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The nearly month-long tule fog bank that's settled over the Central Valley has consistently spilled into the North Bay and Santa Rosa Plain through the San Francisco Bay's lowlands.

It's brought a blanket of clouds and cold temperatures in the low 40's to much of central Sonoma County,

Rachel Kennedy is a meteorologist at National Weather Service Bay Area forecast center. She said rain is on the way.

“So over the next about 24-to-48 hours, we do have a weak system moving through, we’re going to see between a quarter of an inch to about a third of an inch in the coastal mountain ranges,” Kennedy told KRCB News on Tuesday afternoon.

Kennedy said more rainfall is expected later in the week.

“This system between late Thursday and Saturday is going to give between anywhere from an inch to...an inch and a half across the lower valleys and then between an inch and a half to two and a half inches across the coastal mountain ranges,” Kennedy said.

She said there is some expected change in temperatures.

“It's still going to be cool, but it's going to be more seasonally cool compared to the below normal coolness we've been seeing,” Kennedy said. “The system should help to get rid of the fog that we've had lingering over us for the last couple of weeks.”

To the east, Kennedy said the Sierra Nevada mountains will start to see some of the precipitation as well.

“At the very least, those snow lines are going to start out higher around 9,000 to 10,000 ft” Kennedy said. “ But as we kind of move through the week and next week, we're going to look or maybe a bit more snow across the mountains and seeing those snow levels gradually lowering.”

Kennedy recommended getting an early start on home storm prep, with a stronger storm system forecast for the Christmas holiday week.