Tropical Storm Florence reorganized southeast of Bermuda on Saturday. At 11:00 p.m. EDT on Saturday the center of Tropical Storm Florence was located at latitude 24.6°N and longitude 55.2°W which put it about 790 miles (1270 km) southeast of Bermuda. Florence was moving toward the west at 6 m.p.h. (10 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 989 mb.
Vertical wind shear decreased around Tropical Storm Florence and the circulation showed evidence of better organization. Stronger thunderstorms developed near the center of circulation and a primary rainband wrapped about three quarters of the way around the center. An eye appeared to be forming. Thunderstorms near the center generated more upper level divergence which pumped away mass and the surface pressure decreased on Saturday. More thunderstorms also developed in other rainbands that were revolving around the core of the circulation. Tropical Storm Florence appeared to be on the threshold of regaining hurricane intensity.
Tropical Storm Florence will be moving through an environment favorable for intensification during the next two or three days. Florence will move over water where the Sea Surface Temperature is near 29°C. It will move into a region where the upper level winds are weaker and there will be less vertical wind shear. Tropical Storm Florence will intensify back into a hurricane on Sunday. It could intensify rapidly once a eye and complete eyewall form. Florence is likely to become a major hurricane by early next week.
Tropical Storm Florence will move near the western end of a subtropical high pressure system over the western Atlantic Ocean. The high will steer Florence in a general west-northwesterly direction during the next few days. On its anticipated track Florence could approach the southeast coast of the U.S. by Thursday. It is likely to be a major hurricane at that time. The steering currents could weaken when Florence approaches the U.S. and it is too early to make a precise forecast of landfall.
Elsewhere, Tropical Storms Helene and Isaac strengthened over the eastern tropical Atlantic Ocean. At 11:00 p.m. EDT on Saturday the center of Tropical Storm Helene was located at latitude 13.2°N and longitude 22.8°W which put it about 155 miles (250 km) southeast of the Cabo Verde Islands. Helene was moving toward the west at 13 m.p.h. (20 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. (120km/h). The minimum surface pressure was 999 mb. Tropical Storm Warnings were in effect for Santiago, Fogo and Brava.
At 11:00 p.m. EDT the center of Tropical Storm Isaac was located at latitude 14.4°N and longitude 37.5°W which put it about 1580 miles (2540 km) east of the Windward Islands. Isaac was moving toward the west at 8 m.p.h. (13 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.