hurricane Kay will drop locally heavy rain over much of Baja California. Heavy rain is likely to cause flash floods in some locations. Widespread outages of electricity could occur in Baja California.

Kay Causes Hurricane Watch for Baja California

A potential risk posed by Hurricane Kay caused the government of Mexico to issue a Hurricane Watch for a portion of the coast of Baja California. At 5:00 p.m. EDT on Tuesday the center of Hurricane Kay was located at latitude 18.8°N and longitude 111.0°W which put it about 290 miles (470 km) south-southwest of the southern tip of Baja California. Kay was moving toward the northwest 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 978 mb.

A Hurricane Watch was in effect for the portion of the coast from Puerto Cortes to Punta Eugenia, Mexico. A Tropical Storm Warning was in effect for the portion of the coast from Punta Abreojos to Santa Rosalia, Mexico. The Tropical Storm Warning included Cabo San Lucas. A Tropical Storm Watch was in effect for the portion of the coast from Santa Rosalia to Bahia De Los Angeles, Mexico. A Tropical Storm Watch was in effect for the portion of the coast from Punta Eugenia to San Jose De Las Palmas, Mexico.

Hurricane Kay strengthened slowly on Tuesday afternoon. An eye appeared intermittently at the center of Kay’s circulation. A partial ring of thunderstorms surrounded the eye. The strongest storms were in the southeastern part of the ring and that was where the strongest winds were occurring. Most of the thunderstorms were in bands in the southern half of Hurricane Kay. Bands in the northern half of the circulation consisted primarily of showers and lower clouds. Storms near the center of Kay’s circulation generated upper level divergence that pumped mass away to the south and west of the hurricane. Winds to hurricane force extended out 30 miles (50 km) from the center of Kay. Winds to tropical storm force extended out 200 miles (320 km) from the center of circulation.

Hurricane Kay will move through an environment favorable for intensification during the next 36 hours. Kay will move over water where the Sea Surface Temperatures are near 29˚C. It will move under the southern part of an upper level ridge centered over the Southwest U.S. The upper level ridge will produce northerly winds that will blow toward the top of Kay’s circulation. Those winds will cause some vertical wind shear. The wind shear will slow the rate of intensification, but Hurricane Kay is likely to strengthen during the next 24 hours. Kay will move closer to the axis of the ridge later on Wednesday. The upper level winds are weaker near the axis of the ridge and the wind shear will decrease. Hurricane Kay will intensify faster when the wind shear decreases. Kay could strengthen to a major hurricane, when the wind shear decreases.

Hurricane Kay will move around the southwestern part of a high pressure system over Mexico. The high pressure system will steer Kay toward the north-northwest during the next 36 hours. On its anticipated track, Hurricane Kay will approach the west coast of Baja California south of Punta Eugenia on Thursday morning. Kay could bring strong winds and locally heavy rain to Baja California. Heavy rain could cause flash floods in some locations.

Tropical Storm Earl Prompts Watch for Bermuda

A potential risk posed by Tropical Storm Earl prompted the issuance of a Tropical Storm Watch for Bermuda on Tuesday afternoon. At 5:00 p.m. EDT on Tuesday the center of Tropical Storm Earl was located at latitude 24.1°N and longitude 65.8°W which put it about 570 miles (915 km) south of Bermuda. Earl was moving toward the north-northwest at 5 m.p.h. (8 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 994 mb.

A Tropical Storm Watch was in effect for Bermuda.

Tropical Storm Earl was close to strengthening to a hurricane on Tuesday afternoon. The inner end of a rainband wrapped around the eastern half of the center of circulation. An eye appeared to be forming at the center of Earl’s circulation. Bands of thunderstorms were located in the eastern and northern parts of Tropical Storm Earl. Bands in the southern and western parts of the circulation still consisted primarily of showers and lower clouds. Storms near the center of circulation generated upper level divergence that pumped mass away to the northeast of the tropical storm. Winds to tropical storm force extended out 125 miles (200 km) from the center of Earl.

Tropical Storm Earl will move through an environment favorable for intensification during the next 48 hours. Earl will move over water where the Sea Surface Temperatures are near 29˚C. An upper level low southwest of Bermuda will produce southwesterly winds that will blow toward the top of Earl’s circulation. Those winds will cause vertical wind shear. The wind shear will inhibit intensification, but Tropical Storm Earl could continue to intensify slowly. The upper level winds are forecast to weaken later on Wednesday, and Earl is likely to intensify to a major hurricane after that happens.

Tropical Storm Earl will move around the western end of a high pressure system over the Atlantic Ocean. The high pressure system will steer Earl toward the north during the next 48 hours. On its anticipated track, Tropical Storm Earl will approach Bermuda on Thursday afternoon. Earl will be a hurricane when it approaches Bermuda.

Elsewhere over the Atlantic Ocean, Hurricane Danielle was moving toward the east-northeast west of the Azores. At 5:00 p.m. EDT on Tuesday the center of Hurricane Danielle was located at latitude 42.5°N and longitude 40.3°W which put it about 765 miles (1230 km) west-northwest of the Azores. Danielle was moving toward the east-northeast at 7 m.p.h. (11 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 986 mb.

Kay Strengthens to a Hurricane Southwest of Mexico

Former Tropical Storm Kay strengthened to a hurricane over the Eastern North Pacific Ocean southwest of Mexico on Monday afternoon. At 5:00 a.m. EDT on Monday the center of Hurricane Kay was located at latitude 15.6°N and longitude 107.3°W which put it about 305 miles (495 km) southwest of Manzanillo, Mexico. Kay was moving toward the west-northwest at 10 m.p.h. (16 km/h). The maximum sustained wind speed was 80 m.p.h. (130 km/h) and there were wind gusts to 95 m.p.h. (150 km/h). The minimum surface pressure was 981 mb.

The government of Mexico issued a Tropical Storm Watch for the portion of the coast from Loreto to Puerto San Andresito.

Former Tropical Storm Kay intensified rapidly to a hurricane on Monday afternoon. The inner end of a rainband wrapped completely the center of Kay’s circulation. An eye formed at the center of Hurricane Kay. The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms. Other bands of showers and thunderstorms were revolving around the center of Kay’s circulation. Storms near the center of circulation generated upper level divergence that pumped mass away from the hurricane. Winds to hurricane force extended out 25 miles (40 km) in the northeastern quadrant of Hurricane Kay. Winds to tropical storm force extended out 175 miles (280 km) from the center of circulation.

Hurricane Kay will move through an environment favorable for intensification during the next 36 hours. Kay 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 Kay will intensify during the next 36 hours. Kay could strengthen to a major hurricane.

Hurricane Kay will move around the southwestern part of a high pressure system over Mexico. The high pressure system will steer Kay toward the northwest during the next 36 hours. On its anticipated track, Hurricane Kay will move parallel to the west coast of Mexico. Kay could approach Baja California on Wednesday.

Typhoon Hinnamnor Brings Wind and Rain to South Korea

Typhoon Hinnamnor brought strong gusty winds and heavy rain to South Korea on Monday. At 5:00 p.m. EDT on Monday the center of Typhoon Hinnamnor was located at latitude 35.7°N and longitude 129.2°E which put it about 80 miles (130 km) southwest of Busan, South Korea. Hinnamnor was moving toward the north-northeast at 25 m.p.h. (40 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 964 mb.

Typhoon Hinnamnor was a large, powerful typhoon when it began to affect South Korea. Winds to typhoon force extended out 45 miles (75 km) from the center of Hinnamnor. Winds to tropical storm force extended out 280 miles (455 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Hinnamnor was 17.8. The hurricane Size Index (HSI) was 22.8 and the Hurricane Wind Intensity Size Index (HWISI) was 40.6. Typhoon Hinnamnor was capable of causing widespread serious damage.

Typhoon Hinnamnor will move quickly toward the north-northeast across southeastern South Korea during the next few hours. The strongest winds will occur southeast of a line from Busan to Pohang. Hinnamnor will drop heavy rain over much of South Korea. Heavy rain could cause flash floods in some locations.

Typhoon Hinnamnor will move into an environment unfavorable for a tropical cyclone during the next 24 hours. Hinnamor will move over water where the Sea Surface Temperatures are near 24˚C. It will move under the eastern side of an upper level trough over China. The trough will produce strong southwesterly winds that will blow toward the top of Hinnamnor’s circulation. Typhoon Hinnamnor is likely to make a transition to an extratropical cyclone as it moves over the Sea of Japan during the next 24 hours.

Tropical Storm Earl Intensifies North of the Virgin Islands

Tropical Storm Earl intensified north of the Virgin Islands on Monday morning. At 11:00 a.m. EDT on Monday the center of Tropical Storm Earl was located at latitude 21.5°N and longitude 65.3°W which put it about 215 miles (345 km) north-northwest of St. Thomas. Earl was moving toward the north-northwest at 5 m.p.h. (8 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 998 mb.

A NOAA Hurricane Hunter plane found that Tropical Storm Earl had intensified during a reconnaissance flight on Monday morning. Even though the circulation around Tropical Storm Earl was stronger, the distribution of thunderstorms was still asymmetrical. Most of the thunderstorms were occurring in bands in the eastern side of Earl’s circulation. Bands in the western half of the circulation consisted primarily of showers and lower clouds. Storms in the eastern half of Earl generated upper level divergence that pumped mass away to the east of the tropical storm. Winds to tropical storm force extended out 100 miles (160 km) from the center of Earl’s circulation.

Tropical Storm Earl will move through an environment favorable for intensification during the next 48 hours. Earl will move over water where the Sea Surface Temperatures are near 29˚C. It will move under the eastern side of an upper level trough near the Bahamas. The upper level trough will produce southwesterly winds that will blow toward the top of Ear;’s circulation. Those winds will cause vertical wind shear. The wind shear will inhibit intensification, but Tropical Storm Earl could continue to intensify slowly. The upper level winds are forecast to weaken in a day or so, and Earl is likely to intensify to a hurricane when that happens.

Tropical Storm Earl will move around the western end of a high pressure system over the Atlantic Ocean. The high pressure system will steer Earl toward the north during the next 48 hours. On its anticipated track, Tropical Storm Earl will move farther away from the Virgin Islands and Puerto Rico. Earl could approach Bermuda by the end of the week.

Elsewhere over the Atlantic Ocean, Hurricane Danielle started to weaken west of the Azores. At 11:00 a.m. EDT on Monday the center of Hurricane Danielle was located at latitude 40.2°N and longitude 43.9°W which put it about 915 miles (1475 km) west-northwest of the Azores. Danielle was moving toward the north-northeast at 8 m.p.h. (13 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 976 mb.

Tropical Storm Kay Prompts Watch for Southern Baja California

A potential risk posed by Tropical Storm Kay prompted the government of Mexico to issue a Tropical Storm Watch for the coast of southern Baja California on Monday morning. At 11:00 a.m. EDT on Monday the center of Tropical Storm Kay was located at latitude 15.8°N and longitude 106.4°W which put it about 260 miles (420 km) south-southwest of Manzanillo, Mexico. Kay was moving toward the west at 15 m.p.h. (24 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 995 mb.

The government of Mexico issued a Tropical Storm Watch for the portion of the coast from Loreto to Puerto San Andresito.

Tropical Storm Kay strengthened on Monday morning. The inner end of a rainband wrapped around the southern and eastern sides of the center of Kay’s circulation. Other bands of showers and thunderstorms were revolving around the developing core of Tropical Storm Kay. Storms near the center of circulation generated upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 200 miles (320 km) in the northern side of Kay. Winds to tropical storm force extended out 100 miles (160 km) in the southern half of the circulation.

Tropical Storm Kay will move through an environment favorable for intensification during the next 36 hours. Kay 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. Tropical Storm Kay will intensify during the next 36 hours. Kay could strengthen to a hurricane within 24 hours. It could intensify more rapidly after an eye and an eyewall form.

Tropical Storm Kay will move around the southwestern part of a high pressure system over Mexico. The high pressure system will steer Kay toward the northwest during the next 36 hours. On its anticipated track, Tropical Storm Kay will move parallel to the west coast of Mexico. Kay could approach Baja California on Wednesday.

Hurricane Danielle Starts to Move Northeast

Hurricane Danielle started to move toward the northeast on Sunday night. At 11:00 p.m. EDT on Sunday the center of Hurricane Danielle was located at latitude 39.0°N and longitude 44.7°W which put it about 955 miles (1540 km) west of the Azores. Danielle was moving toward the northeast at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 90 m.p.h. (145 km/h) and there were wind gusts to 105 m.p.h. (165 km/h). The minimum surface pressure was 975 mb.

After being nearly stationary over the North Atlantic west of the Azores during much of the weekend, Hurricane Danielle finally started to move toward the northeast on Sunday night. Danielle strengthened on Sunday. A circular eye with a diameter of 30 miles (50 km) was at the center of Hurricane Danielle. The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Danielle’s circulation. Winds to hurricane force extended out 25 miles (40 km) from the center of Danielle. Winds to tropical storm force extended out 115 miles (185 km) from the center of circulation.

Hurricane Danielle will move through an environment capable of supporting a hurricane during the next 24 hours. Danielle will move over water where the Sea Surface Temperatures are near 27˚C. It will move through a region where the upper level winds are weak on Monday and there will be little vertical wind shear. Hurricane Danielle could get a little stronger during the next 24 hours. An upper level trough over the North Atlantic Ocean will approach Danielle from the west on later on Monday. The upper level trough will produce southwesterly winds that will cause the vertical wind shear to increase. Danielle will move over cooler water on Tuesday. The combination of more vertical wind shear and cooler water will cause Hurricane Danielle to begin a transition to an extratropical cyclone.

The upper level trough over the North Atlantic Ocean will steer Hurricane Danielle toward the northeast during the next several days. On its anticipated track Hurricane Danielle will pass north of the Azores later this week. Danielle could eventually affect the weather in Western Europe as an extratropical cyclone.

Elsewhere over the Atlantic Ocean, Tropical Storm Earl was spinning north of the Virgin Islands. At 11:00 p.m. EDT on Sunday the center of Tropical Storm Earl was located at latitude 20.2°N and longitude 65.4°W which put it about 125 miles (200 km) north-northwest of St. Thomas. Earl was moving toward the northwest at 3 m.p.h. (5 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 998 mb.