A tropical storm warning is NO LONGER IN EFFECT south of the Suwannee River, so the Tampa Bay area is now in the clear.
Storm Alberto has continued roiling toward parts of coastal Mexico and Cuba with rip currents and unsafe surf on Saturday.
Hurricane season doesn't officially begin until June 1, but Alberto apparently missed the memo.
Alberto, which spun up days before the formal start of the 2018 hurricane season, was moving north at about 20 kilometres per hour with maximum sustained winds near 64 kilometres per hour, and higher gusts, on Saturday, the NWS said.
By midday on Sunday, the storm was about 240 miles (386 km) northwest of Key West, Florida, according to the US National Hurricane Centre (NHC).
The NHC defines subtropical storm as a "subtropical cyclone" in which the maximum sustained wind speed - using the US one-minute average - is 39 miles per hour or higher.
The center of Subtropical Storm Alberto will likely reach the northern U.S. Gulf Coast Monday afternoon or evening.
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Authorities say conditions are especially unsafe with flooding rains coming overnight and on a holiday weekend when many people have outdoor plans.
The National Weather Service says the ground is already saturated from a week of heavy rain and the 5 inches of rain possible through Tuesday could both cause creeks and rivers to flood and mudslides. Lifeguards posted red flags along the white sands of Pensacola Beach, where swimming and wading are banned due to high surf and risky conditions.
Gusty showers were to begin lashing parts of Florida on Sunday, and authorities were warning of the possibility of flash flooding. The tropical system became a subtropical storm Friday, the hurricane center said.
Franklin County, in the Florida Panhandle, has issued a mandatory evacuation for its barrier islands in the Gulf of Mexico affecting some 4,200 housing units, while Taylor County, to the east, has a voluntary evacuation order in place for its coastal areas.
In response, Gov. Rick Scott has declared a state of emergency in all 67 Florida counties. Flood warnings and other tornado warnings were issued there Sunday night. Meteorologists are calling it a "subtropical storm", not to be confused with the just plain tropical storms we know and dread. Little if any strengthening is expected before Alberto reaches the northern Gulf Coast.
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.
A tropical storm watch means that tropical storm conditions are possible for the area and time frame described. Some of the rain maybe heavy at times.