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September 22–23, 2000 – Tropical Storm Helene moved across Georgia and dropped rainfall across much of the state, with a peak total of 5.13 inches (130 mm) in Dunwoody. [ 4 ] June 11–13, 2001 – Tropical Storm Allison brought heavy rain and flooding to many counties in central and east central Georgia.
Douglasville received the most rain in 24 hours than any other city in metro Atlanta, the city received over 16.5 inches of rain on Sept 21, 2009. (The USGS calculated it to be a greater-than- 500-year flood ; the National Weather Service stated that chances of that much rain anywhere in the region are 1 in 10,000 years.)
The bars in the graph express the percent of the storm total rainfall, which is defined to be 100 percent in the final column. Note that, on average, as much as one-fourth of the total occurs in 2–3 hours, while half falls within 12 hours, and almost three-quarters of the storm total falls within a 24‑hour period.
Summer is the time of the second rainfall maximum during the year across Georgia, and the time of the main rainfall maximum in Florida. [46] [49] During the late summer and fall, tropical cyclones move into the region from the Atlantic and Gulf of Mexico, supplying portions of the area with one-quarter of their annual rainfall, on average.
Here's a look at the record for 1-day precipitation totals in Savannah (data provided by the National Weather Service). Savannah Greatest 1-day precipitation and rainfall records. Day.
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Harvey's storm total rainfall is the most recorded within the United States. [ 120 ] [ 121 ] Harvey's extremely heavy rainfall produced catastrophic flooding across much of southeastern Texas; particularly in and around the Houston metropolitan area , where accumulations exceeded 40 in (1,000 mm) over a four-day period. [ 120 ]
The 2-inch totals were seen all the way up into northern Walworth County around Whitewater and Elkhorn. The storm stayed mostly south of Madison, which saw about half an inch to 1 inch of rainfall.