The National Weather Service has issued an area flood advisory for parts of Cameron County until 4:45 p.m.
Forecasters say Doppler Radar indicates the thunderstorms are producing two to three inches of rain.
Heavy rain is making its way through southwestern Cameron County in the areas of San Pedro, Rancho Viejo and the surrounding communities. Hail the size of quarters is reported in the storm that is moving north at 15 mph.
An additiona one to two inches of rain is possible this afternoon.