

403 

WWUS20 KWNS 181924

SEL2

SPC WW 181924

KSZ000-MOZ000-190300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 672

NWS STORM PREDICTION CENTER NORMAN OK

225 PM CDT SAT SEP 18 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN KANSAS

       NORTHERN AND CENTRAL MISSOURI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 225 PM UNTIL

1000 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTHWEST

OF HUTCHINSON KANSAS TO 40 MILES NORTHEAST OF VICHY MISSOURI.

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.



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON ALONG SYNOPTIC COLD FRONT AND RESIDUAL

OUTFLOW BOUNDARY WITHIN A MOIST AND MODERATE TO STRONGLY UNSTABLE

AIR MASS WITH MLCAPE OF 2500-3500 J/KG.  REGION WILL REMAIN TO THE S

OF STRONGER MID AND HIGH-LEVEL WIND FIELD WITH GENERALLY 30-35 KT OF

DEEP WLY SHEAR ACROSS NRN EXTENSION OF WARM SECTOR.  AS SUCH...SETUP

WILL BE SUPPORTIVE OF ORGANIZED MULTICELL AND EPISODIC SUPERCELL

STRUCTURES WITH THE PRIMARY HAZARDS BEING HAIL AND DAMAGING WIND

GUSTS.



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 550. MEAN STORM

MOTION VECTOR 29020.





...MEAD

