Flood and flash-flood watches are spread across Mississippi, Alabama and Florida, where 4 to 7 inches (10 to 18 centimeters) of rain could fall through early next week and reach into South Carolina, North Carolina and Tennessee expected to be hit by Alberto's remnants, the National Weather Service said.
The center said a tropical storm warning is in effect from the Suwannee River in Florida to the Mississippi-Alabama state line.
At its height, Alberto, the first storm of the 2018 Atlantic hurricane season, blasted sustained winds of 105km/h.
Flooding was possible in Florida's Miami-Dade and Monroe counties after weeks of rain, with tornadoes possible Saturday and Sunday and rip currents expected on both coasts, forecasters said.
A view of a partially flooded farm as Subtropical Storm Alberto passed by the west coast of Cuba, in Bahia Honda, Cuba, May 26, 2018.
Alberto is expected to drop 2 to 6 inches of rain through Thursday across much of the Southeast, with 12 inches possible in isolated areas.
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.
Alberto is moving north at 9 miles per hour. National Hurricane Center said.
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The latest advisory now has Alberto with winds of 35 miles per hour.
STORM SURGE: Water levels along the northeast Gulf of Mexico coast are receding, and will continue to do so overnight.
These periods of heavy rainfall could mean possible localized flooding, Allen said.
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.
Hurricane season doesn't officially begin until June 1, but Alberto apparently missed the memo.
Heaviest rains will likely occur during this afternoon/evening peak commute hours, so travel will be slowed and difficult/hazardous where storms are most intense.
Moore said the rainy weather late this month is expected to push the Columbia area past its average precipitation for May, typically one of the state's driest months. There is a heightened mudslide/rockslide threat in the mountains of western NC, as excessive rain has been the story over the last 7 to 10 days. However, showers and thunderstorms will make an appearance from Tropical Depression Alberto from the south and temperatures will be on a cooling trend throughout the rest of the week.