Up to an inch of warm rain is expected throughout Santee and the county Friday ahead of cooler but more scattered wet weather this weekend, forecasters said.
A low pressure trough about 400 miles west of San Diego will draw warm, moist subtropical air into Southern California through this evening, according to the National Weather Service. The agency said there would be brief periods of heavy rain and isolated thunderstorms as the chance of rain increases throughout the day.
"The rain chances will increase tonight and remain high through tonight as the center of the trough moves closer," according to an NWS advisory. "Rain chances decrease Saturday as the trough moves east."
The weather service said there will still be showers on Saturday behind the trough but the rain will not be as widespread as today. Most of the showers Saturday will be over the mountains, according to the weather service. Santee's chances of rain over the weekend vary from 20-40 percent.
"On Sunday and Monday, a second, colder low pressure trough from the north will bring cooler, breezy weather and a chance of showers," forecasters said. "However, this is a drier system so the showers will be less widespread. Greatest impacts from this second system will be the colder weather, gusty winds and lower snow levels down to 4,000 feet by Monday morning."
-City News Service
Santee NWS Weather Forecast
Friday: Showers, with thunderstorms also possible after 10am. High near 66. Chance of precipitation is 100%.
Friday night: Showers and possibly a thunderstorm. Low around 56. Chance of precipitation is 80%.
Saturday: A 30 percent chance of showers, mainly before 10am. Mostly cloudy,with a high near 62.
Saturday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 53.
Sunday: A 40 percent chance of showers. Mostly cloudy, with a high near 59.
Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 45.