And on Sunday night and Monday, the rainfall and flooding could spread over much of the southeast U.S.
Of those, the NOAA is forecasting that five to nine of the storms will form into hurricanes with winds of 74 miles per hour or above.
Subtropical storms can strengthen into tropical storms, but Alberto is not expected to do so before reaching land, and will quickly weaken after landfall.
Another 1 to 2 inches of rain is expected through Sunday in the Manatee-Sarasota area, though specific areas could receive much more.
Subtropical Storm Alberto pushed north along the western coast of Florida on Sunday, May 27, churning up the ocean and creating beach erosion.
Alberto brings little rain to Volusia/Flagler area
Tonight mostly dry conditions are expected across our inland zones after midnight.
Alberto - the first named storm of the 2018 hurricane season - was continued roiling toward parts of coastal Mexico and Cuba with rip currents and unsafe surf on Saturday.
There's a chance Alberto could come ashore early Monday, said Dan Pydynowski, a meteorologist with AccuWeather Inc.in State College, Pennsylvania.
A more widespread area of rain and embedded storms will arrive early Tuesday and last all day before Alberto moves north of Alabama by Wednesday. Lifeguards posted red flags along the white sands of Pensacola Beach, where swimming and wading are banned due to high surf and unsafe conditions. According to the paper, politicians at the time downplayed the storm's severity to keep tourists flocking to Florida as a vacation spot.
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.
The National Hurricane Center says that Alberto now has top sustained winds of 65 miles per hour (100 kph) but that little further strengthening is expected before Alberto reaches the Gulf Coast sometime Monday.
A tropical storm warning remains in effect for an area stretching from Florida's Suwannee River to the border of Alabama and Mississippi.
In the Baltimore suburb of Ellicott City, a massive storm caused flash flooding on Sunday that swept through its historic Main Street area, local news video showed.
Heavy downpours were expected to begin lashing parts of Florida, Louisiana, Mississippi and Alabama on Sunday.
Heavy rain has already fallen in southern states, and flood and flash-flood watches span the region, reaching as far north as North Carolina and Tennessee, the National Weather Service said.
The center also has discontinued all storm surge warnings for most of the state's peninsula.
One of the four storms could turn into major hurricanes.
Between Hurricane Harvey in Texas, Irma in the Caribbean and southeastern US and Maria in Puerto Rico, past year was one of the most active hurricane seasons on record, said The National Oceanic and Atmospheric Administration. Parts of Cuba could see 10 to 15 inches of rain, with isolated totals of 25 inches across western Cuba, the hurricane center said.