A winter weather warning is in effect for parts of San Diego County's mountain communities, with heavy snow and windy conditions expected Thursday.

Due to strong winds and hazardous road conditions, schools in Mountain Empire Unified School District will be closed Thursday for the safety of students and staff members.

The first in a series of Pacific storms moved into San Diego County on Wednesday and began spreading much-needed rain, before a second wave was expected to follow Thursday night into Friday morning. By the time the storm leaves Friday,

A weak atmospheric river storm that moved into San Diego County on Wednesday was expected to bring days of on-and-off rain, mountain snow and gusty winds, and it has been doing just that. Rain totals spread out over three days will add up to nearly an inch for coastal communities and some inland areas seeing more than that.

Weather Advisory was in effect for San Diego County's mountain communities Thursday with heavy snow and windy conditions expected.

Communities across the county are gearing up for the anticipated rain, with many taking proactive steps to safeguard their properties.

A weak atmospheric river is making its way to San Diego, bringing chances of rain, snow and high winds, the National Weather Service said. Widespread showers will start Wednesday afternoon and evening.