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742 

WWUS20 KWNS 190348

SEL8

SPC WW 190348

OKZ000-TXZ000-191000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 188

NWS STORM PREDICTION CENTER NORMAN OK

1050 PM CDT TUE MAY 18 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN OKLAHOMA

       TEXAS PANHANDLE



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1050 PM

UNTIL 500 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 70 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST SOUTHWEST OF

DALHART TEXAS TO 50 MILES SOUTH OF ALVA OKLAHOMA.  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 186...WW 187...



DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS PERSIST OVER THE TX

PANHANDLE...TRACKING EASTWARD AT 20-25 KT.  THESE STORMS MAY

MAINTAIN INTENSITY FOR MUCH OF THE NIGHT AND MOVE/DEVELOP INTO

WESTERN OK.  LARGE HAIL AND DAMAGING WINDS ARE THE MAIN THREATS.

HOWEVER...STRONG AND INCREASING LOW LEVEL VERTICAL SHEAR AND

SUFFICIENT INSTABILITY MAY MAINTAIN A RISK OF ISOLATED TORNADOES FOR

A FEW MORE HOURS.



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

500. MEAN STORM MOTION VECTOR 27025.





...HART

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