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

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

Despite conditions clearing, a heavy shower or thunderstorm could be in the forecast for southern parts of the county between 8 p.m. Friday and midnight, according to the National Weather Service.

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,

Showers and some thunderstorms are expected throughout San Diego County by the middle of the week with periods of gusty winds, the National Weather Service said Monday.

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.

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

County is set to experience an unsettled weather pattern this week, with rain, gusty winds and mountain snow forecast from Wednesday through Friday.

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.