Risk for river ice formation and ice jams increasing late this weekend through next week... Favorable conditions for river ice development and possible ice jams are expected to move into the area by late this weekend, impacting the Rock, Fox, and Kishwaukee river basins. This risk will begin on Sunday and is expected to continue through next week. Very cold temperatures are expected to begin Saturday night into Sunday, with conditions becoming favorable for rapid formation of river ice on rivers and tributaries as early as Sunday and Monday. Ice jams will be possible in isolated areas along the Rock, Fox, and Kishwaukee rivers. River ice is expected to remain in place through most of next week while cold temperatures continue. Ice jams may cause rises on area rivers with little warning. This outlook means that elevated water levels and potential impacts are possible, but not yet certain. Persons with interests along area rivers should closely monitor the latest forecasts. This product will be updated by tomorrow afternoon.