Severe Thunderstorm Warning 141, NWS Chicago, IL

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HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO IL
400 AM CDT WED JUL 21 2004

ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011-019-221100-
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DU PAGE-COOK-
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-
LAKE IN-PORTER-NEWTON-JASPER-BENTON-
400 AM CDT WED JUL 21 2004

THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL
AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA.

.DAY ONE... TODAY AND TONIGHT

SEVERE THUNDERSTORMS ARE LIKELY TODAY AND THIS EVENING. A LARGE COMPLEX OF
THUNDERSTORMS WILL MOVE EAST OUT OF NORTHEAST IOWA INTO NORTHERN ILLINOIS LATER
THIS MORNING. FOR NORTHERN ILLINOIS...THE LEADING EDGE OF THE COMPLEX WILL BE
CAPABLE OF PRODUCING DAMAGING WINDS AND LOCALLY LARGE RAINFALL AMOUNTS...
PRIMARILY NORTH OF INTERSTATE 80. AS THE COMPLEX MOVES EAST INTO NORTHEAST
ILLINOIS IT WILL PRODUCE AN OUTFLOW BOUNDARY. THIS BOUNDARY WILL SERVE AS A
FOCUS FOR RENEWED THUNDERSTORM DEVELOP INTO THE AFTERNOON...PRIMARILY ALONG AND
SOUTH OF INTERSTATE 88. LARGE HAIL..LOCALLY LARGE RAINFALL AMOUNTS AND DAMAGING
WINDS WILL BE THE MAIN CONCERNS. THE AFTERNOON ACTIVITY SHOULD TAPER OFF FROM
WEST TO EAST THIS EVENING.

IN NORTHWEST INDIANA THE THUNDERSTORM COMPLEX SHOULD NOT ARRIVE UNTIL LATE
MORNING OR EARLY AFTERNOON. THE LATER ARRIVAL WILL ALLOW FOR ADDITIONAL DAYTIME
HEATING WHICH WILL ENHANCE ATMOSPHERIC DESTABILIZATION. THE ADDED INSTABILITY
WILL CONTRIBUTE TO A VERY LARGE HAIL AND DAMAGING WIND THREAT. LOCALLY LARGE
RAINFALL AMOUNTS ARE ALSO ANTICIPATED.

.DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY

THURSDAY AFTERNOON SHOULD SEE MORE THUNDERSTORMS AHEAD OF A COLD FRONT
THAT WILL ARRIVE IN THE REGION THURSDAY EVENING. AFTER THURSDAY...THE
REGION SHOULD REMAIN DRY AND RELATIVELY COOL THROUGH THE WEEKEND AND
INTO EARLY NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATER TODAY AND TONIGHT.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE
NWS CHICAGO WEBPAGE: WWW.CRH.NOAA.GOV/LOT (LOWER CASE)

LMZ740>746-766-221100-
WINTHROP HARBOR IL TO NEW BUFFALO MI-
LAKE MICHIGAN-
400 AM CDT WED JUL 21 2004

THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS
AND INDIANA WATERS OF LAKE MICHIGAN.

.DAY ONE... TODAY AND TONIGHT

PERIODS OF THUNDERSTORMS ARE EXPECTED LATER TODAY AND INTO THE EVENING.
LOCALLY VERY HEAVY RAINFALL RATES...FREQUENT CLOUD TO GROUND LIGHTING...HAIL
AND GUSTY WINDS ARE POSSIBLE THE STORMS.

.DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY

THURSDAY AFTERNOON SHOULD SEE MORE THUNDERSTORMS AHEAD OF A COLD FRONT
THAT WILL ARRIVE IN THE REGION THURSDAY EVENING. AFTER THURSDAY...THE
REGION SHOULD REMAIN DRY AND RELATIVELY COOL THROUGH THE WEEKEND AND
INTO EARLY NEXT WEEK.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE
NWS CHICAGO WEBPAGE: WWW.CRH.NOAA.GOV/LOT (LOWER CASE)