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Rainfall accumulations across the Carolinas and surrounding states from October 1–4, ending at 6:24 p.m. EDT (22:24 UTC). Areas in white indicate accumulations in excess of 20 in (510 mm). Rainfall across parts of South Carolina reached 500-year event levels, [13] with areas near Columbia experiencing a 1-in-1000 year event. [14]
Ten-year floods have a 10% chance of occurring in any given year (P e =0.10); 500-year have a 0.2% chance of occurring in any given year (P e =0.002); etc. The percent chance of an X-year flood occurring in a single year is 100/X. A similar analysis is commonly applied to coastal flooding or rainfall data.
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".
So rare was Tuesday's rain between 5 p.m. and 8 p.m. in Sarasota that it should only be expected every 500 to 1,000 years. The Tampa Bay area can normally expect 7.3 inches in the entire month of ...
Lightning from this storm was detected as far as 50–60 mi (80–97 km) away from the center of the storm. [328] A supercell thunderstorm that struck Chicago , Illinois and surrounding areas on June 13, 2022 may have surpassed its height, being at least over 60,000 ft (18 km; 11 mi) and potentially reaching as high as 65,000–70,000 ft (20 ...
The county is currently using 500-year flood maps to indicate areas where residents should be ready to evacuate. "We are using the 500-year flood plain maps as kind-of a guide.
That’s a storm that NOAA says has a one-in-500 chance of happening in a given year. Floyd dropped 18.30 inches of rain on Southport in 1999, while Florence’s 31.26 inches of rain over four ...
Numerous rainfall records, both for most rain in the month of August as well as 24-hour rainfall totals were recorded. Over 457 mm (18 in) of rain was recorded in some locations during this week. At least $100 million in damages has been reported in Minnesota and Wisconsin alone, and 18 people were killed.