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Tropical Depression Hanna Forecast Discussion


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000
WTNT43 KNHC 262034
TCDAT3

Tropical Depression Hanna Discussion Number  16
NWS National Hurricane Center Miami FL       AL082020
400 PM CDT Sun Jul 26 2020

Surface observations along with radar and satellite imagery show
that Hanna continues to weaken as it moves farther inland.  There
have been no recent observations of sustained tropical-storm-force
winds, and Doppler velocities have continued to decrease.  Based on
these trends, the initial wind speed has been reduced to 30 kt.
Hanna should continue to spin down while it moves over the high
terrain of northeastern Mexico.  The system is forecast to become
a remnant low in 12-18 hours, and should dissipate over the 
mountains of Mexico by late Monday, if not sooner.

Hanna is moving west-southwestward or 245/8 kt. The cyclone should 
continue on this general heading and speed until dissipation
occurs.  The updated NHC track forecast is again similar to the
previous advisory and is close to the dynamical model consensus.

This is the last NHC advisory on Hanna.  Future information on this 
system can be found in Public Advisories issued by the Weather 
Prediction Center beginning at 10 PM CDT, under AWIPS header 
TCPAT3, WMO header WTNT33 KWNH, and on the web at 
http://www.wpc.ncep.noaa.gov. 

Key Messages

1. Heavy rainfall from Hanna has already produced numerous reports 
of flash flooding across south Texas.  Additional heavy rainfall 
will continue to result in life-threatening flash flooding over 
south Texas and northern Mexico, and isolated minor river flooding 
in south Texas.


FORECAST POSITIONS AND MAX WINDS

INIT  26/2100Z 25.6N 100.6W   30 KT  35 MPH...INLAND
 12H  27/0600Z 25.2N 101.6W   25 KT  30 MPH...INLAND
 24H  27/1800Z 25.0N 102.6W   20 KT  25 MPH...POST-TROP/INLAND
 36H  28/0600Z...DISSIPATED

$$
Forecaster Brown