ZCZC MIATCPAT3 ALL
TTAA00 KNHC DDHHMM CCB
Hurricane Hanna Intermediate Advisory Number 13A...Corrected
NWS National Hurricane Center Miami FL AL082020
100 AM CDT Sun Jul 26 2020
Corrected to discontinue part of the Storm Surge Warnng
...HANNA WEAKENS TO A TROPICAL STORM OVER SOUTHERN TEXAS...
SUMMARY OF 100 AM CDT...0600 UTC...INFORMATION
ABOUT 30 MI...50 KM NW OF MCALLEN TEXAS
MAXIMUM SUSTAINED WINDS...70 MPH...115 KM/H
PRESENT MOVEMENT...WSW OR 250 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...983 MB...29.03 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The Hurricane Warning has been changed to a Tropical Storm Warning
along the Texas coast from Port Mansfield to Baffin Bay.
The Storm Surge Warning has been discontinued along the Texas coast
from Port Aransas to Port O'Connor.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Port Mansfield to Port Aransas
A Tropical Storm Warning is in effect for...
* Barra el Mezquital Mexico 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
A Tropical Storm Warning means that tropical storm conditions are
occurring within the warning areas.
Interests elsewhere along the Texas coast should monitor the
progress of Hanna. Interests in northeastern Mexico should also
monitor the progress of this tropical storm.
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 26.5 North, longitude 98.5 West. Hanna is
moving toward the west-southwest near 9 mph (15 km/h) and this
motion is expected to continue through Sunday. On the forecast
track, the center of Hanna should continue to move farther inland
over southern Texas this morning and move into northeastern Mexico
Maximum sustained winds have decreased to near 70 mph (115 km/h)
with higher gusts. Rapid weakening is expected today as Hanna moves
Tropical-storm-force winds extend outward up to 105 miles (165 km)
from the center. A Texas Mesonet Station northeast of Edcouch,
Texas, recently reported a sustained wind of 48 mph (77 km/h) and a
wind gust of 68 mph (109 km/h).
The estimated minimum central pressure is 983 mb (29.03 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 Baffin Bay, Corpus Christi
Port Mansfield to Baffin Bay...2-4 ft
Port Aransas to Port O'Connor including Aransas Bay...2-4 ft
Mouth of the Rio Grande to Port Mansfield...1-3 ft
North of Port O'Connor to High Island including Galveston Bay...1-2
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: Tropical storm conditions are occuring in portions of the
tropical storm warning area and will spread farther inland
overnight and Sunday.
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 2 to 4 inches of rain along the
upper Texas and Louisiana coasts.
SURF: Swells generated by Hanna will continue to affect much
of the Texas and Louisiana coasts for another day or so. These
swells are likely to cause life-threatening surf and rip current
conditions. Please consult products from your local weather
TORNADOES: A few tornadoes are possible overnight over parts of
the lower to middle Texas coastal plain.
Next complete advisory at 400 AM CDT.