Tropical Storm Isaac Intermediate Advisory Number 19A
NWS National Hurricane Center Miami FL AL092018
800 AM AST Wed Sep 12 2018
...NOAA HURRICANE HUNTER APPROACHING ISAAC...
SUMMARY OF 800 AM AST...1200 UTC...INFORMATION
ABOUT 450 MI...725 KM E OF MARTINIQUE
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...W OR 270 DEGREES AT 15 MPH...24 KM/H
MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
A Tropical Storm Watch is in effect for...
* St. Kitts and Nevis
* Saba and St. Eustatius
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, in this case within 36 to 48 hours.
Interests elsewhere in the Leeward Islands should monitor the
progress of Isaac.
For storm information specific to your area, please monitor
products issued by your national meteorological service.
DISCUSSION AND OUTLOOK
At 800 AM AST (1200 UTC), the center of Tropical Storm Isaac was
located near latitude 14.5 North, longitude 54.1 West. Isaac is
moving toward the west near 15 mph (24 km/h), and this general
motion is expected to continue through the weekend. On the forecast
track, Isaac's center is forecast to move across the central Lesser
Antilles and into the eastern Caribbean Sea on Thursday, and into
the central Caribbean Sea on Saturday.
Maximum sustained winds remain near 60 mph (95 km/h) with higher
gusts. Gradual weakening is forecast during the next few days. A
NOAA hurricane hunter aircraft will soon fly through the center
of Isaac, and will provide a better assessment of the intensity of
the tropical storm and the extent of its winds.
Tropical-storm-force winds extend outward up to 105 miles (165 km)
from the center.
The estimated minimum central pressure is 1000 mb (29.53 inches).
HAZARDS AFFECTING LAND
RAINFALL: Isaac is expected to produce total rainfall accumulations
of 2 to 4 inches with isolated amounts up to 8 inches across
Martinique, Dominica, and Guadeloupe, with up to one inch
anticipated across the remaining Windward and Leeward Islands.
WIND: Tropical storm conditions are expected on Martinique,
Dominica, and Guadeloupe by tonight or early Thursday. Tropical
storm conditions are possible within the tropical storm watch area
STORM SURGE: Some coastal flooding is possible in areas of onshore
winds. Near the coast, the surge will be accompanied by large
SURF: Swells generated by Isaac will begin to affect portions
of the Lesser Antilles this afternoon. These swells are likely to
cause life-threatening surf and rip current conditions. Please
consult products from your local weather office.
Next complete advisory at 1100 AM AST.