SPC Severe Thunderstorm Watch 623

WW 623 SEVERE TSTM KS OK 052100Z – 060400Z


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

via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0623.html