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A Flash Flood is a rapid flooding of geomorphic low-lying areas (washes), rivers and streams, caused by the intense rainfall associated with a thunderstorm, or multiple training thunderstorms. Flash floods can also occur when ice jams block the normal course of a river, or when a man-made structure, such as a dam, collapses, e.g., the Johnstown Flood of 1889. Flash flooding occurs when the ground becomes saturated with water that fell so quickly that it could not be absorbed. The runoff collects in low-lying areas and rapidly flows downhill. Flash floods most often occur in normally dry areas that have recently received precipitation, but may be seen anywhere downstream from the source of the precipitation (even dozens of miles from the source). Image File history File links Download high resolution version (821x1231, 323 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Flash flood User:Moondigger ...
Image File history File links Download high resolution version (821x1231, 323 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Flash flood User:Moondigger ...
A photographer in Upper Antelope Canyon Wikimedia Commons has media related to: Antelope Canyon Antelope Canyon is the most-visited and most-photographed slot canyon in the American Southwest. ...
Red sandstone interior of Lower Antelope Canyon, Arizona, worn smooth due to erosion by flash flooding over millions of years Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock grains. ...
Picture of flooding in Amphoe Sena, Ayutthaya Province, (.)(.) For other uses, see Flood (disambiguation). ...
Surface of the Earth Geomorphology is the study of landforms, including their origin and evolution, and the processes that shape them. ...
For other uses, see River (disambiguation). ...
Butchers Creek, Omeo, Victoria A stream, brook, beck, burn or creek, is a body of water with a detectable current, confined within a bed and banks. ...
For the singer, see Rain (singer). ...
A shelf cloud associated with a heavy or severe thunderstorm over Enschede, The Netherlands. ...
In meteorology, training is when a successive series of showers or thunderstorms moves repeatedly over the same area, usually causing some form of flooding, especially flash floods. ...
This article or section does not cite its references or sources. ...
The Johnstown Flood disaster (or Great Flood of 1889 as it became known locally) occurred on May 31, 1889. ...
In popular music an album Saturate by Breaking Benjamin. ...
Impact of a drop of water. ...
Absorption, in chemistry, is a physical or chemical phenomenon or a process in which atoms, molecules, or ions enter some bulk phase - gas, liquid or solid material. ...
Run-off, composed of a mixture of water and soil along with any other organic or inorganic substances that may exist in the land, is the product of precipitation, snowmelt, over-irrigation, or other water coming in contact with the earth and carrying matter to streams, rivers, lakes, and other...
The U.S. National Weather Service gives the advice "Turn Around, Don't Drown" in reference to flash floods; that is, it recommends that people get out of the area of a flash flood, rather than trying to cross it. Most people tend to underestimate the dangers of flash floods. The National Weather Service (NWS) is one of the six scientific agencies that make up the National Oceanic and Atmospheric Administration (NOAA) of the United States government. ...
Flash floods are extremely dangerous because of their sudden nature. Being in a vehicle provides little to no protection against being swept away; it may make people overconfident and less likely to avoid the flash flood. More than half of the fatalities attributed to flash floods, are people swept away in vehicles when trying to cross flooded intersections [1]. As little as two feet of water can be enough to carry away most SUV-sized vehicles [2]. In the United States, the National Weather Service (part of NOAA) reported in 2005 that, using a national 30-year average, more people die yearly in floods (127 on average) than by lightning (73), tornadoes (65), or hurricanes (16). The National Weather Service (NWS) is one of the six scientific agencies that make up the National Oceanic and Atmospheric Administration (NOAA) of the United States government. ...
The National Oceanic and Atmospheric Administration (NOAA) is a scientific agency of the United States Department of Commerce focused on the conditions of the oceans and the atmosphere. ...
Double lightning. ...
A tornado in central Oklahoma. ...
This article is about weather phenomena. ...
The desert southwestern U.S. is especially dangerous for both hikers and vehicles from the sudden onslaught of water from isolated thunderstorms. These rains fill poorly-absorbent and often claylike dry riverbeds. A moving flood will usually be headed by a debris pile that may have wood branches and/or logs. Deep slot canyons can be especially dangerous to hikers as they may be flooded by a storm that occurs on a mesa miles away, sweeping through the canyon, making it difficult to climb up and out of the way to avoid the flood. Valley roads frequently cross dry river and creek beds without bridges. From the driver's perspective, there may be clear weather, when unexpectantly a river forms ahead of or around the vehicle in a matter of seconds. [3] Photographers in Antelope Canyon. ...
Historical examples Lynmouth is a village in Devon, England. ...
1952 (MCMLII) was a Leap year starting on Tuesday (link will take you to calendar). ...
A photographer in Upper Antelope Canyon Wikimedia Commons has media related to: Antelope Canyon Antelope Canyon is the most-visited and most-photographed slot canyon in the American Southwest. ...
Location within the British Isles Boscastle (Cornish: Kastell Boterel) is a small town on the north coast of Cornwall, in the extreme southwest of Britain. ...
Looking upstream from the bridge after the flood Looking at the Old Cornish Stores Shop Wikimedia Commons has media related to: Boscastle flood, 2004 The Boscastle flood, 2004 occurred on Monday 16 August 2004 in Boscastle, Cornwall. ...
See also A flash flood (also a freshet, considered archaic) is a rapid flooding of low-lying areas, rivers and streams that is caused by the intense rainfall associated with a thunderstorm, or multiple training thunderstorms. ...
A huayco or huaico (from the Quechua wayqu, meaning depth, valley) is a Peruvian term that refers to a flash flood caused by torrential rains occurring high in the mountains. ...
References
Further Reading - Schmittner Karl-Erich and Giresse Pierre, 1996. Modelling and application of the geomorphic and environmental controls on flash flood flow. Geomorphology 16/4:337-347.
External links - Turn Around Don't Drown – a public education safety initiative for flash flooding
- Decision tree to choose an uncertainty method for hydrological and hydraulic modelling, choosing an uncertainty analysis for flood modelling.
- http://www.rankinstudio.com Great footage of flash floods in the arid midwest heading down dry washes after heavy rain.
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