stefan
07-17-2008, 07:33 PM
one-stop flash flood watch/warning from the national weather service:
Flash Flood Forecast ~ National Weather Service (http://www.wrh.noaa.gov/slc/flashflood/)
NWS : Flash Flood Safety Awareness (informative pdf) (http://www.wrh.noaa.gov/slc/wxsafety/fldsftywrnsswk_2007.pdf)
TERMS/DEFINITIONS
Flash flood - A rapid (generally within six hours) rise of water along a stream or low-lying area after
a heavy rainfall or from the failure of a dam, levee, or ice jam. By definition, flash flooding is life-
threatening.
Flood - A flood occurs when water overflows the confines of a river, stream, or body of water, or ac-
cumulates in poorly drained low-lying or urban areas.
Hazardous Weather Outlook/Special Weather Statement - A Hazardous Weather Outlook/Special Weather Statement will be issued to alert the public of the potential for flooding/flash flooding. These products provide information on potentially hazardous weather out to 7 days.
Flash Flood Potential Rating - A qualitative rating (Low, Moderate, High, or Very High), indicative of the potential for flash flooding.
Flash Flood Watch - Issued when conditions are favorable for flash flooding. A watch usually gives 12 to 36 hours advance notice of the onset. A watch indicates a need for planning, preparation, and an increased awareness of changing weather conditions.
Flood Watch - Issued when conditions are favorable for river flooding. A watch usually gives 12 to 36 hours advance notice of the onset.
Flash Flood Warning - Issued when:
Flash Flood Forecast ~ National Weather Service (http://www.wrh.noaa.gov/slc/flashflood/)
NWS : Flash Flood Safety Awareness (informative pdf) (http://www.wrh.noaa.gov/slc/wxsafety/fldsftywrnsswk_2007.pdf)
TERMS/DEFINITIONS
Flash flood - A rapid (generally within six hours) rise of water along a stream or low-lying area after
a heavy rainfall or from the failure of a dam, levee, or ice jam. By definition, flash flooding is life-
threatening.
Flood - A flood occurs when water overflows the confines of a river, stream, or body of water, or ac-
cumulates in poorly drained low-lying or urban areas.
Hazardous Weather Outlook/Special Weather Statement - A Hazardous Weather Outlook/Special Weather Statement will be issued to alert the public of the potential for flooding/flash flooding. These products provide information on potentially hazardous weather out to 7 days.
Flash Flood Potential Rating - A qualitative rating (Low, Moderate, High, or Very High), indicative of the potential for flash flooding.
Flash Flood Watch - Issued when conditions are favorable for flash flooding. A watch usually gives 12 to 36 hours advance notice of the onset. A watch indicates a need for planning, preparation, and an increased awareness of changing weather conditions.
Flood Watch - Issued when conditions are favorable for river flooding. A watch usually gives 12 to 36 hours advance notice of the onset.
Flash Flood Warning - Issued when: