"Steady weakening is forecast after landfall, and Alberto will likely become a subtropical depression tonight or early Tuesday and degenerate into a remnant low by Tuesday afternoon".
Subtropical Storm Alberto was disrupting plans for Memorial Day barbecues and beach outings in Alabama, Florida and MS, as the storm continued churning north through the Gulf of Mexico on Sunday. The Florida panhandle, a good portion of Alabama and western Georgia are dramatically more at risk for flash flooding with this storm.
In addition to parts of the southeastern USA, the heavy rains and storm conditions could produce "life-threatening flash floods and mudslides" in Cuba, the NHC said.
Combined with the above average rainfall we've already seen so far this spring, additional rain could create flooding issues in the upcoming week along area rivers.
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.
The National Weather Service's office in Tampa said in a briefing Saturday that winds from Alberto would increase late Saturday night, persisting during the day Sunday, then diminish later Sunday night.
Flash flood watches are in effect for parts of several states from Alabama through Tennessee, Kentucky, Illinois, the Carolinas and Virginia and West Virginia. Forecasters predicted it would move into Alabama after that. "It was a constant rain but not a heavy rain", said Regina Myers, emergency management director in Walker County northwest of Birmingham.
Alberto is the first named storm of the 2018 hurricane season - a season that doesn't formally begin until June 1, the National Hurricane Center says.
Thousands of Florida residents evacuated their homes today as Subtropical Storm Alberto drove north through the Gulf of Mexico with forecasters saying it could bring "life-threatening inundation" to southern coastal states. I think we stay mainly cloudy on this Memorial Day.
Tropical-storm force winds will continue in the Panhandle.
"The main concern from Alberto is flooding; not so much along the immediate coast, but inland, from the heavy rains that are coming on top of over a week of rain across the southeast", said Chuck Watson, a disaster modeler at Enki Research in Savannah, Georgia.