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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.
A massive area, where 2-8 inches of rain has fallen as of Wednesday afternoon from the storm, stretched from central Texas to western Alabama.
Köppen climate types of Georgia, using 1991-2020 climate normals. The climate of Georgia is a humid subtropical climate, with most of the state having short, mild winters and long, hot summers. The Atlantic Ocean on the east coast of Georgia and the hill country in the north impact the state's climate. [1]
Scientists said this week they see the unmistakable fingerprint of climate change in the flooding rain ahead of and during Hurricane Helene. Enormous rainfall totals took place over three days ...
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.
Rainfall rates downwind of cities are increased between 48% and 116%. Partly as a result of this warming, monthly rainfall is about 28% greater between 32 and 64 kilometres (20 and 40 mi) downwind of cities, compared with upwind. [117] Some cities induce a total precipitation increase of 51%. [118]