

839 

WWUS20 KWNS 200015

SEL8

SPC WW 200015

KSZ000-200800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 718

NWS STORM PREDICTION CENTER NORMAN OK

710 PM CDT WED AUG 19 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN KANSAS



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 710 PM

UNTIL 300 AM 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 75

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

MANHATTAN KANSAS TO 30 MILES EAST SOUTHEAST OF WICHITA KANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 714...WW 715...WW

716...WW 717...



DISCUSSION...TSTMS EXPECTED TO CONTINUE DEVELOPING SSW FROM SRN NEB

ALONG PRE-FRONTAL CONFLUENCE ZONE INTO CNTRL KS.  OTHER STORMS MAY

EVOLVE INVOF DIFFUSE OUTFLOW BOUNDARY LEFT BY EARLIER ELEVATED

STORMS NOW ALONG THE KS/MO BORDER.  STRENGTHENING DEEP WIND FIELD

AND MID LVL COLD ADVECTION WITH SEASONABLY STRONG/AMPLIFYING NRN

PLNS UPR TROUGH SHOULD SUPPORT UPSCALE DEVELOPMENT OF SUSTAINED

STORMS INTO ONE OR PERHAPS TWO CLUSTERS WITH SVR HAIL/WIND.  IN

ADDITION...A LOW PROBABILITY THREAT WILL EXIST FOR A TORNADO OR TWO

IF SFC-BASED STORMS CAN EVOLVE NEAR AFOREMENTIONED OUTFLOW BOUNDARY

GIVEN SLIGHTLY BACKED/MOIST LOW LVL FLOW IN ITS VICINITY.  THIS

THREAT WILL BE CONDITIONAL...AND IF IT APPEARS THAT IT WILL INDEED

MATERIALIZE...COUNTIES IN S CNTRL/SE KS MAY BE MOVED INTO TORNADO

WATCH 714 LATER THIS EVENING.



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 27030.





...CORFIDI

