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First Alert Weather: The difference between Tropical and Subtropical Storms

31 May 2018

Alberto is expected to cause heavy rains in South Florida and the Florida Keys while a tropical storm watch is in effect for parts of MS and Alabama.

The storm's maximum sustained winds had reached 65 miles per hour Sunday night - but although it lost strength, National Hurricane Center meteorologist David Zelinsky told NPR there was no reason to relax. Expect similar conditions in North Alabama on Tuesday as the center of the storm moves overhead; a Flash Flood Watch is in effect though noon Wednesday.

Forecasters said Alberto could bring risky high water to southern coastal states when it douses an area from MS to western Georgia with up to 30cm of rain and possible tornadoes. The Florida panhandle, a good portion of Alabama and western Georgia are dramatically more at risk for flash flooding with this storm.

Alberto had picked up strength as it headed north through the Gulf of Mexico, bringing with it the warning of life-threatening inundation, said the Miami-based hurricane centre. Forecasters said the subtropical depression swirling near Birmingham, Ala., could dump as much as 6 inches of rain to the middle of Alabama.

"Most of the tropical storms die out itself then it actually turns into a low pressure system", Mott said. Warnings about storm surges and high surf were aired along the coast on either side of Apalachicola on Monday.

These periods of heavy rainfall could mean possible localized flooding, Allen said.

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Because of the predicted landfall area, Lee County and surrounding areas could potentially experience "tropical weak tornadoes", Allen said, because of the county's location in relation to the storm.

More than 5,000 were evacuated in Cuba over the subtropical storm.

Alberto got an early jump on the 2018 hurricane season, which doesn't officially start until Friday.

Alberto was moving slowly up the Gulf coast, traveling at 8 miles per hour, up from 6 miles per hour at the 8 a.m. advisory. Grant Brown, the city's public information officer, said they had already finished a number of preparations such as clearing culverts to prepare for big rains but Sunday had turned into a "really nice day".

Alberto has been a subtropical storm since its formation because it lacked the warm core that forms the core of tropical storms.

The one band of storms that moved through Volusia and Flagler counties Sunday morning delivered not quite a half inch of rain at Daytona Beach International Airport and anywhere from 1.3 to 1.5 inches of rainfall in parts of Flagler County, according to Skywarn spotters there.

First Alert Weather: The difference between Tropical and Subtropical Storms