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Tropical Storm Grace Intermediate Advisory Number 9A
NWS National Hurricane Center Miami FL AL072021
200 PM AST Sun Aug 15 2021
...GRACE BRINGING LOCALLY HEAVY RAINS TO PUERTO RICO AND THE
...NOAA HURRICANE HUNTERS CURRENTLY INVESTIGATING GRACE...
SUMMARY OF 200 PM AST...1800 UTC...INFORMATION
ABOUT 145 MI...90 KM SSW OF SAN JUAN PUERTO RICO
ABOUT 220 MI...355 KM ESE OF SANTO DOMINGO DOMINICAN REPUBLIC
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:
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 meteorological service.
DISCUSSION AND OUTLOOK
At 200 PM AST (1800 UTC), the center of Tropical Storm Grace was
located near latitude 17.3 North, longitude 66.8 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. On the forecast track, Grace will move over
Hispaniola on Monday, near or over eastern Cuba on Tuesday, and
near or over west-central Cuba on Wednesday.
Maximum sustained winds are near 40 mph (65 km/h) with higher
gusts. Some strengthening is possible until Grace moves over
Hispaniola on Monday. Weakening is forecast while the system
crosses Hispaniola Monday and Monday night. Some restrengthening
could occur if the center moves back over water 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: The system is expected to produce the following rainfall
amounts today into Tuesday:
Virgin Islands...3 to 6 inches. This rainfall may produce
scattered areas of flash and urban flooding.
Over Puerto Rico...3 to 6 inches, with isolated higher amounts.
Heavy rainfall could lead to flash, urban and small stream flooding
and possible mudslides.
Over Haiti and the Dominican Republic...4 to 8 inches with isolated
maximum totals of 15 inches across southern terrain areas. 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.
SURF: Swells generated by Grace will continue to affect portions
of the Leeward Islands, the Virgin Islands and Puerto Rico and will
reach portions of Hispaniola tonight and Monday. 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 500 PM AST.