WATCHES: Severe Thunderstorm Watch Number 161

WWUS20 KWNS 220402
SEL1
SPC WW 220402
OKZ000-TXZ000-220800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 161
NWS STORM PREDICTION CENTER NORMAN OK
1100 PM CDT SAT APR 21 2007

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

WESTERN OKLAHOMA
A SMALL PART OF NORTHWEST TEXAS

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1100 PM
UNTIL 300 AM CDT.

HAIL TO 1.5 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 40
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST
NORTHWEST OF ALVA OKLAHOMA TO 45 MILES SOUTHEAST OF CHILDRESS
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.

OTHER WATCH INFORMATION...CONTINUE...WW 157...WW 158...WW
159...WW 160...

DISCUSSION...LINE OF INTENSE STORMS CONTINUES TO SHIFT QUICKLY EWD
TOWARDS WRN OK/NWRN TX LATE THIS EVENING. NARROW MUCAPE AXIS AND
INCREASING CINH INTO WRN OK SUGGESTS THIS BROKEN LINE OF STORMS MAY
WEAKEN OVER WRN OK OVERNIGHT. HOWEVER...ACTIVITY REMAINS QUITE
ORGANIZED ATTM AND LOW-DEEP LAYER SHEAR IS QUITE STRONG.
THEREFORE...ISOLATED DAMAGING WINDS AND LARGE HAIL MAY ACCOMPANY
THIS ACTIVITY FOR A FEW MORE HOURS BEFORE STORMS DIMINISH TONIGHT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 26035.

..EVANS

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