At 500 PM AST (2100 UTC), the center of Tropical Storm Isaac was
located near latitude 15.3 North, longitude 68.2 West. Isaac is
moving toward the west near 14 mph (22 km/h), and this general
motion with some decrease in forward speed is anticipated over the
next couple of days with a turn to the west-northwest possible by
late Sunday. On the forecast track, Isaac will move over the
eastern and central Caribbean Sea during the next few days, and be
near or south of Jamaica early next week.
NOAA Hurricane Hunter data indicate that maximum sustained winds
have increased to near 40 mph (65 km/h) with higher gusts.
Little change in strength is forecast during the next 36 hours.
Isaac is forecast to become a tropical depression on Sunday and
degenerate into a wave on Monday. However this is an uncertain
Tropical-storm-force winds extend outward up to 45 miles (75 km)
from the center.
The estimated minimum central pressure from dropsonde data is 1002
mb (29.59 inches).
HAZARDS AFFECTING LAND
RAINFALL: Isaac is expected to produce additional rainfall of 2 to
3 inches with isolated maximum totals of up to 5 inches across
southeast Puerto Rico. Rainfall totals of 1 to 2 inches with
maximum amounts of 3 inches are possible across the remainder of
Puerto Rico, the Virgin Islands, the Leeward Islands and the
northern Windward Islands. Rainfall totals of 2 to 3 inches with
isolated maximum amounts of 4 inches are possible across the south-
central portion of the Dominican Republic, southwest Haiti and most
of Jamaica except for the eastern portion of Jamaica where rainfall
totals of 2 to 4 inches and maximum amounts of 6 inches are
possible. This rainfall may cause life-threatening flash floods.