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A USGS model image shows the enormous atmospheric river that may have been present during the 1861–1862 flood event.. The ARkStorm (for Atmospheric River 1,000) is a hypothetical megastorm, whose proposal is based on repeated historical occurrences of atmospheric rivers and other major rain events first developed and published by the Multi-Hazards Demonstration Project (MHDP) of the United ...
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.
Under the oversight of that branch, the Bureau began issuing flood warnings and fire weather forecasts, and issued the first daily national surface weather maps; it also established a network to distribute warnings for tropical cyclones as well as a data exchange service that relayed European weather analysis to the Bureau and vice versa. [19]
A flood watch has been issued for Adams, Lebanon and York counties as heavy rain is expected to fall this weekend. The National Weather Service says that the area could receive anywhere from 1.5 ...
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.
The good news, is that most of the flood watches were set to expire by 10 a.m. PT. After one last burst of rain was expected to move through southern California, conditions are expected to improve ...
Here are maps showing some of Northern California’s most populated areas within a tsunami hazard zone, as determined by the California Geological Survey. The yellow section indicates the tsunami ...
Today's U.S. Topo quadrangle (1:24,000) maps are mass-produced, using automated and semiautomated processes, with cartographic content supplied from the National GIS Database. [34] In the two years from June 2009 to May 2011, the USGS produced nearly 40,000 maps, more than 80 maps per work day. [34]
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