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Hurricane Grace Intermediate Advisory Number 24A
NWS National Hurricane Center Miami FL       AL072021
700 AM CDT Thu Aug 19 2021
 
...GRACE MOVING INLAND OVER THE YUCATAN PENINSULA...
...STRONG WINDS AND HEAVY RAIN WILL CONTINUE THERE TODAY...
 
 
SUMMARY OF 700 AM CDT...1200 UTC...INFORMATION
----------------------------------------------
LOCATION...20.1N 87.9W
ABOUT 45 MI...70 KM SSE OF VALLADOLID MEXICO
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...W OR 280 DEGREES AT 17 MPH...28 KM/H
MINIMUM CENTRAL PRESSURE...989 MB...29.20 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Hurricane Warning is in effect for...
* Yucatan Peninsula of Mexico from Cancun to Punta Herrero,
including Cozumel
 
A Hurricane Watch is in effect for...
* The coast of mainland Mexico from Puerto Veracruz to Cabo Rojo
 
A Tropical Storm Warning is in effect for...
* Yucatan Peninsula of Mexico from north of Cancun to Campeche
* Yucatan Peninsula of Mexico from south of Punta Herrero to Puerto
Costa Maya
 
A Tropical Storm Watch is in effect for...
* Southern coast Cuban province of Pinar del Rio, as well as Isla
de la Juventud
* The coast of mainland Mexico north of Cabo Rojo to Puerto de
Altamira
 
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area.  A warning is typically issued
36 hours before the anticipated first occurrence of tropical-storm-
force winds, conditions that make outside preparations difficult or
dangerous.  Preparations to protect life and property should be
rushed to completion.
 
A Hurricane Watch means that hurricane conditions are possible
within the watch area.  A watch is typically issued 48 hours
before the anticipated first occurrence of tropical-storm-force
winds, conditions that make outside preparations difficult or
dangerous.  A hurricane warning will likely be required for
portions of the Watch area later this morning or afternoon.
 
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.
 
Interests elsewhere in eastern mainland Mexico should monitor the
progress of Grace.
 
For storm information specific to your area, please monitor
products issued by your national meteorological service.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 700 AM CDT (1200 UTC), the center of Hurricane Grace was located
near latitude 20.1 North, longitude 87.9 West. Grace is moving
toward the west near 17 mph (28 km/h). A general westward to west-
northwestward motion is expected through Friday, followed by a
general westward to west-southwestward motion. On the forecast
track, Grace is expected to move across the Yucatan Peninsula 
today, and move over the southwest Gulf of Mexico late tonight 
through Friday. The hurricane will likely make a second landfall on 
the mainland coast of Mexico late Friday or early Saturday.
 
Maximum sustained winds have decreased to 75 mph (120 km/h) with 
higher gusts.  Grace is expected to continue to weaken as it crosses
Yucatan, but re-intensification is expected when the center reaches
the Gulf of Mexico. Grace is expected to be a hurricane when it 
makes its second landfall on the mainland coast of Mexico.
 
Hurricane-force winds extend outward up to 35 miles (55 km) from
the center and tropical-storm-force winds extend outward up to 140
miles (220 km). A Weatherflow station located 
at Cancun, Mexico, recently measured a gust to 67 mph (108 km/h) 
and another Weatherflow site at Xcaret measured a gust to 57 mph 
(92 km/h). The Cancun Airport reported a gust to 60 mph (97 km/h).
 
The estimated minimum central pressure is 989 mb (29.20 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.
 
WIND:  Hurricane conditions are expected to continue within the 
warning area in the Yucatan Peninsula of Mexico during the next 
hour or two and are spreading inland. Tropical storm conditions 
will continue this morning along the coast and will spread across 
the rest of the northern Yucatan Peninsula today. Hurricane 
conditions are possible in the hurricane watch area in mainland 
Mexico by late Friday, and tropical storm conditions are possible 
in the tropical storm watch area in mainland Mexico by late Friday. 
Tropical storm conditions are possible along the southern coast of 
Cuba within the watch area for the next several hours.
 
RAINFALL:
Grace is expected to produce the following rainfall amounts:
 
Over north-central portions of the Yucatan Peninsula... 4 to 8
inches of rain with isolated maximum totals of 12 inches are
expected through Friday. Heavy rainfall from Grace will likely
result in areas of flash and urban flooding.
 
Over central to northern Veracruz, northern Puebla and into
Hidalgo... 5 to 10 inches of rain with isolated maximum totals of 15
inches are expected from Friday through Sunday. Heavy rainfall from
Grace will likely result in areas of flash and urban flooding, and
will also be capable of producing mudslides.
 
STORM SURGE:  A dangerous storm surge will raise water levels by as 
much as 3 to 5 ft above normal tide levels along the immediate coast 
near and to the north of where the center made landfall in the 
northeastern Yucatan Peninsula, and along the eastern mainland coast 
of Mexico Friday night or early Saturday. Near the coast, the surge 
will be accompanied by large and destructive waves.
 
SURF:  Swells generated by Grace will spread westward from Jamaica
and the Cayman Islands to the southern coast of Cuba and the Yucatan
Peninsula of Mexico through today.  These swells are likely to
cause life-threatening surf and rip current conditions.  Please
consult products from your local weather office.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 1000 AM CDT.
 
$$
Forecaster Zelinsky
 
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