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336 

WWUS20 KWNS 160317

SEL9

SPC WW 160317

KSZ000-MOZ000-OKZ000-161000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 109

NWS STORM PREDICTION CENTER NORMAN OK

1015 PM CDT MON APR 15 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEASTERN KANSAS

       CENTRAL AND SOUTHWEST MISSOURI

       NORTHEAST OKLAHOMA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1015 PM

UNTIL 500 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 65

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST OF

BARTLESVILLE OKLAHOMA TO 50 MILES EAST OF COLUMBIA MISSOURI.  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.



DISCUSSION...WARM ADVECTION ASSOCIATED WITH AN INCREASING LOW-LEVEL

JET ATOP A COOL POST-FRONTAL AIRMASS WILL CONTINUE TO SUPPORT

ELEVATED THUNDERSTORM DEVELOPMENT THIS EVENING/OVERNIGHT.  WITH

STEEP MID-LEVEL LAPSE RATES SUPPORTING 1000 TO 1500 J/KG ELEVATED

CAPE AND 40 TO 50 KT MID-LEVEL WEST-SOUTHWESTERLIES CONTRIBUTING TO

CLOUD-LAYER SHEAR SUPPORTIVE OF ORGANIZED/INTENSE UPDRAFTS...LARGE

HAIL CAN BE EXPECTED ACROSS THIS AREA.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 55

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24035.





...GOSS

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