At 11 a.m. the centre of Tropical Storm Isaac was located by a NOAA Hurricane Hunter aircraft near latitude 15.0 North, longitude 54.7 West. Isaac is moving toward the west near 17 miles per hour (28 km/h), and this general motion with some decrease in forward is expected to continue through the weekend.
All watches and warnings that had been issued on neighboring islands were canceled Thursday.
Isaac weakened into a tropical storm Monday and by Tuesday recorded maximum sustained winds of 70 miles per hour. This rainfall may cause unsafe flash flooding.
"Gradual weakening is forecast over the next couple of days, and Helene is expected to become a tropical storm on Thursday".
The storm is now around 530 miles southeast of Cape Fear, North Carolina, and is moving west-northwest at 17 mph.
Tropical Storm Isaac made its closest approach to St. Croix Thursday night, passing nearly 200 miles to the south and having no apparent impact on the territory as it made its leisurely way across the Caribbean. Rainfall of 0.5 to 1.5 inches with isolated amounts to 3 inches are forecast across Puerto Rico and the southern United States Virgin Islands, with up to an inch anticipated across the remaining Windward and Leeward Islands.
"Current indications are that (ex-) tropical storm Helene will approach Ireland's south coast during Tuesday".
And finally, the NHC says that swells generated by Isaac will begin to affect portions of the Lesser Antilles on Wednesday afternoon. Florence has 130 miles per hour winds, enough to make it a unsafe Category 4 hurricane.
Forecasters said Isaac could bring as many as 10 inches of rain to some locations, 2 to 4 feet of storm surge, and life-threatening surf conditions.
In contrast, no coastal watches or warnings were in effect for Helene, but residents of the Azores were encouraged to monitor the storm.