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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 forecast rainfall then is an index that provides an indication of areas where flooding is imminent or occurring and where immediate action is or will be shortly needed.
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]
Data extrapolation, including development or dissipation, can be used to find the likely location of a moving weather system. The intensity of rainfall from a particular cloud or group of clouds can be estimated, giving a very good indication as to whether to expect flooding, the swelling of a river etc. Depending on the area of built-up space, drainage and land-use in general, a forecast ...
In wake of last month's devastating floods at Yellowstone National Park, weather experts call for changes in the way the government issues forecasts. Yellowstone floods reveal need to fix ...
Get the Garrett, WY local weather forecast by the hour and the next 10 days.
Hundreds of miles apart, but still connected by the same stubborn weather system, urban St. Louis and rural Appalachia are showing how devastating flash flooding can be when souped-up storms dump ...
Particularly dangerous situation flash flood warning FFW – Issued within the initial flash flood warning or as a complete re-issuance of the previously issued warning, this indicates widespread, life-threatening flash flooding—caused by excessive rainfall, ice jams or imminent dam failures—has been indicated by Doppler weather radar ...
Zone V homes are in coastal regions and may be exposed to flash floods, hurricanes and other weather that can lead to water exposure and weather-related hazards. The highest-risk areas are defined ...