Watch Out for Plants: Frost Advisory Includes Cook County

The National Weather Service at 10:40 a.m. Saturday issued a Frost Advisory for late tonight, early tomorrow morning. The latest day on record to fall to 32°F is May 25, 1992. The latest day to fall below 32°F is May 21, 2002 when the temperature fell to 31°F.

URGENT – WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
1040 AM CDT SAT MAY 8 2010

…FROST ADVISORY LATE TONIGHT INTO EARLY SUNDAY MORNING…

.COLD AIR WILL SETTLE OVER NORTHERN ILLINOIS AND NORTHWEST
INDIANA TODAY. A LARGE HIGH WILL MOVE INTO CENTRAL ILLINOIS BY
SUNDAY MORNING. THE WIND IS FORECAST TO DECREASE TO LIGHT AND
VARIABLE BY SUNDAY MORNING ACROSS THE REGION. THE SKY IS EXPECTED
TO CLEAR BY MORNING SO FROST IS POSSIBLE WITH SOME ISOLATED
FREEZING TEMPERATURES EARLY SUNDAY MORNING.

Here are some low temperatures expected tonight …
Arlington Heights 37°F at 4:00 a.m.
Aurora 35°F at 4:00 a.m.
DeKalb 37°F at 4:00 a.m.
Kankakee 38°F at 4:00 a.m.
Lake Geneva, WI 34°F at 4:00 a.m.
Rockford 36°F at 4:00 a.m.
St. Charles 35°F at 4:00 a.m.
West Chicago 35°F at 4:00 a.m.
Wheeling 37°F at 4:00 a.m.