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BULLETIN
Hurricane Hanna Advisory Number  12
NWS National Hurricane Center Miami FL       AL082020
400 PM CDT Sat Jul 25 2020
 
...HANNA STRENGTHENS SOME MORE AS IT NEARS THE TEXAS COAST...
...HURRICANE CONDITIONS OCCURRING ON PORTIONS OF PADRE ISLAND...
 
 
SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...26.8N 97.2W
ABOUT 20 MI...30 KM NE OF PORT MANSFIELD TEXAS
ABOUT 70 MI...115 KM S OF CORPUS CHRISTI TEXAS
MAXIMUM SUSTAINED WINDS...90 MPH...150 KM/H
PRESENT MOVEMENT...WSW OR 255 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...973 MB...28.74 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
The Hurricane Warning has been replaced by a Tropical Storm Warning
north of Port Aransas, Texas.
 
The Tropical Storm Warning has been discontinued north of Port
O'Connor, Texas.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Storm Surge Warning is in effect for...
* Port Mansfield to Sargent Texas
 
A Hurricane Warning is in effect for...
* Port Mansfield to Port Aransas Texas
 
A Tropical Storm Warning is in effect for...
* Barra el Mezquital Mexico to Port Mansfield Texas
* Port Aransas to Port O'Connor 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 occurring
within the warning area. Preparations to protect life and property
should have already been completed.
 
A Tropical Storm Warning means that tropical storm conditions are
occurring within the warning areas.
 
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 hurricane.
 
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 400 PM CDT (2100 UTC), the center of Hurricane Hanna was located 
near latitude 26.8 North, longitude 97.2 West. Hanna is moving 
toward the west-southwest near 8 mph (13 km/h) and this motion is 
expected to continue through Sunday. On the forecast track, the 
center of Hanna should make landfall along the Texas coast within 
the hurricane warning area later this afternoon or early this 
evening. After landfall, the center of Hanna will move inland over 
south Texas tonight and move into northeastern Mexico on Sunday. 
 
Maximum sustained winds are near 90 mph (150 km/h) with higher 
gusts. Some slight strengthening is still possible before Hanna 
makes landfall in a few hours. Rapid weakening is expected after 
Hanna moves inland.
 
Hurricane-force winds extend outward up to 30 miles (45 km) from the 
center and tropical-storm-force winds extend outward up to 90 miles 
(150 km). A TCOON observation station at Laguna Madre, Texas, 
recently reported a sustained wind of 64 mph (104 km/h) and a gust 
to 76 mph (122 km/h).
 
The estimated minimum central pressure is 973 mb (28.74 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Hanna can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT3, WMO header WTNT43 KNHC and
on the web at www.hurricanes.gov/text/MIATCDAT3.shtml.
 
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 Port Aransas including Corpus Christi Bay...4-6 ft
 
Port Mansfield to Baffin Bay...2-4 ft
 
North of Port Aransas to Sargent including Copano Bay , Aransas
Bay, San Antonio Bay, and Matagorda Bay...2-4 ft
 
Mouth of the Rio Grande to Port Mansfield...1-3 ft
 
North of Sargent to High Island including Galveston Bay...1-2 ft
 
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 will continue in portions of the 
warning area through this evening.  Tropical storm conditions are 
occuring in portions of the tropical storm warning area and will 
spread inland through this evening.
 
RAINFALL:  Hanna is expected to produce total rain accumulations of
6 to 12 inches, with isolated maximum amounts of 18 inches through
Monday in south Texas and into the Mexican states of Coahuila,
Nuevo Leon, and northern Tamaulipas.  This rain will produce
life-threatening flash flooding, rapid rises on small streams, and
isolated minor to moderate river flooding.
 
Hanna is also expected to produce 3 to 5 inches of rain along the
upper Texas and Louisiana coasts.
 
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
office.
 
TORNADOES:  A few tornadoes are possible this afternoon and
overnight over parts of the lower to middle Texas coastal plain.
 
 
NEXT ADVISORY
-------------
Next intermediate advisory at 700 PM CDT.
Next complete advisory at 1000 PM CDT.
 
$$
Forecaster Stewart
 
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