ZCZC SPCSWOMCD ALL
ACUS11 KWNS 191209 
SPC MCD 191209 
TXZ000-191345-

Mesoscale Discussion 0685
NWS Storm Prediction Center Norman OK
0709 AM CDT Wed May 19 2021

Areas affected...south Texas

Concerning...Severe Thunderstorm Watch 191...

Valid 191209Z - 191345Z

The severe weather threat for Severe Thunderstorm Watch 191
continues.

SUMMARY...Damaging wind potential appears to be increasing across
parts of south Texas near the Rio Grande. Damaging gusts are
possible over the next couple of hours.

DISCUSSION...A cluster of thunderstorms west of McAllen along the
Rio Grande is becoming better organized this morning, taking on a
more intense bowing characteristic in radar imagery. Some evidence
of a developing rear inflow jet is evident in radar loops over the
past 20-30 minutes. Downstream, a very unstable airmass is in place,
with the BRO 12z RAOB indicating close to 4000 J/kg SBCAPE. Locally
intense winds are possible near the Rio Grande vicinity in southern
Starr and Hidalgo counties over the next hour or so. The bow will
continue to develop eastward at around 40kt, approaching Brownsville
by around 14-15z.

..Leitman.. 05/19/2021

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...BRO...

LAT...LON   26689921 27069886 27069852 26939818 26599765 26169755
            25959765 25909792 25969846 25989865 26089920 26439932
            26689921 

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