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Hydrologic Outlook

Hydrologic Outlook

Hydrologic Outlook
National Weather Service Chicago IL
147 PM CDT Fri Sep 20 2019 /247 PM EDT Fri Sep 20 2019/

...Heavy rainfall likely this weekend...

A slow-moving storm system moving into the area by this weekend
will likely produce waves of moderate to heavy rainfall across the
area. River flooding and flash flooding are possible from Saturday
night through at least early next week.

Some portions of northern Illinois and southern Wisconsin have
already experienced significant rainfall over the last two weeks.
This wet weather has contributed to elevated soil moisture and
water levels. Closer to central Illinois and northwestern Indiana,
rainfall amounts have been lower, resulting in near normal soil
moisture and water level values.

Several rounds of rainfall will be possible from Saturday
afternoon through Sunday evening. Rainfall may be moderate to
heavy at times. Widespread rainfall amounts of one to three
inches are possible across the region, with localized amounts of
three to five inches. The exact location of heaviest rainfall
remains uncertain at this time. Flash flooding may be possible in
areas that experience heavy rainfall over a few hour period.
Prolonged river flooding, as well as new flood crests, are
possible in areas that experience the heaviest rainfall over many
hours. Areas that may experienced additional river flood impacts
include the Des Plaines, Fox, and Rock River Basins.

This outlook means that elevated water levels and potential
impacts are possible, but not yet certain. Persons should closely
monitor forecasts including the possibility of flood watches,
warnings, and advisories.



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