SWOMCD
SPC MCD 080253
TXZ000-080430-
MESOSCALE DISCUSSION 0475
NWS STORM PREDICTION CENTER NORMAN OK
0953 PM CDT SAT APR 07 2012
AREAS AFFECTED...EDWARDS PLATEAU OF SWRN TX
CONCERNING...SEVERE THUNDERSTORM WATCH 150...
VALID 080253Z - 080430Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 150
CONTINUES.
A SLOW MOVING MCS HAS EVOLVED ALONG COLD FRONT AS IT PROGRESSES SWD
ACROSS THE EDWARDS PLATEAU. 00Z SOUNDINGS ACROSS THIS REGION
EXHIBITED STEEP LOW LEVEL LAPSE RATES BUT ALSO DISPLAYED ONLY
MARGINAL DEEP LAYER SHEAR. IN THE ABSENCE OF STRONG SHEAR...THE MCS
APPEARS TO BE THRIVING ON FRONTAL CONVERGENCE...ENHANCED BY
EXPANDING POST-FRONTAL PRECIP...AND YET TO BE OVERTURNED INSTABILITY
ACROSS SWRN TX. LATEST RADAR IMAGERY SUGGESTS THE OVERALL MCS IS
PROPAGATING SWD AT 10-20KT AND COULD APPROACH THE MEXICAN BORDER
LATER TONIGHT. IN ADDITION TO HEAVY RAIN LARGE HAIL REMAINS THE
GREATEST SEVERE THREAT WITH THIS ACTIVITY AND PORTIONS OF WW150 WILL
BE EXTENDED IN TIME TO ACCOUNT FOR THIS EVOLUTION.
..DARROW.. 04/08/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...EWX...SJT...MAF...
LAT...LON 31140239 31180017 30260024 30130216 31140239
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