Alerts in Effect
Hydrologic OutlookIssued at 13:38 Monday 30 January 2023
Very cold temperatures moving into the region today through Thursday
will bring favorable conditions for rapid river ice formation and
ice jams. A few rivers in northern Illinois have already seen
increases in ice concentration.
Although confidence in the exact timing and location of potential
ice jams is low, temperatures and river levels will be consistent
with past periods of time when ice jams have occurred. The highest
threat of ice jams is on the Rock, Fox, and Kankakee rivers.
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
The next outlook is expected to be issued tomorrow.