Slightly unusual 'atmospheric river' event to hit Southeast U.S.

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Slightly unusual 'atmospheric river' event to hit Southeast U.S.
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The National Oceanic and Atmospheric Administration says an 'atmospheric river' event is set to hit Florida and other parts of the Southeast. The weather event typically occurs in the West.

Beginning this weekend into Monday and Tuesday, widespread rainfall across the region could result in 4 to 6 inches of rain, the National Weather Service said. Isolated spots are expected to see as much as 12 inches of rain.

Florida, Tennessee, Georgia, South Carolina, and North Carolina are forecast to see most of the effects of the atmospheric river.The chances of rain in the area"will increase later this weekend, with the potential for heavy rainfall Monday through Tuesday, which could result in flooding," An atmospheric river is, essentially, a concentrated area of water vapor that transports large amounts of water through the sky. They usually come from the Gulf of Mexico or the Caribbean and land in the Western U.S. But not this time. "California gets a lot of precipitation in the winter from these," said Andrew Hazelton an associate scientist at the University of Miami, where he works with NOAA. But it's not rare for atmospheric rivers to land in areas outside of California, he said. They typically happen because of a"cutoff low," according to Hazelton — when the jet stream from the Gulf of Mexico or the Caribbean gets cut off. This cutoff leads to a diversion. It turns the jet stream into a closed-off low-pressure system. Where many atmospheric river events hit straight from East to West, the closed off low pressure routes back East.Today's weather will be mostly quiet, but rain chances will increase later this weekend, with the potential for heavy rainfall Monday through Tuesday, which could result in flooding. Check back often withCertain areas in Florida, including Central Florida, had a dry winter and are witnessing a drought. More precipitation in these locations could make up for the harsh cold season. "When you get too much rain in a short period of time, it can be a flooding and flash flood threat," Hazelton said."So, I would keep an eye on that, but hopefully it'll be more beneficial."For areas that are prone to flooding, the same precautions for any other high-precipitation event still stand. "Always remember to turn around, don't drown," Hazelton said about the atmospheric river event that could lead to flooding in certain areas."If you happen to be out and there's a flash flood, don't try to go through it — because that's the thing. Just a couple of inches of water can knock you off your feet. Be safe and stay on high ground till the water subsides."

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