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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 623

NWS STORM PREDICTION CENTER NORMAN OK

400 PM CDT WED SEP 5 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR SOUTHERN KANSAS

       NORTHERN AND WESTERN OKLAHOMA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 400 PM UNTIL

1100 PM CDT.



HAIL TO 1.5 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 90

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHWEST OF

ALVA OKLAHOMA TO 55 MILES SOUTH SOUTHEAST OF GAGE OKLAHOMA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 620...WW 621...WW 622...



DISCUSSION...TSTMS NOW FORMING JUST BEHIND WSW-ENE COLD FRONT IN SW

KS EXPECTED TO STRENGTHEN AND MOVE/DEVELOP GENERALLY ESE OVER THE

NEXT FEW HOURS. ADDITIONAL STORMS MAY MOVE INTO WRN OK FROM ERN

PORTIONS OF THE TX PANHANDLE. DEEPLY-MIXED ENVIRONMENT AND ASCENT

WITH WEAK IMPULSE IN SRN EDGE OF THE WLYS OVER CO SHOULD AUGMENT

RISK FOR SVR WIND AND POSSIBLY HAIL AS STORMS ORGANIZE INTO A

CLUSTER.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 29025.





...CORFIDI

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