Storm clouds developing south of the U.S.-Mexico Border could bring thunderstorms to San Diego’s mountains and deserts Wednesday morning. NBC 7 Meteorologist Sheena Parveen said NBC 7’s Doppler Radar was seeing storms begin to push their way north into the Southern California region at about 8 a.m. No watches or warnings were in effect during that time, according to the National Weather Service. Fast-moving rain may hit areas of East County but will develop further east as the day progresses, Parveen said. Mostly, the monsoonal moisture from the south will bring heavy cloud cover to the area. Parveen said those clouds will be slow to clear.