Tag Archives: Grand Cayman

Ian Intensifies to a Hurricane, Watch Issued for Tampa

Former Tropical Storm Ian intensified to a hurricane during Sunday night and a Hurricane Watch was issued for the area around Tampa, Florida. At 8:00 a.m. EDT on Monday the center of Hurricane Ian was located at latitude 18.7°N and longitude 82.4°W which put it about 90 miles (145 km) west-southwest of Grand Cayman. Ian was moving toward the northwest 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 981 mb.

Hurricane Warnings were in effect for Grand Cayman and for the Cuban provinces of Isla Juventud, Pinar del Rio and Artemisa. A Hurricane Watch was in effect for the portion of the coast from Anclote River to Englewood, Florida. The Hurricane Watch included Tampa Bay. Tropical Storm Warnings were in effect for the Lower Florida Keys from Seven Mile Bridge to Key West including the Dry Tortugas. Tropical Storm Warnings were also in effect for the Cuban provinces of La Habana, Mayabeque and Matanzas. A Tropical Storm Watch was in effect for the portion of the coast from Englewood to Chokoloskee, Florida. Tropical Storm Watches were also in effect for Little Cayman and Cayman Brac.

Former Tropical Storm Ian rapidly intensified to a hurricane during Sunday night. An eye was forming at the center of Ian’s circulation. The developing eye was surrounded by ring of thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the center of Hurricane Ian. Storms near the center of circulation generated strong upper level divergence that pumped large quantities of mass away from the tropical storm. The removal of mass was allowing the surface pressure to decrease rapidly. Winds to hurricane force extended out 20 miles (30 km) in the northeastern quadrant of Hurricane Ian. Winds to tropical storm force extended out 90 miles (145 km) from the center of Ian’ circulation.

Hurricane Ian will move through an environment very favorable for intensification during the next 36 hours. Ian will move over water where the Sea Surface Temperatures are near 30˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Hurricane Ian is likely to intensify rapidly during the next 36 hours. Ian is likely to intensify to a major hurricane during the next 24 hours. Hurricane Ian could intensify to Category 4 on the Saffir-Simpson Scale by Wednesday.

Hurricane Ian will move around the western end of a high pressure system over the western Atlantic Ocean. The high pressure system will steer Ian toward the northwest during the next 12 hours. Ian will move toward the north when it reaches the western end of the high pressure system. On its anticipated track the center of Hurricane Ian will pass west of Grand Cayman on Monday afternoon. Ian could be near western Cuba on Tuesday morning. Hurricane Ian could be a major hurricane when it approaches western Cuba. Ian could be southwest of Tampa, Florida on Wednesday afternoon.

Hurricane Ian will bring strong winds and locally heavy rain to western Cuba. Ian will be capable of causing regional major damage in western Cuba. Widespread outages of electricity are likely. Heavy rain could cause flash floods in some locations.

The steering currents could weaken on Wednesday. If the steering currents weaken, the the area around Tampa and St. Petersburg could experience a prolonged period of strong winds even if the center of Hurricane Ian moves west of Tampa. When the center of Ian is west of Tampa, the winds will blow from the south in the area around Tampa. Southerly winds will push water into Tampa Bay and a storm surge of 5 to 8 feet (1.5 to 2.5 meters) is possible.

Tropical Storm Ian Passes South of Jamaica

Tropical Storm Ian passed south of Jamaica on Saturday night. At 11:00 p.m. EDT on Saturday the center of Tropical Storm Ian was located at latitude 14.7°N and longitude 77.7°W which put it about 395 miles (630 km) southeast of Grand Cayman. Ian was moving toward the west at 13 m.p.h. (20 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 1002 mb.

A Hurricane Warning was in effect for Grand Cayman. Hurricane Watches were in effect for the Cuban provinces of Isla de Juventud, Pinar del Rio and Artemisa. Tropical Storm Watches were in effect for Little Cayman and Cayman Brac. Tropical Storm Watches were also in effect for the Cuban provinces of La Habana, Mayabeque and Matanzas.

Tropical Storm Ian gradually got better organized on Saturday. More thunderstorms developed near the center of circulation. Bands of showers and thunderstorms formed and began to revolve around the center of Ian’s circulation. Storms near the center generated upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 60 miles (95 km) in the northern side of Ian. The winds in the southern half of Tropical Storm Ian were blowing at less than tropical storm force.

Tropical Storm Ian will move through an environment very favorable for intensification during the next 48 hours. Ian will move over water where the Sea Surface Temperatures are near 30˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Storm Ian is likely to intensify more quickly on Sunday. Tropical Storm Ian is likely to intensify to a hurricane during the next 24 hours. Ian could intensify rapidly after an inner core with an eye and an eyewall form. Ian could intensify to a major hurricane within 48 hours.

Tropical Storm Ian will move around the western end of a high pressure system over the western Atlantic Ocean. The high pressure system will steer Ian toward the northwest during the next 36 hours. On its anticipated track Tropical Storm Ian could be near Grand Cayman on Monday morning. Ian could be near western Cuba on Tuesday morning. Ian could be a major hurricane when it approaches western Cuba. Ian will move over the eastern Gulf of Mexico on Wednesday.

Elsewhere over the Atlantic Ocean, Tropical Storm Gaston brought wind and rain to the western Azores and Tropical Depression Hermine was weakening north-northeast of the Cabo Verde Islands.

At 11:00 p.m. EDT on Saturday the center of Tropical Storm Gaston was located at latitude 38.6°N and longitude 33.4°W which put it about 255 miles (410 km) west of the Faial, Azores. Gaston was moving toward the west at 12 m.p.h. (19 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 9979 mb.

Tropical Storm Warnings were in effect for Corvo, and Flores.

At 11:00 p.m. EDT on Saturday the center of Tropical Depression Hermine was located at latitude 22.9°N and longitude 20.3°W which put it about 535 miles (860 km) north-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 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.

Eta Strengthens Back to Tropical Storm, Warnings Issued for Florida

Former Tropical Depression Eta strengthened back to a tropical storm on Saturday morning and Tropical Storm Warnings for parts of South Florida and the Florida Keys. At 1:00 p.m. EST on Saturday the center of Tropical Storm Eta was located at latitude 20.0°N and longitude 80.1°W which put it about 50 miles (80 km) north of Grand Cayman Island. Eta was moving toward the northeast at 17 m.p.h. (28 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.

A Tropical Storm Warning was issued for the portion of the coast from Golden Beack to Chokoloskee, Florida. A Tropical Storm Warning was issued for the Florida Keys from Ocean Reef to the Dry Tortugas. Tropical Storm Warnings were in effect for the Cayman Islands and the Cuban provinces of Camaguey, Ciego de Avila, Sancti Spiritus, Villa Clara, Cienfuegos and Matanzas. A Tropical Storm Warning was in effect for the Northwestern Bahamas including the Abacos, Andros Island, the Berry Islands, Bimini, Eleuthera, Grand Bahama Island and New Providence. Tropical Storm Watches were issued for the portion of the coast from Chokoloskee to Englewood, Florida and from JGolden Beach to the Brevard/Volusia County Line. A Tropical Storm Watch was in effect for Lake Okeechobee. A Tropical Storm Watch was in effect for the Cuban provinces of La Habana, Artemisa y Mayabeque, Pinar del Rio and the Isle of Youth.

Observations from a U.S. Air Force Reserve Hurricane Hunter plane and from Grand Cayman Island indicated that the center of former Tropical Depression Eta reformed in a cluster of thunderstorms near Grand Cayman. The reconnaissance plane was still sampling the circulation around Tropical Storm Eta but the available date suggested that it was much better organized. The inner end of a rainband was wrapping around the eastern and northern part of the center of circulation. Other bands of showers and thunderstorms were revolving around the core of Eta. Storms near the core were generating upper level divergence which was pumping mass away to the northeast of the tropical storm. The removal of mass was allowing the surface pressure to decrease and Tropical Storm Eta was intensifying more quickly. Winds to tropical storm force extended out 60 miles (95 km) from the center of Eta.

Tropical Storm Eta will move through an environment favorable for intensification during the next 12 to 18 hours. Eta will move over water where the Sea Surface Temperature is near 29°C. It will initially be under an upper level ridge where the winds are weaker. There will be less vertical wind shear under the ridge. Eta could intensify rapidly during the next 12 hours and it could strengthen to a hurricane. Eta is likely to weaken when it crosses Cuba on Saturday night . The Sea Surface Temperature of the water north of Cuba is near 29°C. So, Eta is likely to strengthen after it crosses Cuba. Eta could strengthen to a hurricane when it approaches South Florida. An upper level low over the western Gulf of Mexico will produce southwesterly winds which will blow toward the top of Eta on Sunday. Those winds will cause more vertical wind shear, which could limit further intensification of Eta. The wind shear caused by the upper low could eventually cause Eta to develop a structure more like a subtropical cyclone.

An upper low over the western Gulf of Mexico will be the primary feature steering Eta. Counterclockwise rotation around the cutoff low will pull Eta more toward the northeast on Saturday. On its anticipated track Eta could move across Cuba on Saturday night and it could drop heavy rain when it does so. The upper low will steer Eta toward the northwest on Sunday. Eta will approach South Florida and the Florida Keys on Sunday night. It could be a hurricane at that time. Eta will bring gusty winds and locally heavy rain to the Florida Keys and South Florida. A high pressure system over the Atlantic Ocean will interact with the circulation around the northern side of Eta to produce strong easterly winds which will blow toward the coast of Southeast Florida. Those winds will push water toward the coast and the water level could rise up to six feet (2 meters).