A tropical storm formed Thursday morning in the southeastern Gulf of Mexico with winds of 60 mph, according to the National Hurricane Center.
A hurricane watch is in effect from Grand Isle, La., to Indian Pass in the Florida Panhandle. A tropical storm watch also is in effect for parts of the Louisiana coast west of Grand Isle, including the metro New Orleans area and Lake Pontchartrain.
The storm, named Karen, is responsible for the sogginess in South Florida and is moving north-northwest at 13 mph and could reach hurricane strength by Friday.
An urban flood advisory remains in effect for portions of Miami-Dade until 11:15 a.m. Thursday. Areas affected included Kendall and South Miami. A flash flood warning was in effect overnight until until 4:30 a.m. for areas including Pinecrest and Kendall.
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Heavy rain stopped around 2:30 p.m., according to the National Weather Service, but "floodwaters will take a while to recede."
Pinecrest, the Falls area and Kendall Drive also have seen flooding, with several apartment complexes reporting flooding in parking lots and units.
Thursday started out with just a few showers off Northeast Miami-Dade and Miami Beach, pushing toward downtown Miami.
More storms are expected in the afternoon. The root cause? Moisture associated with the storm as it moves into the Gulf of Mexico and possibly affects the Florida Panhandle.
This report will be updated as more information becomes available.