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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 612

NWS STORM PREDICTION CENTER NORMAN OK

330 PM CDT FRI AUG 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN KANSAS

       NORTHWEST AND WEST-CENTRAL MISSOURI



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 330 PM UNTIL

1100 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTH

NORTHWEST OF MEDICINE LODGE KANSAS TO 30 MILES SOUTH SOUTHEAST OF

CHILLICOTHE MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 609...WW 610...WW 611...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON INTO EVENING ALONG AND AHEAD OF COLD FRONT

SLOWLY SAGGING SWD THROUGH THE REGION.  CURRENT OBJECTIVE FIELDS

INDICATE A FAVORABLE ENVIRONMENT FOR SEVERE STORMS WITH MLCAPE OF

2000-3000 J/KG AND 30-40 KT OF DEEP WSWLY SHEAR.  WHEN COUPLED WITH

STRONG EVAPORATIONAL COOLING POTENTIAL /I.E. DCAPE VALUES OF

1500-2000 J PER KG/...SETUP APPEARS QUITE SUPPORTIVE OF DAMAGING

DOWNBURST WINDS AND HAIL WITH THE MORE INTENSE STORMS/CLUSTERS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

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

MOTION VECTOR 27025.





...MEAD

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