Tropical Storm Isaac is a little weaker.
The storm is centered about 170 miles E of Dominica and about 185 miles ESE of Guadeloupe. It is moving toward the W at near 20 mph, and this general motion with a decrease in forward speed is expected to continue through the weekend.
On the forecast track, Isaac is forecast to move across the central Lesser Antilles and into the eastern Caribbean Sea on Thursday, and then move across the eastern and central Caribbean Sea through the weekend.
Data from a NOAA Hurricane Hunter aircraft and satellite-derived wind data indicate that the maximum sustained winds have decreased to near 45 mph with higher gusts. A gradual decrease in the winds is forecast during the next few days.
Tropical-storm-force winds extend outward up to 175 miles to the north of the center.
2 a.m. Thursday update
Location: 15.3°N 58.8°W
Moving: W at 20 mph
Min pressure: 1006 mb
Max sustained: 45 mph