SWOMCD
SPC MCD 220041
OKZ000-TXZ000-KSZ000-COZ000-220245-
MESOSCALE DISCUSSION 0531
NWS STORM PREDICTION CENTER NORMAN OK
0741 PM CDT SAT APR 21 2007
AREAS AFFECTED...TX/OK PANHANDLES...TX SOUTH PLAINS
CONCERNING...TORNADO WATCH 157...
VALID 220041Z - 220245Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 157 CONTINUES.
CLUSTER OF SUPERCELLS /SOME TORNADIC/ WILL CONTINUE TO MOVE NEWD
AROUND 30 KTS ACROSS THE CENTRAL OK/TX PANHANDLE AND NRN SOUTH
PLAINS AREA IN THE NEXT FEW HOURS. THE COMBINATION OF STRONG LOW
LEVEL VERTICAL MOTION EVIDENT BY THE 00Z AMA SOUNDING AND A STRONG
PRESSURE FALL MAX CENTERED OVER THE TX PANHANDLE...INCREASING LOW
LEVEL JET AND SUPERCELLULAR CONVECTION APPROACHING AN OLD
DIFFERENTIAL HEATING BOUNDARY EXTENDING FROM DUMAS TO NEAR AMA TO
SWISHER/BRISCOE COUNTIES SUGGESTS THAT THE POTENTIAL FOR SIG
TORNADOES MAY INCREASE OVER THE NEXT 1-2 HRS. STRENGTHENING PRESSURE
RISES OVER SERN NM WILL SUPPORT A SURGING DRYLINE/PACIFIC COLD FRONT
INTO THE WRN PANHANDLES/WRN SOUTH PLAINS OVER THE NEXT FEW HRS. IT
IS ANTICIPATED THAT DEVELOPING SVR CONVECTION ALONG THIS SURGING
DRYLINE WILL OVERTAKE THE MORE DISCRETE SUPERCELLS IN THE 03-05Z
TIME FRAME ACROSS THE ERN TX/OK PANHANDLES AND LOW ROLLING PLAINS
WITH THE PRIMARY SVR THREAT OVER THE REMAINDER OF WW 157 LIKELY
TRANSITIONING TO DMGG WINDS.
.CROSBIE.. 04/22/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...DDC...SJT...LUB...AMA...MAF...PUB...
36990300 32010301 32100066 32950061 32989992 36959998
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