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A 100-year flood is a flood event that has on average a 1 in 100 chance (1% probability) of being equaled or exceeded in any given year. [1] A 100-year flood is also referred to as a 1% flood. [2] For coastal or lake flooding, a 100-year flood is generally expressed as a flood elevation or depth, and may include wave effects. For river systems ...
A photogenic, highly-visible elephant-trunk tornado traveled slowly over open terrain, causing no damage. It was documented by numerous storm chasers. [3] EF0 NNE of Wanette: Pottawatomie: OK [to be determined] 04:10–04:12 1 mi (1.6 km) [to be determined] An EF0 tornado was confirmed by NWS Norman. Preliminary information. [5] EFU E of ...
The 2011 Missouri River floods was a flooding event on the Missouri River in the United States, in May and June that year. The flooding was triggered by record snowfall in the Rocky Mountains of Montana and Wyoming along with near-record spring rainfall in central and eastern Montana.
A '100-year flood' doesn't mean you'll be flood-free for the next 99 years. Win McNamee/Getty ImagesA 100-year flood, like a 100-year storm, is one so severe it has only a 1% chance of hitting in ...
The storm extended from Fort Ross on the coast to the Feather River basin. LaPorte, in the Feather River basin, had 1,458 mm (57.4 in) of rain in 20 days, an event with a return period of 12,000 years. The flood episodes of 1907 and 1909 in California resulted in an overhaul of planned statewide flood control designs.
The US government expects such storms could inflict $2 trillion worth of damage and a recovery effort that might drag out for months or years. A 100-year solar storm could fry our power grids ...
Tornado event data. Searchable Database of All US Tornadoes From 1950-present; Preliminary storm (tornadoes, severe wind and hail) reports from June 1, 1999 to present; and severe storm climatology information (SPC) Daily Severe Weather Report Archive from 1985-1999 (SPC) NCDC's searchable Storm Data database
Two 'thousand-year events' pummeled San Diego and Ventura. Officials say El Niño, climate change and seasonal patterns make similar storms more likely.