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Tropical Storm Hanna Intermediate Advisory Number 7A
NWS National Hurricane Center Miami FL AL082020
100 PM CDT Fri Jul 24 2020
...HANNA CONTINUES TO STRENGTHEN OVER THE WESTERN GULF OF MEXICO...
SUMMARY OF 100 PM CDT...1800 UTC...INFORMATION
ABOUT 230 MI...375 KM E OF CORPUS CHRISTI TEXAS
ABOUT 230 MI...375 KM E OF PORT MANSFIELD TEXAS
MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H
PRESENT MOVEMENT...WNW OR 285 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* Mouth of the Rio Grande to San Luis Pass Texas
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within 24
to 36 hours.
Interests along the Texas and Louisiana coast should 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 PM CDT (1800 UTC), the center of Tropical Storm Hanna was
located by satellite and NOAA Doppler weather radars near latitude
27.3 North, longitude 93.7 West. Hanna is moving toward the
west-northwest near 9 mph (15 km/h), and this motion should continue
this afternoon. A turn toward the west is expected tonight,
followed by a westward to west-southwestward motion through the
weekend. On the forecast track, center of Hanna should make
landfall along the Texas coast within the warning area Saturday
afternoon or evening.
Maximum sustained winds have increased to near 50 mph (85 km/h)
with higher gusts. Additional strengthening is expected until the
tropical cyclone makes landfall. Steady weakening is expected after
Hanna moves inland.
Tropical-storm-force winds extend outward up to 60 miles (95 km)
from the center. During the past couple of hours, a ship located
just east of the center reported a sustained wind of 46 mph (74
The estimated minimum central pressure is 999 mb (29.50 inches).
HAZARDS AFFECTING LAND
Key messages for Tropical Storm Hanna can be found in the
Tropical Cyclone Discussion under AWIPS header MIATCDAT3 and WMO
header WTNT43 KNHC.
WIND: Tropical storm conditions are expected in the warning area
by tonight or Saturday morning.
RAINFALL: Hanna is expected to produce 4 to 8 inches of rain with
isolated maximum totals of 12 inches through Sunday night in south
Texas. This rain may result in life-threatening flash flooding,
rapid rises on small streams, and isolated minor to moderate river
flooding in south Texas.
3 to 5 inches of rain is expected along the upper Texas and
Louisiana coasts, and inland to the Mexican states of Coahuila,
Nuevo Leon, and northern Tamaulipas.
STORM SURGE: The combination of 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...
Mouth of the Rio Grande to High Island including Corpus Christi Bay,
Matagorda Bay, and Galveston Bay...1-3 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.
SURF: Swells generated by Hanna are expected to increase and affect
much of the Texas and Louisiana coasts during the next few days.
These swells are likely to cause life-threatening surf and rip
current conditions. Please consult products from your local weather
Next complete advisory at 400 PM CDT.