Ice jam

Pennsylvania's major rivers are above 80% frozen, according to the National Weather Service, but officials warn that water continues to flow beneath the cold crust. The state's Fish and Boat Commission has a simple message: 'Stay off of that ice.'

The National Weather Service (NWS) is warning of potential flooding and ice jams by mid-week.

January has been cold. And below freezing temperatures brings ice. Ice buildup on a river causes ice jams, which lead to flooding. And so far, despite one of the coldest Januarys in a while, there is no real threat yet for a significant jam in Northeast Pennsylvania, according to the National Weather Service.