WATCHES: Severe Thunderstorm Watch Number 284

WWUS20 KWNS 212019
SEL4
SPC WW 212019
TXZ000-220400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 284
NWS STORM PREDICTION CENTER NORMAN OK
320 PM CDT MON MAY 21 2007

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

SOUTHWEST TEXAS AND THE TEXAS BIG BEND

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 320 PM UNTIL
1100 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 100
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHEAST OF
FORT STOCKTON TEXAS TO 55 MILES SOUTH SOUTHEAST OF DRYDEN TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 282...WW 283...

DISCUSSION...TSTMS NOW FORMING OVER THE HIGHER TERRAIN OF SW TX
EXPECTED TO STRENGTHEN AND MOVE/DEVELOP GENERALLY ESE INTO
INCREASINGLY RICH SSELY MOISTURE RETURN UP THE RIO GRANDE. MODERATE
WLY FLOW ASSOCIATED WITH NRN FRINGE OF SRN STREAM JET SHOULD SUPPORT
DEVELOPMENT OF A FEW SUSTAINED STORMS/SUPERCELLS WITH VERY LARGE
HAIL/HIGH WIND AND POSSIBLY A BRIEF TORNADO. ACTIVITY MAY MERGE
INTO A CLUSTER BY EARLY EVENING...WITH A CONTINUING THREAT FOR SVR
E/SE ALONG AND N OF THE RIO GRANDE.

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 30020.

..CORFIDI

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