
A sudden flood of water resulting from a cloudburst.
Found on
http://camposaur.com/camping-glossary/

A flash flood is a rapid flooding of geomorphic low-lying areas: washes, rivers, dry lakes and basins. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, tropical storm, or meltwater from ice or snow flowing over ice sheets or snowfields. Flash floods may occur after the collapse of a natural ice or debris dam, or a h...
Found on
http://en.wikipedia.org/wiki/Flash_flood

A flood that occurs within a few hours (usually less than six) of heavy or excessive rainfall, dam or levee failure.
Found on
http://ggweather.com/glossary.htm

A flood that rises and falls quite rapidly with little or no advance warning, usually as the result of intense rainfall over a relatively small area. Flash floods can be caused by situations such as a sudden excessive rainfall, the failure of a dam, or the thaw of an ice jam.
Found on
http://www.avon-weather.com/glossary.html

(from the article `flood`) The discharge volume of an individual stream is often highly variable from month to month and year to year. A particularly striking example of this ...
Found on
http://www.britannica.com/eb/a-z/f/34

A sudden flood of great volume, usually caused by a heavy rain. Also, a flood that crests in a short length of time and is often characterized by high velocity flows. It is often the result of heavy rainfall in a localized area.
Found on
http://www.encyclo.co.uk/local/21804

A flood that occurs within a few hours (usually less than six) of heavy or excessive rainfall, dam or levee failure or water released from an ice jam.
Found on
http://www.encyclo.co.uk/local/22268

Flooding caused by a rapid rise in the water level of rivers, streams, or lakes, usually as a result of heavy rains.
Found on
http://www.metcheck.com/OTHER/glossary.asp

A rapid and short-lived increase in the amount of runoff water entering a stream resulting in a flood.
Found on
http://www.physicalgeography.net/physgeoglos/f.html

a sudden flood of water down a normally dry river bed, caused by a rainstorm some distance upstream. The chance timing of spatially separated rainstorms over a catchment area, may add up to an unpredictable flash flood where rivers meet.
Found on
http://www.seafriends.org.nz/books/glossary.htm

A flood which is caused by heavy or excessive rainfall in a short period of time, generally less than 6 hours. These conditions are often produced by slow moving thunderstorms or tropical systems which make landfall.
Found on
http://www.stormfax.com/wxwords.htm

A flood that occurs within a few hours (usually less than six) of heavy or excessive rainfall, dam or levee failure or water released from an ice jam
Found on
http://www.timeanddate.com/weather/glossary.html

[
n] - a sudden local flood of great volume and short duration
Found on
http://www.webdictionary.co.uk/definition.php?query=flash%20flood

A flood caused by heavy or excessive rainfall in a short period of time, generally less than 6 hours. A flash flood rises rapidly, often with little or no warning.
Found on
https://www.encyclo.co.uk/local/21131

Flood of water in a normally arid area brought on by a sudden downpour of rain. Flash floods are rare and usually occur in mountainous areas. They may travel many kilometres from the site of the rainfall. Because of the suddenness of flash floods, little warning can be given of their occurrence. In 1972 a flash flood at Rapid City, South Dakota, US...
Found on
https://www.encyclo.co.uk/local/21221

A flood which is caused by heavy or excessive rainfall in a short period of time, generally under 6 hours, leading to water that rises and falls quite rapidly. The term may also be used to alert the public of non life threatening flooding of small streams, streets, storm drains, and low lying urban areas. A flash flood can also be caused by the fai...
Found on
https://www.encyclo.co.uk/local/22280

A flood that rises and falls very rapidly.
Found on
https://www.encyclo.co.uk/local/22327

Sudden flood of water, often heavily-laden with sediment, produced by sudden storms, especially in hot desert regions.
Found on
https://www.geolsoc.org.uk/ks3/gsl/education/resources/rockcycle/page3451.h

a sudden and destructive rush of water down a narrow gully or over a sloping surface, caused by heavy rainfall.
Found on
https://www.infoplease.com/dictionary/flash-flood
No exact match found.