SAN DIEGO - A late-season storm with widespread showers and cooler temperatures started moving into San Diego County Thursday and was expected to add isolated thunderstorms and the possibility of mountain snow Friday.
Heavy showers could produce flash flooding as well as mud and debris flows, especially in recently burned areas and on steep terrain, according to FOX5 meteorologist Jason Handman . Flash flood watch in effect from Friday morning through the evening in the mountains and valleys.
The onset of much-needed precipitation in the drought-parched county -- the second wet spell to arrive in a week -- began Thursday around 1:30 p.m.
More than 1 inch of rain could fall in San Diego coastal areas, FOX 5 weathercaster Chrissy Russo said. El Cajon could get more than 2 inches of rainfall, and Ramona and Julian could receive 3 inches before the storm system moves out of the area Saturday, Russo said. Borrego Springs may get more than an inch as well, she said.
The storm will hit San Diego in two waves, Russo said, with the first wave hitting Thursday evening. The second wave is expected to arrive early Friday morning. It should bring the heaviest rain all Friday and into Saturday morning.
Snow will likely fall in mountain areas with altitudes higher than 6,000 feet, according to the National Weather Service.
Gusty wind is also expected Thursday in the mountains and deserts. A wind advisory for those areas will remain in effect until 8 p.m. West winds of 20 to 30 miles per hour are forecast along with gusts that may reach 55 mph, forecasters said.
The wind could cause hazardous driving conditions, especially along Interstate 8, the NWS said. Visibility along some desert roadways could be reduced by blowing sand and dust.