FLORENCE
At 500 AM AST (0900 UTC), the centre of Tropical Storm Florence was located near latitude 24.5 North, longitude 55.8 West. Florence is
moving toward the west near 6 mph (9 km/h), and this general motion is expected to continue today. A west-northwestward motion with an increase in forward speed is expected by Monday, and that motion is forecast to continue through mid-week. On the forecast track, the
centre of Florence will move over the southwestern Atlantic Ocean between Bermuda and the Bahamas Tuesday and Wednesday, and approach the southeastern U.S. coast on Thursday.
Maximum sustained winds are near 70 mph (110 km/h) with higher gusts. Florence is expected to become a hurricane today and rapid
intensification is likely to begin by tonight. Florence is forecast to become a major hurricane on Monday.
Tropical-storm-force winds extend outward up to 125 miles (205 km)
from the centre.
HELENE
At 500 AM AST (0900 UTC), the centre of Tropical Storm Helene was located near latitude 13.2 North, longitude 24.0 West. Helene is moving toward the west near 14 mph (22 km/h), and this motion is expected to continue through today. A turn toward the west-northwest is forecast to occur by Monday.
Maximum sustained winds have increased to near 65 mph (100 km/h) with higher gusts. Additional strengthening is forecast during the next couple of days, and Helene is expected to become a hurricane later today.
Tropical-storm-force winds extend outward up to 80 miles (130 km) from the centre.
ISAAC
At 500 AM AST (0900 UTC), the centre of Tropical Storm Isaac was located near latitude 14.5 North, longitude 38.1 West. Isaac is moving toward the west near 9 mph (15 km/h). A westward motion with an increase in forward speed is expected during the next few days.
Maximum sustained winds remain near 50 mph (85 km/h) with higher gusts. Strengthening is forecast during the next few days, and Isaac is expected to become a hurricane by Monday.
Tropical-storm-force winds extend outward up to 60 miles (95 km) from the centre.
1. A weak area of low pressure located near Bermuda is producing disorganized showers and thunderstorms. Significant development of
this system is not expected due to strong upper-level winds. This system is expected to move little during the next couple of days.
* Formation chance through 48 hours…low…10 percent.
* Formation chance through 5 days…low…10 percent.
2. A non-tropical area of low pressure is forecast to form in the northeastern Atlantic Ocean several hundred miles west-southwest of the Azores in a few days. Some slow tropical or subtropical development is possible by the middle of the week while the low meanders.
* Formation chance through 48 hours…low…near 0 percent.
* Formation chance through 5 days…low…30 percent.