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Tropical Storm Grace Intermediate Advisory Number 4A
NWS National Hurricane Center Miami FL AL072021
800 AM AST Sat Aug 14 2021
...GRACE MOVING QUICKLY WESTWARD TOWARD THE LEEWARD ISLANDS...
SUMMARY OF 800 AM AST...1200 UTC...INFORMATION
ABOUT 355 MI...570 KM ESE OF THE LEEWARD ISLANDS
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...W OR 280 DEGREES AT 22 MPH...35 KM/H
MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The government of Antigua and Barbuda has issued a Tropical Storm
Warning for the British Virgin Islands.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* Antigua and Barbuda, Anguilla, St. Kitts and Nevis, and Montserrat
* Saba and Sint Eustatius
* Sint Maarten
* St. Martin and St. Barthelemy
* British Virgin Islands
* U.S. Virgin Islands
* Puerto Rico, including Vieques and Culebra
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.
Interests in the Dominican Republic and Haiti should monitor the
progress of this system. Additional watches and warnings will
likely be required for this area later today.
For storm information specific to your area in the United
States, including possible inland watches and warnings, please
monitor products issued by your local National Weather Service
forecast office. For storm information specific to your area
outside of the United States, please monitor products issued by
your national meteorological service.
DISCUSSION AND OUTLOOK
At 800 AM AST (1200 UTC), the center of Tropical Storm Grace was
located near latitude 15.9 North, longitude 56.6 West. Grace is
moving toward the west near 22 mph (35 km/h). A motion toward the
west with a gradual decrease in forward speed is expected during the
next few days. On the forecast track, the center of the storm is
forecast to move over the Leeward Islands tonight, over the Virgin
Islands and Puerto Rico on Sunday, and then over the Dominican
Republic on Monday.
Maximum sustained winds are near 40 mph (65 km/h) with higher
gusts. Some strengthening is forecast during the next couple of
days. Weakening is expected early next week as the system interacts
with the Greater Antilles.
Grace is a small tropical storm. Tropical-storm-force winds extend
outward up to 25 miles (35 km) from the center.
The estimated minimum central pressure is 1007 mb (29.74 inches).
HAZARDS AFFECTING LAND
Key messages for Tropical Storm Grace can be found in the Tropical
Cyclone Discussion under AWIPS header MIATCDAT2 and WMO header
WTNT42 KNHC and on the web at
WIND: Tropical storm conditions are expected within the warning
area over the Leeward Islands by tonight or early Sunday, and the
Virgin Islands and Puerto Rico beginning on Sunday.
RAINFALL: The system is expected to produce the following rainfall
amounts later today into Monday:
Over the northern Leeward Islands and Virgin Islands...3 to 6
inches. This rainfall may produce scattered areas of flash and urban
Over Puerto Rico...3 to 6 inches. Heavy rainfall could lead to
flash, urban, and small stream flooding as well as potential
Heavy rainfall from this system could impact Florida late next week.
Next complete advisory at 1100 AM AST.