SEVERE THUNDERSTORM WATCH NUMBER 70
NWS STORM PREDICTION CENTER NORMAN OK
900 PM CST THU MAR 8 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTH TEXAS
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 900 PM
UNTIL 400 AM CST.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHEAST OF
COTULLA TEXAS TO 130 MILES SOUTH SOUTHEAST OF COTULLA TEXAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
DISCUSSION...TSTMS /INCLUDING A SUPERCELL/ HAVE DEVELOPED AHEAD OF
COLD FRONT TONIGHT WITHIN A MOIST...UNSTABLE AIR MASS WITH MUCAPE
VALUES OF 1000-2000 J/KG. CAP OBSERVED ON 00Z CRP/BRO SOUNDINGS IS
LIKELY BEING OFFSET TO SOME DEGREE BY THE STRENGTHENING SLY/SELY
LOW-LEVEL WINDS WHICH IS ENHANCING INFLOW INTO THE ONGOING STORMS.
GIVEN THE PRESENCE OF 50-60 KT DEEP-LAYER SHEAR...ENVIRONMENT WILL
REMAIN FAVORABLE FOR ORGANIZED STORM MODES WITH ATTENDANT THREATS
FOR DAMAGING WINDS AND LARGE HAIL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 28020.
...MEAD
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