THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED AN
* URBAN AND SMALL STREAM FLOOD ADVISORY FOR...
COOK COUNTY IN NORTHEAST ILLINOIS...
DUPAGE COUNTY IN NORTHEAST ILLINOIS...
KANE COUNTY IN NORTHEAST ILLINOIS...
MCHENRY COUNTY IN NORTHEAST ILLINOIS...
SOUTHERN LAKE COUNTY IN NORTHEAST ILLINOIS...
* UNTIL 830 PM CDT
* AT 529 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH HEAVY RAINFALL MOVING SLOWLY SOUTHWARD ACROSS
THE CHICAGO METRO AREA. DOPPLER RADAR ESTIMATED RAINFALL AMOUNTS
IN EXCESS OF ONE INCH PER HOUR WITH THESE STORMS...WITH EVEN
ISOLATED AREAS AROUND TWO INCHES PER HOUR UNDER THE STRONGEST
STORMS. A VOLUNTEER OBSERVER IN HARVARD REPORTED OVER TWO AND A
HALF INCHES OF RAIN IN ONE HOUR.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE MINOR FLOODING TO
OCCUR...ESPECIALLY ALONG SMALL STREAMS...NEAR LOW WATER
CROSSINGS...AND IN POOR DRAINAGE AREAS. SOME LOCATIONS THAT WILL
EXPERIENCE MINOR FLOODING INCLUDE CHICAGO AND NORTHERN...
NORTHWESTERN...AND WESTERN AREAS OF THE METRO. THE INTERSTATE 90
AND 88 CORRIDORS...ALONG WITH ROADWAYS THROUGHOUT THE METRO...WILL
BE AFFECTED.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN ADDITIONAL ONE TO TWO AND A HALF INCHES OF RAINFALL ARE POSSIBLE
IN THE ADVISORY AREA...THROUGH 830 PM.
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE ELEVATED LEVELS ON SMALL
CREEKS AND STREAMS...PONDING OF WATER ON ROADS...URBAN AREAS...
HIGHWAYS... VIADUCTS...UNDERPASSES AND LOW LYING AREAS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4242 8844 4230 8820 4219 8778 4206 8766
4190 8760 4184 8760 4175 8752 4166 8753
4169 8803 4173 8803 4172 8860 4215 8859
4215 8870 4249 8871 4250 8870
