Rain is finally back in the San Francisco Bay Area forecast

After more than two weeks of bone-dry weather, the San Francisco Bay Area might finally see rain this week.

A cold front dropping down from Canada is bringing a 60 percent chance of showers between Tuesday at 10 p.m. and Wednesday at 4 a.m. There's a 20 percent chance of light drizzle during the Wednesday morning commute.

Urban areas are expected to receive about a tenth of an inch of rain, with some isolated spots getting up to a quarter-inch, especially in the coastal and North Bay mountains, according to the National Weather Service.

Cities to the south such as San Jose might see less than a tenth of an inch.

The National Weather Service's precipitation forecast for Tuesday and Wednesday at locations around California. The National Weather Service's precipitation forecast for Tuesday and Wednesday at locations around California. Photo: National Weather Service Photo: National Weather Service Image 1 of / 12 Caption Close Rain is finally back in the San Francisco Bay Area forecast 1 / 12 Back to Gallery

"It's traveling across land and not coming across the ocean and collecting moisture, and that's why it's a relatively dry storm," says Steve Anderson, a meteorologist with the National Weather Service office in Monterey. "It's not going to bring a lot of rain. It might get the streets wet during the morning commute, and that's about it."

Temperatures will drop Tuesday night into the mid-30s inland and 40s on the coast, and on Wednesday afternoon dry conditions will return with highs in the 50s. Wednesday night will be chilly with lows in the 20s and 30s inland and in the 40s on the coast.

Northern California has seen unseasonably dry weather in December as a high-pressure ridge has hunkered down along the entire West Coast, blocking moisture-carrying Pacific storms.

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. . Photo: Instagram / Eachplacearhaposdy Photo: Instagram / Eachplacearhaposdy Image 1 of / 58 Caption Close Unusual weather around California: 2017 1 / 58 Back to Gallery

This cold front will move along the backside of the high-pressure ridge that Anderson says will continue to remain in place.

After the quick shot of rain, the seven-day forecast shows conditions staying dry through Christmas.

UCLA meteorologist Daniel Swain told SFGATE previously that these high-pressure systems, which he calls "ridiculously resilient ridges," are stable and tend to persist for long periods of time.

"During the five-year drought, the ridiculously resilient ridge was a defining characteristic from an atmospheric perspective," Swain says. "We saw a three-week stretch and and then another and another, and they'd be broken by moderate storms."

At this point, meteorologists are uncertain whether we're in a similar pattern.