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WWUS20 KWNS 171936

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SPC WW 171936

KSZ000-OKZ000-180400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 850

NWS STORM PREDICTION CENTER NORMAN OK

230 PM CDT SAT SEP 17 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST AND SOUTH CENTRAL KANSAS

       NORTHWEST AND NORTH CENTRAL OKLAHOMA



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

1100 PM 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 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTH SOUTHEAST OF

ENID OKLAHOMA TO 45 MILES NORTHEAST OF DODGE CITY KANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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.



DISCUSSION...TSTMS EXPECTED TO FORM IN THE NEXT HOUR OR SO NEAR

INTERSECTION OF DRY LINE/CONFLUENCE ZONE ARCING EWD ACROSS FAR ERN

PARTS OF THE OK/TX PANHANDLE...AND WNW-ESE ORIENTED OUTFLOW

BNDRY/WARM FRONT OVER NRN OK.  IN THIS AREA...COMBINATION OF SFC

HEATING...CONTINUED LOW LVL MOISTURE INFLOW /AVERAGE DEWPOINTS IN

THE UPR 60S F/...AND WEAK LARGE SCALE FORCING FOR ASCENT ASSOCIATED

WITH UPR IMPULSE NOW OVER SW KS EXPECTED TO FURTHER DESTABILIZE

REGION.  AREA VWP DATA AND FCST WIND FIELDS SUGGEST POTENTIAL FOR A

FEW SUPERCELLS...ENHANCING THE RISK FOR LARGE HAIL/HIGH WIND.

TORNADOES ALSO WILL BE POSSIBLE...MAINLY WITH ANY STORMS THAT MOVE

MORE OR LESS PARALLEL TO/IN TANDEM WITH OUTFLOW BNDRY/WARM FRONT.



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 27020.





...CORFIDI

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