WATCHES: Severe Thunderstorm Watch Number 747

WWUS20 KWNS 082240
SEL7
SPC WW 082240
ILZ000-INZ000-090500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 747
NWS STORM PREDICTION CENTER NORMAN OK
540 PM CDT MON AUG 8 2011

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

CENTRAL AND NORTHERN ILLINOIS
NORTHWEST INDIANA

EFFECTIVE THIS MONDAY AFTERNOON FROM 540 PM UNTIL MIDNIGHT CDT.

HAIL TO 1.5 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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES EAST
NORTHEAST OF MARSEILLES ILLINOIS TO 45 MILES SOUTH SOUTHWEST OF
BLOOMINGTON ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 746...

DISCUSSION...TSTM BAND IN NW IL HAS INTENSIFIED IN THE PAST HALF
HOUR AS SFC HEATING HAS SPREAD NEWD AHEAD OF IT IN WAKE OF LOOSELY
ORGANIZED CONVECTIVE SYSTEM NOW MOVING INTO IND. SEASONABLY STRONG
SHORTWAVE IMPULSE AND ASSOCIATED WIND FIELD MOVING ESE INTO NRN
IL...COUPLED WITH HI PW VALUES AND NARROWING PLUME OF MID LVL LAPSE
RATES ON S SIDE OF SYSTEM...SUGGEST POTENTIAL FOR BOWING SEGMENTS
WITH DMGG WIND AND POSSIBLY MARGINALLY SVR HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27025.

...CORFIDI

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