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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 ...
For example, a 10-year flood has a 1/10 = 0.1 or 10% chance of being exceeded in any one year and a 50-year flood has a 0.02 or 2% chance of being exceeded in any one year. This does not mean that a 100-year flood will happen regularly every 100 years, or only once in 100 years. Despite the connotations of the name "return period".
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 ...
Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
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 US government expects such storms could inflict $2 trillion worth of damage and a recovery effort that might drag out for months or years.
It was the strongest storm to hit the islands in more than 90 years, Meteo-France said. Chido then continued into northern Mozambique where it continued to cause damage, though the storm has now ...
The following is a list of major snow and ice events in the United States that have caused noteworthy damage and destruction in their wake. The categories presented below are not used to measure the strength of a storm, but are rather indicators of how severely the snowfall affected the population in the storm's path.