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A flash flood is a rapid flooding of low-lying areas: washes, rivers, dry lakes and depressions. It may be caused by heavy rain associated with a severe thunderstorm , hurricane , or tropical storm , or by meltwater from ice and snow .
Strong rains on 25 October and 4 November caused flash flooding and resulted in the deaths of at least 17 people, including five electrocuted when a tram power line collapsed into a puddle. [28] 5 November 2015: 3 rain storms Flash flooding occurred in the Jordanian capital Amman causing 3 deaths when a severe thunderstorm lasted over 30 minutes.
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. [2]
Flash floods put towns underwater and forced evacuations in Minnesota and Wisconsin. A strong system caused the heavy rain and flash flooding in the Upper Midwest. Some of the worse flooding came a week after the flood. Near record stage on the Minnesota River in New Ulm, Mankato, St Peter, Jordan, Shakopee, Savage, and breaking records in ...
A flash flood watch (SAME code: FFA; also referred as a "green box" by meteorologists) is severe weather watch product of the National Weather Service that is issued when conditions are favorable for flash flooding in flood-prone areas, usually when grounds are already saturated from recent rains, or when upcoming rains will have the potential ...
Flash flood emergency FFS – A flash flood emergency is a high-end usage of the flash flood warning. The flash flood emergency term is used when widespread flooding is occurring, and either, multiple water rescues have been reported in the past few hours, or if highly populated regions are undergoing significant flash flooding likely to cause ...
Flash flood guidance then is an index that indicates how much rainfall is needed to overcome soil and channel storage capacities and to cause minimal flooding in a basin. Flash Flood Threat is the amount of rainfall of a given duration in excess of the corresponding Flash Flood Guidance value. The flash flood threat when used with existing or ...
Flash flood in Ein Avdat, Negev, Israel. River flooding is often caused by heavy rain, sometimes increased by melting snow. A flood that rises rapidly, with little or no warning, is called a flash flood. Flash floods usually result from intense rainfall over a relatively small area, or if the area was already saturated from previous precipitation.