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WWUS20 KWNS 082237

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 108

NWS STORM PREDICTION CENTER NORMAN OK

535 PM CDT FRI APR 8 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH CENTRAL INTO EAST CENTRAL KANSAS

       WESTERN AND NORTHERN OKLAHOMA



EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 535 PM

UNTIL 100 AM CDT.



TORNADOES...HAIL TO 2.5 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 65 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH OF CLINTON

OKLAHOMA TO 25 MILES EAST NORTHEAST OF CHANUTE KANSAS.  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 106...WW 107...



DISCUSSION...TSTMS HAVE FORMED IN THE PAST HALF HOUR ALONG LOW-LVL

CONFLUENCE AXIS OVER N CNTRL OK.  TWRG CU EXTEND SSW FROM THAT AREA

ALONG DRY LINE INTO SW OK.  SFC-BASED CU ALSO ARE APPARENT ALONG W/E

FRONT OVER S CNTRL/E CNTRL KS.  DESPITE APPARENT RIDGING ALOFT /PER

WV IMAGERY/...COMBINATION OF STRONG INSTABILITY AND LOW-LVL

CONFLUENCE MAY SUPPORT SUSTAINED STORMS/POSSIBLE SUPERCELLS WITH

LARGE HAIL/LOCALLY DMGG WIND THROUGH LATE EVE.  WHILE LOW-LVL SHEAR

ATTM IS SOMEWHAT MARGINAL FOR TORNADOES...EXPECTED STRENGTHENING OF

850-700 MB FLOW AFTER DARK INTERACTING WITH EXISTING SUSTAINED

STORMS MAY YIELD A THREAT FOR TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24025.





...CORFIDI

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