Hidalgo and Starr counties can expect a half inch to an inch of rainfall through Wednesday, according to the National Weather Service in Brownsville.
Most of Cameron County can expect an inch to an inch and a half.
Some areas of the Rio Grande Valley could be inundated with more than 3 inches, based on “slow moving or strong cells,” according to an NWS post on Facebook.
The forecast stressed the uncertainty of “Disturbance 1,” an unorganized system in the southern Gulf of Mexico, which has a 60% chance of developing into a tropical depression or storm.
“Keep in mind that rainfall chances and forecast amounts may change as Tuesday and Wednesday draws closer,” they wrote in the post. “Locally heavy rainfall is expected Tuesday and perhaps extending into Wednesday.
“Despite the dry ground, local flooding will still be possible especially in poor drainage urban locations,” predicting areas with poor drainage could see one to two feet of water.