WATCHES: Severe Thunderstorm Watch Number 366

WWUS20 KWNS 211800
SEL6
SPC WW 211800
ILZ000-MOZ000-220000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 366
NWS STORM PREDICTION CENTER NORMAN OK
100 PM CDT MON JUN 21 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

LARGE PART OF CENTRAL ILLINOIS
PARTS OF CENTRAL AND EASTERN MISSOURI

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 100 PM UNTIL 700
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 70
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST
NORTHWEST OF KNOB NOSTER MISSOURI TO 20 MILES SOUTH SOUTHEAST OF
DECATUR ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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...ALONG AND S OF OUTFLOW BOUNDARY THAT EXTENDS FROM NEAR
IRK TO MKC AIR MASS IS NOW VERY UNSTABLE WITH MLCAPES AOA 3000 J/KG.
WITH 3OKT OF SHEAR AND RATHER STEEP LOW/MID LEVEL LAPSE RATES
THUNDERSTORMS EXPECTED TO INCREASE IN BOTH NUMBER AND INTENSITY
ACROSS THE WATCH WITH FURTHER DAYTIME HEATING. PRIMARY THREAT WILL
BE LARGE HAIL AND DAMAGING WINDS WHICH COULD BECOME MORE WIDESPREAD
AS STORMS DEVELOP UPSCALE INTO SMALL BOW/LINE SEGMENTS.

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 27025.

...HALES

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