WATCHES: Severe Thunderstorm Watch Number 701

WWUS20 KWNS 211932
SEL1
SPC WW 211932
OKZ000-TXZ000-220300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 701
NWS STORM PREDICTION CENTER NORMAN OK
235 PM CDT THU OCT 21 2010

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

PARTS OF SOUTHWEST OKLAHOMA
PARTS OF WESTERN TEXAS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 235 PM UNTIL
1000 PM 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 50 MILES NORTHWEST OF
ALTUS OKLAHOMA TO 30 MILES SOUTH OF FORT STOCKTON TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).

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...AIR MASS CONTINUES TO DESTABILIZE AHEAD OF THE OUTFLOW
FROM MORNING MCS AND IN ADVANCE OF THE AZ UPPER LOW. WITH MLCAPES
NOW AROUND 1500 J/KG ALONG WITH INCREASINGLY FAVORABLE DEEP LAYER
SHEAR WITH APPROACH OF JET MAX OVER NRN MEXICO...STRONG/SEVERE
THUNDERSTORMS SHOULD DEVELOP ACROSS THE WATCH AREA THRU THE
REMAINDER OF THE AFTERNOON. CONDITIONS FAVORABLE FOR SUPERCELLS
WHICH WOULD ENHANCE BOTH LARGE HAIL AND WIND DAMAGE POTENTIAL.

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 24030.

...HALES

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