This image obtained from the National Oceanic and Atmospheric Administration shows Subtropical Storm Alberto in the Caribbean on May 25, 2018, giving an early kickoff to the Atlantic hurricane season one week ahead of schedule.
Alberto formed about 55 miles south of Cozumel, off of Mexico's Yucatan Peninsula, the Miami-based National Hurricane Center reported.
A cyclist tries to stay dry along Collins Ave. in Miami Beach, Fla. on May 25, 2018. Rain from Subtropical Storm Alberto is expected to will drench the Memorial Day weekend.
Mario Badia and his brother, Robert Badia, fish on the edge of a boat dock at Holiday Park as dark rain clouds loom in the distance in Davie, Fla. on May 25, 2018. Chances of rain, as forecast by the National Weather Service, are at 80 percent and 70 percent throughout the Memorial Day weekend.
Alicia Herrera,10, visiting from Germany doesn't let dark clouds ruin her day at beach in Fort Lauderdale, Fla. on May 25, 2018. A flood watch is expected for South Florida on Saturday morning as a result of Subtropical Storm Alberto.
Nicholas Filipich of Biloxi, Miss., shovels sand for sand bags into his grandfather's truck on May 24, 2018. Filipich was helping his grandfather prepare for expected heavy rains over the weekend.
Empty beaches and low-hanging clouds are shown on May 25, 2018, at Fort Lauderdale Beach in Fort Lauderdale, Fla. A storm kicking up in the Caribbean Sea is threatening to bring heavy rainfall and flash floods to parts of Mexico, Cuba, Florida and the eastern U.S. Gulf Coast this weekend and possibly beyond.
Empty beaches and low-hanging clouds are shown on May 25, 2018, at Fort Lauderdale Beach in Fort Lauderdale, Fla.
Signs advising drivers to turn on their lights and turn off their flashers while driving in the rain are shown on May 25, 2018, along Interstate 95 near Fort Lauderdale, Fla.