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033 

WWUS20 KWNS 130301

SEL9

SPC WW 130301

KSZ000-OKZ000-130900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 159

NWS STORM PREDICTION CENTER NORMAN OK

1000 PM CDT WED MAY 12 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST KANSAS

       NORTHWEST OKLAHOMA



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1000 PM

UNTIL 400 AM 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF

CLINTON OKLAHOMA TO 35 MILES NORTHEAST OF CHANUTE KANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



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 155...WW 156...WW

157...WW 158...



DISCUSSION...DEEP CONVECTION LIKELY TO CONTINUE TO PLAGUE AREAS OF

NORTHWEST OKLAHOMA AND SOUTH-CENTRAL KANSAS LATE THIS EVENING AND

THROUGH MIDNIGHT BOTH AHEAD OF AND IMMEDIATELY BEHIND SHARP FRONTAL

ZONE BISECTING THE REGION. STRONG ASCENT AIDED BY SHORT WAVE TROUGH

DEVELOPING EAST FROM NEW MEXICO...IN ADDITION TO STRENGTHENING

NOCTURNAL LOW LEVEL JET...SHOULD CONTINUE TO AID STORM DEVELOPMENT

IN A MODERATELY UNSTABLE AND STRONGLY SHEARED ENVIRONMENT.

POST-FRONTAL/OUTFLOW STORMS WILL LIKELY CONTAIN LARGE HAIL WHILE

ACTIVITY AHEAD OF THE FRONT AND OUTFLOW MAY PRODUCE DAMAGING WINDS.

WHILE STILL NOT CERTAIN...AN MORE ORGANIZED MCS MAY EVOLVE AND

SPREAD INTO ERN PORTIONS OF THE WATCH IN THE NEXT COUPLE OF HOURS.

IN ADDITION TO HAIL AND WIND THREATS...EXCESSIVE RAINFALL APPEARS

LIKELY IN THOSE AREAS EXPERIENCING REPEAT CONVECTION DUE TO

BACKBUILDING CELLS.



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 23035.





...CARBIN

