National Weather Service United States Department of Commerce

TYPES OF FLOODING - coastal, dam failures, ice jams, rivers, small streams, and urban.
 

FLOOD WATCH (BE PREPARED) - issued by your local NWS Forecast Office when conditions are favorable for flooding. It does not mean flooding will occur, but it is possible.


FLASH FLOOD WARNING (TAKE ACTION) - issued by your local NWS Forecast Office when flooding is imminent or occurring. If you are in a flood prone area move immediately to high ground. A flash flood is a sudden violent flood that can take from minutes to hours to develop. It is even possible to experience a flash flood in areas not immediately receiving rain.


FLOOD WARNING (TAKE ACTION)  - issued by your local NWS Forecast Office when flooding is imminent or already happening.


FLOOD ADVISORY (BE AWARE) - issued by your local NWS Forecast Office when flooding is not expected to be bad enough to issue a warning. However, it may cause significant inconvenience, and if caution is not exercised, it could lead to situations that may threaten life and/or property.

 

CATEGORIES:


MINOR FLOODING - minimal or no property damage, but possibly some public threat or inconvenience.


MODERATE FLOODING - some inundation of structures and roads near streams/rivers; some evacuations of people and/or transfer of property to higher ground elevations necessary.


MAJOR FLOODING - extensive inundation of structures and roads; significant evacuations of people and/or transfer of property to higher elevations.

 


BE PREPARED:

Local Flood Information Briefing Page

Local Hydrology Page

 

Flood Safety Page  - NWS

Advanced Hydrologic Prediction Service - AHPS

Ice Jam Reference & Trouble Spots

 

 

Local Definitions / Preparedness Page