WATCHES: Severe Thunderstorm Watch Number 720

WWUS20 KWNS 220022
SEL0
SPC WW 220022
ILZ000-INZ000-220800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 720
NWS STORM PREDICTION CENTER NORMAN OK
720 PM CDT MON JUL 21 2008

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

CENTRAL ILLINOIS
CENTRAL INDIANA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 720 PM UNTIL
300 AM CDT.

HAIL TO 3 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST
SOUTHWEST OF PEORIA ILLINOIS TO 45 MILES EAST OF INDIANAPOLIS
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 718...WW 719...

DISCUSSION...VERY ACTIVE NIGHT EXPECTED ACROSS THIS REGION AS AIR
MASS REMAINS EXTREMELY UNSTABLE AND UNCAPPED. AREA WILL BE SKIRTED
BY STRONG SHORTWAVE TROUGH MOVING ACROSS THE NRN MS RIVER
VALLEY...ENHANCING COVERAGE OF THUNDERSTORMS. GIVEN DEGREE OF
INSTABILITY AND 35-45 KT WNWLY DEEP LAYER SHEAR...EXPECT COMBINATION
OF SUPERCELLS AND BOW ECHOES WILL OVERSPREAD THE REGION THROUGH LATE
TONIGHT. LARGER MCS WILL LIKELY EVOLVE AND POSSIBLY PRODUCE
WIDESPREAD DAMAGING WINDS AND LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29035.

...EVANS

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