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Tropical Storm Hanna Intermediate Advisory Number 9A
NWS National Hurricane Center Miami FL AL082020
100 AM CDT Sat Jul 25 2020
...HANNA LIKELY TO MAKE LANDFALL AS A HURRICANE IN SOUTHERN TEXAS...
SUMMARY OF 100 AM CDT...0600 UTC...INFORMATION
ABOUT 140 MI...225 KM ESE OF CORPUS CHRISTI TEXAS
ABOUT 130 MI...215 KM ENE OF PORT MANSFIELD TEXAS
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...W OR 270 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...991 MB...29.26 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Baffin Bay to Sargent Texas
A Hurricane Warning is in effect for...
* Port Mansfield to Mesquite Bay Texas
A Tropical Storm Warning is in effect for...
* Barra el Mezquital Mexico to Port Mansfield Texas
* Mesquite Bay to High Island Texas
A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 24 hours in the indicated locations. For a
depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov. This is a life-threatening situation. Persons
located within these areas should take all necessary actions to
protect life and property from rising water and the potential for
other dangerous conditions. Promptly follow evacuation and other
instructions from local officials.
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area, in this case within the next 24
hours. Preparations to protect life and property should be rushed
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within
the next 24 hours.
Interests elsewhere along the Texas and Louisiana coasts should
monitor the progress of Hanna. Interests in northeastern Mexico
should also monitor the progress of this system.
For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.
DISCUSSION AND OUTLOOK
At 100 AM CDT (0600 UTC), the center of Tropical Storm Hanna was
located near latitude 27.0 North, longitude 95.3 West. Hanna is
moving toward the west near 8 mph (13 km/h) and this motion should
continue through this morning. A gradual turn toward the
west-southwest is expected by tonight and that motion should
continue through Sunday. On the forecast track, the center of Hanna
should make landfall along the Texas coast within the hurricane
warning area this afternoon or early this evening.
Maximum sustained winds are near 65 mph (100 km/h) with higher
gusts. Additional strengthening is forecast, and Hanna is expected
to become a hurricane before the cyclone makes landfall today.
Rapid weakening is expected after Hanna moves inland.
Tropical-storm-force winds extend outward up to 80 miles (130 km)
from the center.
The estimated minimum central pressure is 991 mb (29.26 inches).
HAZARDS AFFECTING LAND
Key messages for Hanna can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC.
STORM SURGE: The combination of a dangerous storm surge and the
tide will cause normally dry areas near the coast to be flooded by
rising waters moving inland from the shoreline. The water could
reach the following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide...
Baffin Bay to Sargent TX...including Corpus Christi Bay, Copano Bay,
Aransas Bay, San Antonio Bay, and Matagorda Bay...3 to 5 ft
Mouth of the Rio Grande to Baffin Bay TX...1 to 3 ft
North of Sargent to High Island TX...including Galveston Bay...1 to
The deepest water will occur along the immediate coast near and to
the right of the landfall location. Surge-related flooding depends
on the relative timing of the surge and the tidal cycle, and can
vary greatly over short distances. For information specific to your
area, please see products issued by your local National Weather
Service forecast office.
WIND: Hurricane conditions are expected in the warning area
this afternoon. Tropical storm conditions are expected to begin
in the warning area later this morning.
RAINFALL: Hanna is expected to produce 5 to 10 inches of rain with
isolated maximum totals of 15 inches through Sunday night in south
Texas and into the Mexican states of Coahuila, Nuevo Leon, and
northern Tamaulipas. This rain may result in life-threatening flash
flooding, rapid rises on small streams, and isolated minor to
moderate river flooding in south Texas.
Along the upper Texas and Louisiana coasts 3 to 5 inches of rain is
SURF: Swells generated by Hanna are expected to increase and affect
much of the Texas and Louisiana coasts during the next couple of
days. These swells are likely to cause life-threatening surf and rip
current conditions. Please consult products from your local weather
TORNADOES: A brief tornado or two will be possible across portions
of the Texas coast, beginning this morning.
Next complete advisory at 400 AM CDT.