Southern San Diego County could receive heavy rain starting late Monday morning from a modest Pacific storm that’s drawing moisture from the sub-tropics, according to the National Weather Service.
Forecasters say the two pools of moisture could combine off Baja California and gain strength by the time the plume hits the U.S.-Mexico border. The showers will start off light, but could intensify into the afternoon and evening.
The weather service says South County coastal areas could get from one-half to 1 inch of rain, while South County valleys get 0.75 inches to 1.5 inches. Up to 2 inches could fall in South County mountains.
The weather service says in an advisory that there is a “small potential for flooding issues for the San Diego river at Fashion Valley as well. Local urban and small stream flooding possible.
“The Tijuana River watershed south of the border may get 1 to 2 inches of rain in a 12 hour period and 1.5-3 inches in a 24 hour period.”
Since the rainy season began on October 1st, San Diego International Airport has recorded 9.22 inches of rain, which is 2.10” inches above normal. Ramona Airport has recorded 16.36 inches, which is 6.14 inches above normal.