

527 

WWUS20 KWNS 101423

SEL3

SPC WW 101423

KSZ000-102100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 693

NWS STORM PREDICTION CENTER NORMAN OK

920 AM CDT MON AUG 10 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN KANSAS



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 920 AM UNTIL 400

PM CDT.



HAIL TO 2 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST

NORTHWEST OF RUSSELL KANSAS TO 5 MILES EAST SOUTHEAST OF TOPEKA

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 692...



DISCUSSION...ELEVATED THUNDERSTORM MOVING INTO CENTRAL KS HAVE

INTENSIFIED DURING THE LAST HOUR.  THE ACTIVITY IS LOCATED AHEAD OF

A MID LEVEL SHORT WAVE TROUGH MOVING ENEWD ACROSS NERN CO...AND

DYNAMIC FORCING FOR ASCENT WILL PROMOTE A FAVORABLE SYNOPTIC SCALE

ENVIRONMENT FOR CONTINUED CONVECTIVE DEVELOPMENT.  STEEP LAPSE RATES

ABOVE THE PBL WILL ENHANCE POTENTIAL FOR LARGE HAIL WITH THE STORMS

THAT ARE CURRENTLY ELEVATED...BUT THREAT FOR DAMAGING WIND GUSTS MAY

INCREASE BY AFTERNOON AS THE BOUNDARY LAYER WARMS AND UPDRAFTS

GRADUALLY BECOME ROOTED NEAR THE SURFACE.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 25025.





...WEISS

