Monday, May 23, 2011

WATCHES: Severe Thunderstorm Watch Number 340

WWUS20 KWNS 231554
SEL0
SPC WW 231554
ILZ000-KYZ000-MOZ000-232300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 340
NWS STORM PREDICTION CENTER NORMAN OK
1055 AM CDT MON MAY 23 2011

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

SOUTHWEST ILLINOIS
WESTERN KENTUCKY
EASTERN MISSOURI

EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1055 AM UNTIL 600
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST
SOUTHWEST OF FORT LEONARD WOOD MISSOURI TO 10 MILES NORTH OF
CARBONDALE ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 337...WW 338...WW 339...

DISCUSSION...MCS WITH WELL-DEFINED MCV IS EXPECTED TO RE-INTENSIFY
THIS AFTERNOON AS IT PROGRESSES EWD AND ENCOUNTERS AN INCREASINGLY
MOIST AND UNSTABLE AIR MASS ALONG THE MS RIVER WITH MLCAPE
INCREASING TO 2000-3000 J/KG. THIS INSTABILITY COUPLED WITH A DEEP
WSWLY WIND FIELD WILL SUPPORT FORWARD-PROPAGATION OF MCS WITH THE
PRIMARY HAZARDS BEING CORRIDORS OF WIND DAMAGE AND LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27035.


...MEAD

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