When is an ice jam likely to occur?

An ice jam can occur anytime from early winter to late spring in Michigan, depending upon changes in temperatures that cause alternate freezing and melting of water surfaces. The most likely times are early winter before the surfaces are completely frozen and early spring when the ice cover begins to break up due to melting.

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1. What is an ice jam?
2. When is an ice jam likely to occur?
3. What effect does snow have on flooding potential?
4. How fast do the snow and ice melt?
5. What happens when rain falls on top of snow?
6. What is the Spring Snowmelt Flood Potential Outlook?