SWOMCD
SPC MCD 140254
TXZ000-140500-
MESOSCALE DISCUSSION 0485
NWS STORM PREDICTION CENTER NORMAN OK
0954 PM CDT FRI APR 13 2007
AREAS AFFECTED...TX HILL COUNTRY...LOWER RIO GRANDE VALLEY INTO
MIDDLE/LOWER TX COAST
CONCERNING...TORNADO WATCH 138...
VALID 140254Z - 140500Z
POTENTIAL FOR MAINLY LARGE HAIL AND LOCALLY DAMAGING WINDS IS
EXPECTED TO CONTINUE THROUGH 04Z. THEREAFTER...STORMS MAY TEND TO
WEAKEN AS THEY APPROACH ERN EDGE OF WW 138.
AS OF 0240Z...SAN ANTONIO RADAR IMAGERY INDICATED A CLUSTER OF
STRONG TO SEVERE TSTMS OVER HAYS...CALDWELL...COMAL...GUADALUPE AND
BEXAR COUNTIES...WITH THE SRN MOST STORM EXHIBITING SUPERCELL
CHARACTERISTICS AS IT MOVES THROUGH THE SAN ANTONIO METRO AREA.
INFLOW AIR MASS REMAINS QUITE MOIST WITH DEWPOINTS IN THE LOWER
70S...EFFECTIVELY CONTRIBUTING TO MLCAPES OF 1000-1500 J/KG.
00Z SOUNDINGS FROM BRO AND CRP INDICATED THAT BOUNDARY LAYER OVER
THE MID AND LOWER TX COAST WAS RELATIVELY SHALLOW WITH A
CONSIDERABLE CAP OBSERVED IN THE 900-700 MB LAYER. CURRENT THINKING
IS THAT ONGOING STORMS MAY TEND TO WEAKEN BY 04Z AS THEY CONTINUE
ESEWD INTO THE PROGRESSIVELY MORE CAPPED AIR MASS. HOWEVER PRIOR TO
THIS TIME...STORM-RELATIVE INFLOW OF AROUND 50 KT COUPLED WITH
NON-HYDROSTATIC PRESSURE GRADIENT FORCE ATTENDANT TO SUPERCELL
UPDRAFT SHOULD HELP SUSTAIN THE SRN STORM FOR A PERIOD OF TIME AS IT
ENCOUNTERS A MORE HOSTILE THERMODYNAMIC ENVIRONMENT.
.MEAD.. 04/14/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...HGX...FWD...CRP...EWX...SJT...
31199833 30889720 30199649 29819647 29259652 28519763
28489997 28080007 28140038 29290098 30929929
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