Flood Potential Outlook
Issued by NWS Chicago, IL

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FGUS73 KLOT 200846

Hydrologic Outlook
National Weather Service Chicago IL
346 AM CDT Thu Jul 20 2017

Heavy rain producing thunderstorms will end by mid to late
morning over northern Illinois, but isolated storms are possible
again this afternoon and tonight. More widespread storms are
forecast Friday and especially Friday night. These storms will
likely be efficient rainfall producers. While there remains
modest uncertainty in placement of storms within the region from
Friday and Friday night, there is increasing signal that along and
north of Interstate 88 in northern Illinois and into Wisconsin
may be the most favored. Again on Saturday, there is a chance for
thunderstorms as well before drier air moves into the region.
Given wet antecedent conditions over the Des Plaines, Fox,
Kishwaukee, and north branch of the Chicago River basins, this
portion of northern Illinois is susceptible to additional flooding
if multiple rounds of heavy rainfall pan out.

Those with hydrologic concerns in the area should maintain a
close watch on the rainfall and river stage forecasts which will
become gradually more refined with time.


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