Tag Archives: Tropical Storm Tammy

Tropical Storm Tammy Moves Away From Bermuda

Tropical Storm Tammy moved away from Bermuda on Saturday. At 11:00 a.m. EDT on Saturday the center of Tropical Storm Tammy was located at latitude 33.3°N and longitude 58.7°W which put it about 360 miles (580 km) east-northeast of Bermuda. Tammy was moving toward the east 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 985 mb.

Tropical Storm Tammy weakened on Saturday as it moved under the southern extent of the upper level westerlies in the middle latitudes. The upper level westerly winds blew toward the top of Tammy’s circulation and they also caused strong vertical wind shear. The wind shear caused the distribution of thunderstorms in Tropical Storm Tammy to become asymmetrical. Thunderstorms were occurring in bands in the eastern side of Tammy’s circulation. Bands in the western half of Tropical Storm Tammy consisted primarily of showers and lower clouds. Winds to tropical storm force extended out 140 miles (220 km) from the center of Tammy’s circulation.

Tropical Storm Tammy will move through an environment that will be unfavorable for intensification during the next 24 hours. Tammy will move over water where the Sea Surface Temperatures are near 25°C. The upper level westerly winds will continue to cause strong vertical wind shear. The combination of marginal Sea Surface Temperatures and strong vertical wind shear will continue to create an environment unfavorable for intensification during the next 24 hours.

Tropical Storm Tammy will move around the northern side of a high pressure system over the eastern Atlantic Ocean. The high pressure system will steer Tammy toward the east during the next 24 hours. On its anticipated track, Tropical Storm Tammy will move farther away from Bermuda.

Tammy Makes a Transition Back to a Tropical Storm

Former Hurricane Tammy made a transition back to a tropical storm east of Bermuda on Friday morning. At 11:00 a.m. EDT on Friday the center of Tropical Storm Tammy was located at latitude 32.2°N and longitude 61.1°W which put it about 215 miles (350 km) east of Bermuda. Tammy was moving toward the northwest at 3 m.p.h. (5 km/h). The maximum sustained wind speed was 65 m.p.h. (95 km/h) and there were wind gusts to 80 m.p.h. (130 km/h). The minimum surface pressure was 988 mb.

Former Hurricane Tammy made a transition from an extratropical cyclone back to a tropical storm east of Bermuda on Friday morning. The circulation of Tropical Storm Tammy became separated from the occluded front that had formed on Thursday. More thunderstorms formed near the center of Tammy’s circulation. The circulation became more symmetrical and it had the appearance of a tropical storm on visible satellite images. Based on the changes in the circulation’s structure, the U.S. National Hurricane Center designated Tammy as a tropical storm again.

Bands of showers and thunderstorms were revolving around the center of Tropical Storm Tammy. Storms near the center generated upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 205 miles (335 km) in the northern side of Tammy’s circulation. Winds to tropical storm force extended out 90 miles in the southern side of the circulation.

Tropical Storm Tammy will be in an environment somewhat favorable for intensification during the next 24 hours. Tammy will move over water where the Sea Surface Temperatures are near 26°C. It will be in a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Storm Tammy could intensify back to a hurricane during the next 24 hours.

Tropical Storm Tammy will be in an area where the steering level winds are weak during the next 12 hours. Tammy could meander east of Bermuda during the rest of Friday. A high pressure system centered southeast of Bermuda will steer Tropical Storm Tammy toward the east during the weekend. On its anticipated track, Tropical Storm Tammy will move away from Bermuda during the weekend.

Tropical Storm Tammy Strengthens East of the Lesser Antilles

Tropical Storm Tammy strengthened east of the Lesser Antilles on Thursday morning. At 8:00 a.m. EDT on Thursday the center of Tropical Storm Tammy was located at latitude 13.5°N and longitude 55.1°W which put it about 465 miles (745 km) east of Guadeloupe. Tammy was moving toward the west at 16 m.p.h. (26 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 1004 mb.

Tropical Storm Watches were in effect for Barbados, Dominica, Martinique, Guadeloupe, Antigua, Barbuda, Montserrat, St. Kitts, Nevis, Saba, St. Eustatius.

A NOAA research plane found that Tropical Storm Tammy had strengthened during Wednesday night. More thunderstorms developed near the center of Tammy’s circulation. However, the distribution of thunderstorms was still asymmetrical. Many of the thunderstorms were occurring in bands in the eastern side of Tropical Storm Tammy. Bands in the western side of Tammy’s circulation consisted primarily of showers and lower clouds. Storms near the center of circulation generated upper level divergence that pumped mass away to the north and east of the tropical storm. Winds to tropical storm force extended out 140 miles (220 km) in the eastern side of Tropical Storm Tammy. Winds to tropical storm force extended out 70 miles (110 km) in the western side of Tammy.

Tropical Storm Tammy will move through an environment somewhat favorable for intensification during the next 24 hours. Tammy will move over water where the Sea Surface Temperatures are near 30°C. It will move under the far eastern part of an upper level low over the Eastern Caribbean Sea. The upper level low will produce southwesterly winds that will blow toward the top of Tammy’s circulation. The winds in the lower levels of the atmosphere are blowing from the east. The difference in wind direction between the upper and lower levels of the atmosphere will cause moderate vertical wind shear. The wind shear will inhibit intensification. Tropical Storm Tammy could intensify gradually during the next 24 hours.

Tropical Storm Tammy will move south of a subtropical high pressure system over the Atlantic Ocean. The high pressure system will steer Tammy toward the west-northwest during the next 24 hours. On its anticipated track, Tropical Storm Tammy could approach the central and northern Leeward Islands on Friday.

Tropical Storm Tammy is likely to bring gusty winds and locally heavy rain to the central and northern Leeward Islands. Heavy rain is likely to cause flash in some locations. Tropical Storm Tammy could cause a storm surge of up to seven feet (two meters) along the coasts of some of the islands.

Tropical Storm Tammy Forms East of the Lesser Antilles

Tropical Storm Tammy formed over the Atlantic Ocean east of the Lesser Antilles on Wednesday afternoon. At 5:00 p.m. EDT on Wednesday the center of Tropical Storm Tammy was located at latitude 13.0°N and longitude 51.7°W which put it about 625 miles (1005 km) east of the Lesser Antilles. Tammy was moving toward the west at 23 m.p.h. (37 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 1007 mb.

Tropical Storm Watches were issued for Barbados, Dominica, Martinique and Guadeloupe.

A low pressure system over the Atlantic Ocean east of the Lesser Antilles strengthened on Wednesday afternoon and the U.S. National Hurricane Center designated the system as Tropical Storm Tammy. The circulation around Tropical Storm Tammy was not well organized. Many of the thunderstorms were occurring in bands in the eastern part of Tammy’s circulation. Bands in the western part of Tropical Storm Tammy consisted primarily of showers and lower clouds. Storms near the center of Tammy’s circulation were beginning to generate upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 140 miles (220 km) in the northeastern quadrant of Tropical Storm Tammy. The winds in the other parts of Tammy were blowing at less than tropical storm force.

Tropical Storm Tammy will move through an environment somewhat favorable for intensification during the next 24 hours. Tammy will move over water where the Sea Surface Temperatures are near 30°C. It will move under the far eastern part of an upper level low over the Eastern Caribbean Sea. The upper level low will produce southwesterly winds that will blow toward the top of Tammy’s circulation. The winds in the lower levels of the atmosphere are blowing from the east. The difference in wind direction between the upper and lower levels of the atmosphere will cause moderate vertical wind shear. The wind shear will inhibit intensification. Tropical Storm Tammy could intensify a little during the next 24 hours, if the winds in the lower levels weaken. However, if the winds in the lower levels get stronger, then Tammy could weaken to a tropical depression.

Tropical Storm Tammy will move south of a subtropical high pressure system over the Atlantic Ocean. The high pressure system will steer Tammy toward the west-northwest during the next 24 hours. On its anticipated track, Tropical Storm Tammy could be near Barbados in 36 hours.

Tropical Storm Tammy is likely to bring gusty winds and locally heavy rain to Barbados, Dominica, Martinique and Guadeloupe. Heavy rain is likely to cause flash in some locations.