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BULLETIN
Tropical Storm Harold Intermediate Advisory Number 3A
NWS National Hurricane Center Miami FL       AL092023
100 AM CDT Tue Aug 22 2023
 
...DEPRESSION STRENGTHENS INTO A TROPICAL STORM...
...HEAVY RAINS AND TROPICAL-STORM-FORCE WINDS OVER PORTIONS OF 
SOUTH TEXAS BEGINNING LATER THIS MORNING...
 
 
SUMMARY OF 100 AM CDT...0600 UTC...INFORMATION
----------------------------------------------
LOCATION...25.8N 94.4W
ABOUT 195 MI...310 KM ESE OF PORT MANSFIELD TEXAS
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...WNW OR 285 DEGREES AT 18 MPH...30 KM/H
MINIMUM CENTRAL PRESSURE...1004 MB...29.65 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Tropical Storm Warning is in effect for...
* Mouth of Rio Grande to Port O'Connor, Texas
 
A Tropical Storm Watch is in effect for...
* Port O'Connor to Sargent, Texas
 
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within 12
hours.
 
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, in this case within 12 hours.
 
Interests elsewhere in eastern Texas and northern Mexico 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 AM CDT (0600 UTC), the center of Tropical Storm Harold was
located near latitude 25.8 North, longitude 94.4 West.  Harold is 
moving toward the west-northwest near 18 mph (30 km/h).  This 
general motion is expected to continue today and tonight, and the 
system is forecast to move inland over south Texas by midday
today.
 
Reports from an Air Force Hurricane Hunter aircraft indicate that 
the maximum sustained winds have increased to near 45 mph (75 km/h) 
with higher gusts.  Some additional strengthening is possible 
before Harold reaches the Texas coast.
 
The minimum central pressure reported by the Hurricane Hunters is 
1004 mb (29.65 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Harold can be found in the Tropical Cyclone 
Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC 
and on the web at hurricanes.gov/text/MIATCDAT4.shtml.
 
RAINFALL:  The system is expected to produce rainfall amounts of 3 
to 5 inches, with isolated higher amounts of 7 inches, across South 
Texas through early Wednesday.  Scattered instances of flash 
flooding will be possible.
 
Across Mexico, rainfall amounts of 4 to 6 inches, with local amounts
of 10 inches, are expected across portions of northern Coahuila and
northern Nuevo Leon today and Wednesday.  Scattered instances
of flash flooding are expected.
 
WIND: Tropical storm conditions are expected in the warning area
and are possible in the watch area beginning early today.
 
STORM SURGE:  The combination of a 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 Rio Grande to Sargent, including Baffin Bay, Corpus
Christi Bay and Matagorda Bay...1 to 3 ft
 
The deepest water will occur along the immediate coast near and to
the north of the landfall location, where the surge will be
accompanied by large waves.  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.
 
TORNADOES: A couple of tornadoes are possible across south Texas
from early today into the afternoon.
 
SURF: Large swells will affect portions of southern Texas through 
Tuesday.  These swells are likely to cause life-threatening surf and 
rip current conditions.  Please consult products from your local 
weather office.
 
 
NEXT ADVISORY
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Next complete advisory at 400 AM CDT.
 
$$
Forecaster Pasch
 
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