WATCHES: Tornado Watch Number 420

WWUS20 KWNS 022039
SEL0
SPC WW 022039
ILZ000-MOZ000-030200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 420
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT THU JUN 2 2011

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

WEST CENTRAL ILLINOIS
EAST CENTRAL MISSOURI

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
900 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 15 MILES NORTH NORTHWEST OF
COLUMBIA MISSOURI TO 10 MILES EAST NORTHEAST OF SAINT LOUIS
MISSOURI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 419...

DISCUSSION...A SMALL CLUSTER OF SEVERE/SUPERCELL THUNDERSTORMS HAVE
FORMED OVER CENTRAL MO...NEAR A REMNANT MCV. THESE STORMS ARE
EXPECTED TO TRACK EASTWARD INTO THE WATCH AREA THIS
AFTERNOON...WHILE OTHER STORMS POTENTIALLY FORM ALONG OLD OUTFLOW
BOUNDARY EXTENDING FROM MCV TO SOUTH OF STL. STRONG DEEP LAYER
EFFECTIVE SHEAR AND AMPLE CAPE WILL POSE A RISK OF SUPERCELLS
CAPABLE OF LARGE HAIL AND DAMAGING WINDS. BACKED LOW LEVEL WINDS
NORTH OF THE OUTFLOW BOUNDARY COULD ALSO POSE A THREAT OF AN
ISOLATED TORNADO.

AVIATION...TORNADOES AND 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 29025.

...HART

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