WATCHES: Severe Thunderstorm Watch Number 260

WWUS20 KWNS 072315
SEL0
SPC WW 072315
ILZ000-INZ000-MOZ000-080700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 260
NWS STORM PREDICTION CENTER NORMAN OK
615 PM CDT THU MAY 7 2009

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

CENTRAL AND SOUTHERN ILLINOIS
WESTERN INDIANA
NORTHEAST MISSOURI

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 615 PM
UNTIL 200 AM 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST
SOUTHWEST OF QUINCY ILLINOIS TO 45 MILES SOUTH SOUTHEAST OF TERRE
HAUTE INDIANA. 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 258...WW 259...

DISCUSSION...TSTMS EXPECTED TO INCREASE THROUGH LATE EVE ALONG /1/
W-E BOUNDARY OVER NE MO/W CNTRL IL...AND /2/ INVOF DIFFUSE WARM
FRONTAL SEGMENT ORIENTED MORE N-S ACROSS CNTRL MO. PROXIMITY TO
STRONG ZONAL MID/UPR LVL FLOW AND SIZABLE TEMPERATURE-DEW POINT
SPREADS SUGGEST POTENTIAL FOR BOWING SEGMENTS WITH SVR WIND/HAIL AS
STORMS MERGE INTO A FORWARD-PROPAGATING MCS.

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 500. MEAN STORM
MOTION VECTOR 29035.

...CORFIDI

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