WATCHES: Severe Thunderstorm Watch Number 70

WWUS20 KWNS 261801
SEL0
SPC WW 261801
TXZ000-CWZ000-270000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 70
NWS STORM PREDICTION CENTER NORMAN OK
1255 PM CDT THU MAR 26 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTH CENTRAL AND SOUTHEAST TEXAS
COASTAL WATERS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL
700 PM CDT.

HAIL TO 3 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH OF
COTULLA TEXAS TO 5 MILES EAST SOUTHEAST OF GALVESTON 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.

OTHER WATCH INFORMATION...CONTINUE...WW 68...WW 69...

DISCUSSION...SEVERE STORMS JUST SOUTH OF SAT ARE EXPECTED TO
CONTINUE MOVING ESEWD...WHILE OTHER STORMS IN ADVANCE OF THIS
CONVECTION ARE SLOWLY INTENSIFYING. ACTIVITY IS ALONG A LOW LEVEL
BOUNDARY WHERE STRONGER HEATING IS OCCURRING TO THE
SOUTH...ENHANCING FRONTOGENETIC FORCING. ENVIRONMENT IS MODERATELY
UNSTABLE SOUTH OF THE BOUNDARY WITH MLCAPE TO 2000J/KG. DEEP LAYER
SHEAR REMAINS STRONG WITH EFFECTIVE BULK SHEAR AOA 40
KT...INDICATING THREAT FOR SUPERCELLS CAPABLE OF PRODUCING VERY
LARGE HAIL AND A FEW DAMAGING WIND GUSTS. ACTIVITY SHOULD CONTINUE
MOVING IN A GENERAL EASTWARD DIRECTION ALONG THE NRN EDGE OF A
STRONG UPPER LEVEL JET AXIS. ALTHOUGH AN ISOLATED BRIEF TORNADO IS
POSSIBLE...WEAKER LOW LEVEL FLOW AND LIMITED LOW LEVEL SHEAR AND
HELICITY SHOULD LIMIT OVERALL TORNADO THREAT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 24030.

...WEISS

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