The National Weather Service has extended the Flood Watch for the Allegheny River until Thursday afternoon (Jan. 16) at 4:00 PM.
The watch area extends from West Hickory southward to the CW Bill Young Dam in the Pittsburgh area.
A river Flood Warning issued Friday afternoon was downgraded on Sunday to a Flood Watch, which was originally expected to expire on Tuesday afternoon at 4:00 PM.
The NWS says river ice continues moving slowly, maintaining the threat of ice jamming. At least five ice jams are already being carefully watched. The milder temperatures, combined with a chance of rain Tuesday night, are helping to erode the ice on the river, but the situation heightens the possibility of new ice jams forming, especially from Parker to Pittsburgh.
Ice jams can form very quickly. They can cause rapid backwater rises and flooding. Once an ice jam breaks, the surge of water moving downstream could also be capable of causing flooding.