![]() In addition, some NWS Weather Forecast Offices have instituted an enhanced flash flood warning, referred to as a flash flood emergency (or as termed by the Albany, New York office as a flash flood warning emergency ), which indicates a severe flooding situation in densely populated areas, similar to the procedure for declaring a tornado emergency. ![]() Move to higher ground if rapidly rising water is seen or heard.Residents are usually urged to do the following when flash flooding is imminent: įlash floods can also occur because of a dam or levee failure, or because of a sudden release of water held by an ice jam. One is a flash flood watch, which means that conditions are favorable for flash flooding, and the other is a flash flood warning, meaning that a flash flood is occurring or one will occur imminently and is usually issued when there are strong weather radar echoes for an area that is prone to flash flooding. There are two types of alerts for flash floods which are issued by the National Weather Service. It is possible to experience a flash flood without witnessing any rain. Flash floods may take minutes or hours to develop. Most flash floods occur when there is a heavy amount of precipitation falling in an area and that water is then channeled through streams or narrow gullies. ![]() Rainfall intensity and duration, topography, soil conditions, and ground cover contribute to flash flooding. A flash flood is a sudden, violent flood after a heavy rain, or occasionally after a dam break. ( Learn how and when to remove this template message)Ī flash flood warning ( SAME code: FFW) is a severe weather warning product of the National Weather Service that is issued by national weather forecasting agencies throughout the world to alert the public that a flash flood is imminent or occurring in the warned area. Consider transferring direct quotations to Wikiquote or, for entire works, to Wikisource. ![]() Please help improve the article by presenting facts as a neutrally worded summary with appropriate citations. Severe Thunderstorm Warning: A severe thunderstorm has actually been observed by spotters or indicated on radar, and is occurring or imminent in the warning area.This article contains too many or overly lengthy quotations for an encyclopedic entry. Severe Thunderstorm Watch: Conditions are conducive to severe thunderstorms in and close to the watch area. Tornado Warning: A tornado has actually been sighted by spotters or indicated on radar and is occurring or imminent in the warning area. Tornado Watch: Conditions are conducive to the development of tornadoes in and close to the watch area. It can be issued as a result of torrential rains, a dam failure, or ice jam. Flash Flood Watches are generally issued for flooding that is expected to occur within six hours after heavy rains have ended.įlash Flood Warning: Flash flooding is actually occurring or imminent in the warning area. ![]() These watches are generally issued for flooding that is expected to occur at least six hours after heavy rains have ended.įlood Warning: Flooding conditions are actually occurring or are imminent in the warning area.įlash Flood Watch: Flash flooding is possible in or close to the watch area. It can also apply to heavy runoff or drainage of water into low lying areas. Severe Weather Watches and Warnings Flood Watch: High flow or overflow of water from a river is possible in the given time period. ![]()
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