Increasing Risk for Ice Jam Flooding This Week... Many area rivers have significant river ice due to the recent cold temperatures. This is producing ice jams in some locations. These ice jams can cause rises on area rivers with little warning. Warming temperatures, and additional rounds of precipitation on frozen ground will bring the risk for breakup ice jam flooding to central Indiana this week. In these circumstances, flooding can develop quickly as ice collects and obstructs the river channel, allowing water and more ice to build up behind it with the potential to produce flooding upstream of the jam until it finally breaks free. After breaking free, water levels upstream can quickly drop, while downstream river levels can increase rapidly. Flash flooding is a threat from breakup jams. Stay weather aware this week and monitor for any possible flood watches or warnings.