WATCHES: Severe Thunderstorm Watch Number 140

WWUS20 KWNS 120040
SEL0
SPC WW 120040
TXZ000-120600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 140
NWS STORM PREDICTION CENTER NORMAN OK
740 PM CDT SAT APR 11 2009

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

CENTRAL AND NORTHWEST TEXAS

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 740 PM
UNTIL 100 AM CDT.

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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH
NORTHWEST OF ABILENE TEXAS TO 45 MILES EAST SOUTHEAST OF SAN
ANGELO 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 139...

DISCUSSION...A BROKEN BAND OF THUNDERSTORMS...INCLUDING SUPERCELLS
WITH SIGNIFICANT HAIL IN THE MIDLAND AREA...WILL CONTINUE TO SPREAD
EWD TOWARD THE ABI-SJT CORRIDOR THROUGH THE EARLY OVERNIGHT HOURS IN
ADVANCE OF A MID LEVEL TROUGH OVER NM/FAR W TX. INSTABILITY WILL
LIKELY BE WEAKER COMPARED TO AREAS FARTHER W THIS EVENING...BUT
INCREASING LOW-LEVEL WAA/MOISTENING WILL MAINTAIN SUFFICIENT MID
LEVEL INSTABILITY TO SUPPORT LARGE HAIL WITH THE MORE INTENSE
STORMS.

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 450. MEAN STORM
MOTION VECTOR 27030.

...THOMPSON

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