Active AlertsPenn Yan, NY

What: Flash flooding caused by excessive rainfall is possible.
Where: Portions of central New York, including the following areas, Broome, Chemung, Chenango, Cortland, Delaware, Madison, Onondaga, Otsego, Schuyler, Seneca, Southern Cayuga, Southern Oneida, Steuben, Sullivan, Tioga, Tompkins and Yates and northeast Pennsylvania, including the following areas, Bradford, Northern Wayne and Susquehanna.
When: From 4 PM EDT this afternoon through Thursday morning.
Impacts: Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.
Additional Details: - Several inches of rain this morning will be combined with an additional 1 to 3 inches or more of rain later today and through early Thursday morning. Training thunderstorms with heavy rain could also enhance the threat for excessive runoff and flash flooding across the region. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.