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Hurricane Grace Advisory Number 30
NWS National Hurricane Center Miami FL AL072021
400 PM CDT Fri Aug 20 2021
...GRACE CONTINUES STRENGTHENING...
...EXPECTED TO MAKE LANDFALL ALONG EASTERN MAINLAND MEXICO
SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION
ABOUT 150 MI...245 KM ESE OF TUXPAN MEXICO
ABOUT 115 MI...185 KM NE OF VERACRUZ MEXICO
MAXIMUM SUSTAINED WINDS...90 MPH...150 KM/H
PRESENT MOVEMENT...W OR 265 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...979 MB...28.91 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Hurricane Warning is in effect for...
* The coast of mainland Mexico from Puerto Veracruz to Cabo Rojo
A Tropical Storm Warning is in effect for...
* The coast of mainland Mexico from north of Cabo Rojo to Barra del
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area, in this case within 12 to 24
hours. Preparations to protect life and property should be rushed
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere withing the warning area, in this case within 12
to 24 hours.
For storm information specific to your area, please monitor
products issued by your national meteorological service.
DISCUSSION AND OUTLOOK
At 400 PM CDT (2100 UTC), the center of Hurricane Grace was located
near latitude 20.5 North, longitude 95.1 West. Grace is moving
toward the west near 10 mph (17 km/h), and this general motion is
expected to continue through landfall. On the forecast track, the
center of Grace is forecast to move across the southwestern Gulf of
Mexico this evening, and then make landfall along the coast of
mainland Mexico within the hurricane warning area tonight.
Maximum sustained winds have increased to near 90 mph (150 km/h)
with higher gusts. Strengthening is forecast until Grace makes
landfall, with rapid weakening expected as Grace moves inland over
the mountains of central Mexico.
Hurricane-force winds extend outward up to 25 miles (35 km) from the
center and tropical-storm-force winds extend outward up to 185 miles
The estimated minimum central pressure is 979 mb (28.91 inches).
HAZARDS AFFECTING LAND
Key messages for Grace can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT2, WMO header WTNT42 KNHC and
on the web at www.hurricanes.gov/graphics_at2.shtml?key_messages.
STORM SURGE: A dangerous storm surge will raise water levels by as
much as 4 to 6 ft above normal tide levels along the immediate
coast within the hurricane warning area near and north of where the
center makes landfall tonight. Near the coast, the surge will be
accompanied by large and destructive waves.
WIND: Hurricane conditions are expected within portions of the
hurricane warning area in mainland Mexico tonight, with tropical
storm conditions expected within the next few hours. Tropical
storm conditions are expected within the tropical storm warning
area in mainland Mexico by this evening.
RAINFALL: Grace is expected to produce the following rainfall
Over Veracruz, Puebla, Tlaxcala, Hidalgo, Queretaro, and eastern San
Luis Potosi...6 to 12 inches of rain with isolated maximum totals
of 18 inches are expected today through Sunday. Heavy rainfall from
Grace will result in significant flash and urban flooding as well as
SURF: High surf generated by Grace will affect the southern Gulf of
Mexico coastline today and continue into the weekend. These swells
are likely to cause life-threatening surf and rip current
conditions. Please consult products from your local weather office.
Next intermediate advisory at 700 PM CDT.
Next complete advisory at 1000 PM CDT.