Flood Potential Outlook
Issued by NWS Chicago, IL

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FGUS73 KLOT 121559

Hydrologic Outlook
National Weather Service Chicago IL
1059 AM CDT Tue Mar 12 2019

...Flooding possible late this week...

A combination of rainfall and snowmelt may cause flooding on area
rivers, especially those in the Rock and Fox River Basins in
northern Illinois.

This flood potential exists through at least this weekend.

A strong weather system is expected to move slowly through the
upper Midwest over the next few days bringing warmer
temperatures, snow melt, and chances for rainfall to the area.
Although confidence in exact amounts is not yet high, rainfall
averaging about 1 inch is expected in the Rock and Fox River
basins. Soil moisture remains much above average for this time of
year, increasing the amount of runoff which will occur from any
rainfall. In addition, snowpack observations suggest 0 to 4 inches
of water equivalent in the Rock River basin and 0 to 3 inches in
the Fox River basin. Warmer temperatures are expected to melt a
large portion of this snowpack which also will add to the runoff.

Forecast rainfall and snow melt over the next 48 hours is already
expected to cause numerous river locations to exceed flood stage
in the Rock and Fox River basins. Exact locations of heaviest
rainfall are not yet clear, however, and forecast crests may be
adjusted upward or downward as details on the flood risk become
more clear.

This outlook means that elevated river conditions and potential
impacts are possible, but not yet certain. Those with interests
along area rivers should closely monitor future river forecasts
including additional flood watches, warnings, or advisories.



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