When Does it Cool Off in Chicago? Afternoon Storms Will Arrive with Cooler Temps

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The cool off will probably start about 4:00 p.m. The National Weather Service has put out a Hazardous Weather Outlook with the greatest chance for thunderstorm after 4:00 p.m. The high is expected to be about 79°F. However, one weather model predicts a high of only 70°F about 1:00 p.m. to 2:00 p.m. Only a few widespread showers developing, according to radar imaging.

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
423 AM CDT THU MAR 22 2012

WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
423 AM CDT THU MAR 22 2012 /523 AM EDT THU MAR 22 2012/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS…
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE…TODAY AND TONIGHT.

WEATHER HAZARDS EXPECTED:

CHANCE OF THUNDERSTORMS…SOME MAY PRODUCE:
CLOUD TO GROUND LIGHTNING.
AND HEAVY DOWNPOURS.

AREAS AFFECTED AND TIMING:

THE CHANCE OF THUNDERSTORMS WILL OVERSPREAD NORTHERN ILLINOIS
THIS AFTERNOON AND SPREAD INTO NORTHWEST INDIANA THIS EVENING.

DISCUSSION:

THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON INTO TONIGHT
AS A SLOW MOVING UPPER LEVEL LOW PRESSURE SYSTEM MOVES TOWARD
THE REGION. CONDITIONS DO NOT APPEAR FAVORABLE FOR SEVERE
WEATHER…HOWEVER ANY THUNDERSTORM CAN PRODUCE DEADLY CLOUD TO
GROUND LIGHTNING AND HEAVY RAIN.

.DAYS TWO THROUGH SEVEN…FRIDAY THROUGH WEDNESDAY.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS SATURDAY…ESPECIALLY
SOUTH OF INTERSTATE 80.

THERE IS A CHANCE OF THUNDERSTORMS AGAIN BY LATE TUESDAY INTO
WEDNESDAY.

.SPOTTER INFORMATION STATEMENT…

SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

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