MESO: Mesoscale Discussion 0378

ACUS11 KWNS 030327
SWOMCD
SPC MCD 030326
TXZ000-030430-

MESOSCALE DISCUSSION 0378
NWS STORM PREDICTION CENTER NORMAN OK
1026 PM CDT TUE APR 02 2013

AREAS AFFECTED...PORTIONS OF CNTRL/SRN TX

CONCERNING...SEVERE THUNDERSTORM WATCH 79...

VALID 030326Z - 030430Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 79
CONTINUES.

SUMMARY...THE SVR THREAT CONTINUES ACROSS PARTS OF WW 79...AND
CONVECTIVE TRENDS ARE BEING MONITORED FOR THE POSSIBLE ISSUANCE OF A
NEW WW.

DISCUSSION...FORWARD PROPAGATION OF A SQUALL LINE FROM CNTRL TX TO
THE RIO GRANDE RIVER 60 WSW COT WILL LIKELY BE ASSOCIATED WITH A SVR
THREAT DURING THE OVERNIGHT HOURS ACROSS PORTIONS OF CNTRL TX INTO
THE BRUSH COUNTRY OF SRN TX. THESE AREAS ARE BEING MONITORED FOR THE
POSSIBLE ISSUANCE OF A NEW WW. THE AIR MASS IS RELATIVELY MORE
UNSTABLE S OF A STALLED OUTFLOW BOUNDARY THAT INTERSECTS THE SQUALL
LINE 20 W OF HDO AND EXTENDS EWD TO THE MIDDLE TX COASTAL PLAIN. THE
GREATEST SVR THREAT WILL EXIST ALONG AND S OF THIS
BOUNDARY...ESPECIALLY OVER THE SRN EXTENT OF THE LINE WHERE AN
EMBEDDED SUPERCELL STRUCTURE IS EVOLVING. N OF THE
BOUNDARY...SOMEWHAT LESS INSTABILITY EXISTS IN THE BOUNDARY
LAYER...THOUGH AT LEAST MODEST DEEP SHEAR PER VWP DATA SHOULD
INTERACT WITH THE COLD POOL CIRCULATION TO MAINTAIN A SVR THREAT
INTO THE OVERNIGHT HOURS.

..COHEN.. 04/03/2013

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...CRP...EWX...

LAT...LON 29579939 30379874 30219789 28239786 27499871 27509958
28110010 28869998 29579939

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