From the National Weather Service:
Tropical moisture moving into the area Sunday afternoon through Monday night bringing periods of heavy rainfall.
3+”/hour rainfall rates will be likely along and south of the Interstate 10 corridor leading to possible street flooding. Run up on the beaches will cause strong rip currents and beach flooding.
A tropical wave over the northern tip of the Yucatan Peninsula will move northwestward today and move back out over water. Currently the National Hurricane Center has a 10% chance of development through Wednesday. This feature should push deep tropical moisture into the area Sunday through Tuesday on breezy southeasterly winds. The greatest rain chances will be across the southern portions of the area with the most intense rainfall focused mainly south of the Interstate 10 corridor. Widespread accumulations of .75 to 1.5 inches across the northern portions of the area and 2 to 4 inches with higher isolated totals across the south. The focus should be on the intense rainfall rates Sunday PM-Monday evening which could lead to street flooding.