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Tropical Storm Grace Intermediate Advisory Number 5A
NWS National Hurricane Center Miami FL AL072021
200 PM AST Sat Aug 14 2021
...NOAA HURRICANE HUNTER AIRCRAFT CURRENTLY INVESTIGATING GRACE...
...GRACE NOT VERY WELL ORGANIZED BUT PRODUCING TROPICAL-STORM-FORCE
SUMMARY OF 200 PM AST...1800 UTC...INFORMATION
ABOUT 185 MI...345 KM ESE OF THE LEEWARD ISLANDS
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...W OR 280 DEGREES AT 23 MPH...37 KM/H
MINIMUM CENTRAL PRESSURE...1007 MB...29.77 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
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 Watch is in effect for...
* South coast of the Dominican Republic from Punta Caucedo to Cabo
* North coast of the Dominican Republic from Cabo Frances Viejo to
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, generally within 48 hours.
Interests elsewhere in the Dominican Republic, Haiti, the Turks and
Caicos Islands, and the southeastern Bahamas should monitor the
progress of Grace. Additional watches and warnings will likely be
required for this area later today and tonight.
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
DISCUSSION AND OUTLOOK
At 200 PM AST (1800 UTC), the center of Tropical Storm Grace was
estimated by extrapolation near latitude 16.2 North, longitude 58.7
West. Preliminary reports from a NOAA Hurricane Hunter aircraft
indicate that the center may be located farther to the southwest,
and a relocation could be required in the 500 PM AST advisory.
Grace is moving toward the west near 23 mph (37 km/h). A motion
toward the west-northwest with a gradual decrease in forward speed
is expected during the next several days. On the forecast track,
the center of Grace is expected to move over the Leeward Islands
tonight, over the Virgin Islands and Puerto Rico on Sunday, over
the Dominican Republic on Monday, and then between the southeastern
Bahamas and Cuba on Tuesday.
Maximum sustained winds are near 45 mph (75 km/h) with higher
gusts. Some strengthening is forecast during the next day or so.
Grace is likely to weaken while it moves near and across the Greater
Antilles Sunday night through Monday night.
Tropical-storm-force winds extend outward up to 35 miles (55 km)
from the center.
The estimated minimum central pressure is 1007 mb (29.77 inches).
HAZARDS AFFECTING LAND
Key messages for 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 in the Leeward Islands by tonight or early Sunday, and in the
Virgin Islands and Puerto Rico beginning on Sunday. Tropical storm
conditions are possible within the watch area in the Dominican
Republic Sunday night into Monday.
RAINFALL: Grace is expected to produce the following rainfall
amounts Saturday into Tuesday:
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 and the Dominican Republic...3 to 6 inches with
isolated maximum totals of 8 inches. Heavy rainfall could lead to
flash, urban, and small stream flooding as well as potential
By mid to late next week heavy rainfall from this system could
impact portions of Cuba, the Bahamas, and Florida.
Next complete advisory at 500 PM AST.