WATCHES: Severe Thunderstorm Watch Number 584

WWUS20 KWNS 021947
SEL4
SPC WW 021947
ILZ000-INZ000-MOZ000-LMZ000-030300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 584
NWS STORM PREDICTION CENTER NORMAN OK
245 PM CDT SAT JUL 2 2011

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

CENTRAL ILLINOIS
EXTREME NORTHWEST INDIANA
EAST-CENTRAL MISSOURI
LAKE MICHIGAN

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 245 PM UNTIL
1000 PM CDT.

HAIL TO 1.5 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTH OF
VALPARAISO INDIANA TO COLUMBIA MISSOURI. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU4).

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 583...

DISCUSSION...BANDS OF PRIMARILY MULTICELL TSTMS WILL INITIATE ALONG
A SEGMENTED COLD FRONT SITUATED FROM SRN LAKE MI TO ECNTRL MO.
THOUGH VERTICAL SHEAR PROFILES ARE ANEMIC...VERY STEEP LAPSE RATES
FROM SFC TO 500 MB WILL ENCOURAGE VIGOROUS UPDRAFTS. DAMAGING WIND
GUSTS APPEAR TO BE THE PRIMARY THREAT...BUT BRIEF STRONGER UPDRAFTS
MAY YIELD LARGE HAIL AS WELL. STORM MOTION WILL NOT BE PARTICULARLY
FAST OWING TO WEAK TROPOSPHERIC WINDS. ACTIVITY WILL GRADUALLY
REACH FAR NWRN IND AND CNTRL IL BY THIS EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 26025.

...RACY

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