Flash Flood Watch
Issued generally when there is the possibility of flash flooding or urban flooding over an area within the next 36 hours.
Flash Flood Warning
Issued when flash flooding is imminent, generally within the next 1 to 3 hours. Usually issued based on observed heavy rainfall (measured or radar estimated), but may also be issued for significant dam breaks that have occurred or are imminent.
Issued when there is the possibility of widespread general flooding over an area within the next 36 hours.
Flood Warning for River Forecast Point
Issued when a river gauge has exceeded, or is forecast to exceed, a predetermined flood stage.
Issued when flooding is imminent or occurring, generally within the next 1 to 3 hours, but is not expected to substantially threaten life and property.
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