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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 508

NWS STORM PREDICTION CENTER NORMAN OK

825 PM CDT SAT JUN 18 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ILLINOIS

       CENTRAL AND EASTERN MISSOURI



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 825 PM

UNTIL 400 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH

NORTHWEST OF SAINT LOUIS MISSOURI TO 25 MILES SOUTHWEST OF WEST

PLAINS MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 501...WW 503...WW

504...WW 505...WW 506...WW 507...



DISCUSSION...TSTMS EXPECTED TO FORM LATER THIS EVE INVOF DIFFUSE

WNW/ESE ORIENTED WARM FRONT ROUGHLY BISECTING WW AREA...WITH OTHER

STORMS EXPECTED TO MOVE/DEVELOP EWD FROM ERN KS/SW MO THOUGH EARLY

SUN AS VEERING OF MODERATE LLJ ENHANCES WAA/MOISTURE TRANSPORT OVER

REGION.  30-40 KT WSWLY DEEP SHEAR AND DEGREE OF INSTABILITY /MUCAPE

AOA 4000 J PER KG/ SHOULD SUPPORT UPSCALE DEVELOPMENT INTO ONE OR

MORE COMPLEXES...WITH EMBEDDED BOWING SEGMENTS LIKELY POSING A

THREAT FOR DMGG WIND...SVR HAIL...AND POSSIBLY ONE OR TWO TORNADOES.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 27030.





...CORFIDI

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