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Bay Area Forecast: Lingering Showers Friday, Atmospheric River Coming This Weekend

NBC Universal, Inc. Forecaster Vianey Arana tracks a break in the rain before a stronger system takes aim at the Bay Area in your Microclimate Forecast.

Another round of much-needed rain fell on the Bay Area late Thursday into Friday, but the biggest rainfall amounts are expected on Sunday into Monday via an atmospheric river that could bring up to 9 inches of rain to some elevated parts of the region.

Widespread rain that soaked the Bay Area during the Friday morning commute – causing some issues such as roadway flooding in spots – cleared by noon. A few lingering showers were possible through the afternoon, according to the National Weather Service.

Highs on Friday will be in the upper 50s to the mid 60s. Friday night will be mostly cloudy. There will be a slight chance of rain after midnight. Lows will be in the mid 50s.

Saturday will be mostly cloudy. There will be a slight chance of rain in the morning and a chance of rain in the afternoon. Highs will be in the upper 50s to mid 60s.

The most serious storm will come later in the weekend, with the atmospheric river possibly bringing 6 to 9 inches of rain in areas like the North Bay mountains and up to 3 inches in other parts of the region.

Flooding is possible as a result of the weekend storm in areas with poor drainage, but forecasters said the weather system is still too far away to make more exact predictions.

A Friday morning storm delivered much-needed rain to the Bay Area, but it also caused a few problems. Thom Jensen reports.

The major weather system this weekend will also bring major waves along the coast, with swells as high as 20 to 30 feet coming starting Sunday and peaking Monday into Tuesday, according to the weather service.

As a result, agency officials said a high surf advisory or warning could be issued as soon as Friday, and people are advised to keep an eye out for rip tides and sneaker waves as well as hazardous conditions for small vessels on the water.

Visit NBC Bay Area's weather page for updated forecast information.

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