Alberto made a Memorial Day landfall near Laguna Beach, Fla, just west of Panama City, andofficials warned of risky conditions even though its maximum sustained winds fell to 45 miles per hour.
Elsewhere, officials in Howard County in Maryland said a 39-year-old man was missing after flash flooding from a separate storm tore through the historic downtown of Ellicott City on Sunday.
We will have to watch the far eastern side of Alabama today once we get a little heating and the atmosphere destabilizes because storms that form could produce strong wind gusts or even spin up tornadoes.
A FLASH FLOOD WATCH is in effect through the evening hours.
Elsewhere, Florida's Division of Emergency Management said, about 2,600 customers were without power in northwestern Florida on Monday morning.
To the north, Alberto lumbered ashore in the Panhandle, pelting white sand beaches with blustery winds and stinging rain.
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Remnants of the storm could bring showers and thunderstorms to Pennsylvania on Wednesday and into Thursday, according to National Weather Service meteorologist David Martin. The storm packed sustained winds of 45 miles per hour.
Lawmakers are warning this is only the start of the Atlantic hurricane season. What had sprung up from the Gulf of Mexico as a subtropical storm was now a vast, soggy system trekking inland as it flung rain - heavy at times - all around the Southeast.
Subtropical storm Alberto has fizzled into a subtropical depression as it rolled into Alabama, however forecasters warned of potentially risky flash floods even as winds dropped to 48km/h.
The Tropical Storm Warning from the Aucilla River to the Okaloosa/Walton County line has been discontinued.
Forecasters said Alberto could bring risky high water to southern coastal states when it douses an area from MS to western Georgia with up to 12 inches of rain and possible tornadoes. "399 between Pensacola Beach and Navarre Beach".
For those who wish to dip their toes in the water this week, be warned: Strong breezes will produce above-normal waves, ranging from 2 to 4 feet, and unsafe rip currents through midweek, forecasters said. "We've never seen one before and we're here celebrating a friend's 20th birthday", Rhumes told the Daily News. And in the Tampa Bay area on the central Gulf Coast, cities offered sandbags for homeowners anxious about floods.
"The combination of storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline", the NHC said, with water potentially reaching 1 to 3 feet above ground if the peak surge occurs during high tide.