Hydrologic Outlook issued January 17 at 11:23AM CST by NWS Chicago IL

ESFLOT

Favorable conditions for river ice development and possible ice jams
are expected from Saturday through at early next week, impacting the
Rock, Fox, Des Plaines, and Kankakee river basins.

Bitterly cold temperatures will return to the region Saturday into
Saturday night and persist through early next week. This will make
conditions favorable for the rapid formation of river ice on area
rivers and tributaries. River ice spotters and river gauge data
indicate that most area rivers already have some areas of heavy
river ice including a few minor ice jams. New ice jams will be
possible along the Rock, Fox, Des Plaines, and Kankakee rivers,
including their tributaries. Any ice jam that develops will have the
potential to cause rises on area rivers with little warning and
isolated areas of flooding are possible.

This outlook means that elevated water levels and potential impacts
are possible, but not yet certain. Persons along area rivers should
continue to monitor the latest forecasts
into next week.

This product will be updated by tomorrow afternoon.