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Tropical Storm Grace Intermediate Advisory Number 8A
NWS National Hurricane Center Miami FL AL072021
800 AM AST Sun Aug 15 2021
...DISORGANIZED GRACE CONTINUES MOVING WEST-NORTHWESTWARD OVER THE
NORTHEASTERN CARIBBEAN SEA...
SUMMARY OF 800 AM AST...1200 UTC...INFORMATION
ABOUT 55 MI...90 KM SW OF ST. CROIX
ABOUT 100 MI...160 KM SSE OF SAN JUAN PUERTO RICO
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...WNW OR 285 DEGREES AT 16 MPH...26 KM/H
MINIMUM CENTRAL PRESSURE...1010 MB...29.83 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The Tropical Storm Warnings for Saba and Sint Eustatius have been
The Tropical Storm Warnings for St. Martin and St. Barthelemy have
The Tropical Storm Warning for Sint Maarten has been discontinued.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* U.S. Virgin Islands
* Puerto Rico, including Vieques and Culebra
* Dominican Republic from the southern Haitian border to Samana
A Tropical Storm Watch is in effect for...
* North coast of the Dominican Republic from the Haitian border to
* Entire coast of Haiti
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, generally within 48 hours.
Interests elsewhere in the the Turks and Caicos Islands, the
southeastern Bahamas, and Cuba should monitor the progress of Grace.
Additional watches and warnings could be required for some of these
areas 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
DISCUSSION AND OUTLOOK
At 800 AM AST (1200 UTC), the center of Tropical Storm Grace was
located near latitude 17.1 North, longitude 65.4 West. Grace is
moving toward the west-northwest near 16 mph (26 km/h). A continued
west-northwestward motion at a slower forward speed is expected over
the next few days.
Maximum sustained winds are near 40 mph (65 km/h) with higher
gusts. Some strengthening is expected before Grace reaches
Hispaniola on Monday. Weakening is forecast as the system crosses
Hispaniola Monday and Monday night. Little change in strength is
expected on Tuesday.
Tropical-storm-force winds extend outward up to 35 miles (55 km)
from the center.
The estimated minimum central pressure is 1010 mb (29.83 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 portions of
the warning areas in the U.S. Virgin Islands and Puerto Rico today,
and in the Dominican Republic tonight and Monday. Tropical storm
conditions are possible within the watch area in the Dominican
Republic Monday, and in Haiti on Monday night.
RAINFALL: Grace is expected to produce the following rainfall
amounts Sunday 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...3 to 6 inches with isolated maximum totals of 8
inches. Heavy rainfall could lead to flash, urban and small stream
flooding and possible mudslides.
Over Haiti and the Dominican Republic...4 to 7 inches with isolated
maximum totals of 10 inches. Heavy rainfall could lead to flash and
urban flooding and possible mudslides from Monday into Tuesday.
By mid to late week, heavy rainfall from this system could impact
portions of Cuba, the Bahamas and Florida.
Next complete advisory at 1100 AM AST.