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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]
Flood forecasting is an important component of flood warning, where the distinction between the two is that the outcome of flood forecasting is a set of forecast time-profiles of channel flows or river levels at various locations, while "flood warning" is the task of making use of these forecasts to tell decisions on warnings of floods.
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 ...
Red weather alerts were issued on Wednesday evening in Valencia as more torrential rain hit areas already devastated by the previous flooding that left more than 220 people dead, with as much as ...
The National Weather Service said the atmospheric river has been directed away from flooded areas of northern California, providing beneficial rainfall across Central California into the Central ...
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 ...
The combination of drought-like conditions — Southern California has had less than 10% of average rainfall since Oct. 1 — and powerful offshore winds that hit the region Tuesday prompted fire ...