SWOMCD
SPC MCD 282203
TXZ000-282300-
MESOSCALE DISCUSSION 0617
NWS STORM PREDICTION CENTER NORMAN OK
0503 PM CDT TUE APR 28 2009
AREAS AFFECTED...PORTIONS OF CNTRL INTO SERN TX
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 282203Z - 282300Z
A SHORT TERM THREAT FOR ISOLATED TORNADOES WILL PERSIST OVER
PORTIONS OF CNTRL INTO SERN TX DURING THE NEXT SEVERAL HRS. A WW IS
NOT ANTICIPATED AT THIS TIME.
SUBJECTIVE SURFACE ANALYSIS INDICATES A LOW LVL THERMAL BOUNDARY
/REINFORCED BY CONVECTIVE OUTFLOW/ POSITIONED FROM ROUGHLY 25 WSW OF
ACT TO 45 ESE OF UTS. A VERY MOIST/HIGH THETA-E LOW LVL AIRMASS
RESIDES SOUTH OF THE BOUNDARY...WHICH IS CONTRIBUTING TO SUBSTANTIAL
0-3 KM CAPE AND LOW LCL HEIGHTS /PER GUIDANCE FROM RUC SFCOA AND
AREA FORECAST SOUNDINGS/. DESPITE RATHER WEAK LOW AND DEEP LAYER
VERTICAL WIND SHEAR...FAVORABLE LOW LVL THERMODYNAMICS COMBINED WITH
ENHANCED BAROCLINICALLY GENERATED HORIZONTAL VORITICY ALONG THERMAL
BOUNDARY WILL CONTINUE TO FAVOR ISOLATED TORNADOES /AND PERHAPS A
DAMAGING WIND GUST/ DURING THE NEXT SEVERAL HRS.
..GARNER.. 04/28/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...HGX...FWD...EWX...
LAT...LON 31089492 31169579 31479662 31809766 31209797 30639760
30199635 30089511 30319446 30539445 31089492
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