Maximum sustained winds were near 40 miles per hour with higher gusts.
"Heavy rains and gusty winds continue to spread northward over Florida", it tweeted.
The US states of Alabama, Florida and MS have declared an emergency ahead of subtropical storm Alberto expected to make landfall on Monday, authorities said.
A subtropical storm like Alberto has a less defined and cooler center than a tropical storm, and its strongest winds are found farther from its center.
Alberto has been a subtropical storm since its formation because it lacked the warm core that forms the core of tropical storms.
In response, Gov. Rick Scott has declared a state of emergency in all 67 Florida counties.
The National Weather Service has issued a flash flood watch for an area stretching from MS to North Carolina that is home to millions of people. Meanwhile, evacuations are already underway at T. H Stone Memorial St. Joseph Peninsula State Park and officials have issued voluntary evacuations for parts of Taylor County.
A storm surge watch is in effect from the Suwannee River to Navarre, in the Florida Panhandle.
A water spout, a risky vortex of wind and water, was spotted late Sunday about 7 miles off shore of Alligator Point, Florida, said Roth.
Mark Bowen, the Bay County emergency management director, suggested people stay safe - preferably indoors.
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The Tampa Bay area can expect tides 1-2 feet above normal, and above-average tides through midweek, and unsafe rip currents. Due to recent rains, grounds over much of the area are saturated and heavy rain could cause localized flooding issues.
Cuba is expected to get as much as 15 inches of rain, the hurricane center said in an advisory Saturday, and the Florida Keys and South Florida could get as many as 10 inches.
Jeffrey Medlin, meteorologist in charge at the National Weather Service's Mobile office, warned that even after the storm moves north there will still be swells coming up from the south that could cause unsafe rip currents. Just because it's "nice and sunny" after the storm passes, Medlin says, there's still a risk for swimmers.
Alberto is expected to travel across the eastern Gulf of Mexico Saturday night through Monday and approach the northern part of the Gulf where it could make landfall Monday night.
The center of Subtropical Storm Alberto will likely reach the northern U.S. Gulf Coast Monday afternoon or evening.
Alberto's projected storm track has shifted eastward since Friday, lessening its threat to the active oil production areas in the Gulf of Mexico. Forecasts for disorganized systems without a well-defined center are always less certain.
A gradual strengthening is expected through the weekend as it moves north.
Meteorologists expect a turn toward the north-northwest at a slower speed into Sunday. According to the paper, politicians at the time downplayed the storm's severity to keep tourists flocking to Florida as a vacation spot.
It is forecast to produce rainfall totals of 4-8 inches in the Florida Panhandle with isolated totals of 12 inches.
At 11a.m. EDT Sunday, the NHC said Alberto was about 130 miles southwest of Tampa, Florida, and moving north at 14 mph.