WATCHES: Tornado Watch Number 78

WWUS20 KWNS 230238
SEL8
SPC WW 230238
TXZ000-230900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 78
NWS STORM PREDICTION CENTER NORMAN OK
935 PM CDT THU APR 22 2010

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

SOUTHWEST AND WEST CENTRAL TEXAS

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 935 PM
UNTIL 400 AM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES EAST NORTHEAST OF BIG
SPRING TEXAS TO 65 MILES EAST SOUTHEAST OF DRYDEN TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 76...WW 77...

DISCUSSION...TSTMS HAVE BEGUN TO FORM IN THE PAST HOUR ALONG MERGING
COLD FRONT/DRY LINE IN SW TX...W OF MAF. AREA VWP AND SFC DATA
SUGGEST THAT RESULTING LOW-LVL CONVERGENCE WILL BE SUFFICIENT FOR
SUSTAINED STORMS/POSSIBLE SUPERCELLS GIVEN /1/ INCREASING MOISTURE
/PW APPROACHING INCH/ IN SSELY NEAR-SFC FLOW E OF FRONT/DRY
LINE.../2/ GLANCING INFLUENCE OF UPR DISTURBANCE MOVING NNE ACROSS
NM...AND /3/ PRESENCE OF STRONG WSWLY DEEP SHEAR. LARGE HAIL...DMGG
WINDS...AND ISOLD TORNADOES MAY OCCUR AS THE STORMS ORGANIZE INTO
BROKEN BANDS

AVIATION...TORNADOES AND 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
550. MEAN STORM MOTION VECTOR 25030.

...CORFIDI

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