

000 

WWUS20 KWNS 202031

SEL2

SPC WW 202031

KSZ000-210300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 622

NWS STORM PREDICTION CENTER NORMAN OK

330 PM CDT MON AUG 20 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL KANSAS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 330 PM UNTIL

1000 PM CDT.



HAIL TO 2.5 INCHES 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 90

STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES NORTHEAST OF

HILL CITY KANSAS TO 25 MILES WEST SOUTHWEST OF DODGE CITY KANSAS.

 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 621...



DISCUSSION...STRONG STORMS HAVE DEVELOPED ALONG AND EAST OF SURFACE

TROUGH LINE OVER WRN KS.  ENVIRONMENT IS VERY MOIST AND UNSTABLE

WITH MLCAPE TO 3000 J/KG.  WNWLY MID LEVEL FLOW IS CONTRIBUTING TO

EFFECTIVE BULK SHEAR OF 30-35 KT WHICH WILL PROMOTE STORM

ORGANIZATION.



ADDITIONAL WW MAY BE ISSUED SOON FOR PARTS OF ERN NEB AND EXTREME

WRN IA.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 26025.





...WEISS

