

148 

WWUS20 KWNS 080413

SEL3

SPC WW 080413

KSZ000-NEZ000-081200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 263

NWS STORM PREDICTION CENTER NORMAN OK

1115 PM CDT THU MAY 7 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST KANSAS

       SOUTH CENTRAL NEBRASKA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1115 PM

UNTIL 700 AM CDT.



HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

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

NORTHWEST OF GOODLAND KANSAS TO 60 MILES NORTHEAST OF RUSSELL

KANSAS.  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 259...WW 260...WW

261...WW 262...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN NUMBER/INTENSITY OVER NW

KS OVERNIGHT AS REGION IS GLANCED BY SRN FRINGE OF AMPLIFYING NRN

STREAM SHORTWAVE IMPULSE.  COMBINATION OF MODERATE TO STRONG

UNDIRECTIONAL WLY MID LVL FLOW AND SIZABLE SUB-CLOUD LAYER

TEMPERATURE-DEW POINT SPREADS SUGGEST POTENTIAL FOR STRONG WIND

GUSTS AND POSSIBLY SVR HAIL AS STORMS ENCOUNTER INCREASING MOISTURE

INFLOW WITH ESE EXTENT.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM MOTION

VECTOR 28040.





...CORFIDI

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