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Pattern change to return rain to Pacific Northwest and California by the weekend

AccuWeather logo AccuWeather 3/2/2021 Renee Duff

Following a quiet first few days of March, a slow-moving storm is expected to douse the Pacific Northwest coast later this week, eventually reaching portions of California by the weekend.

Residents and visitors will have a great opportunity to get outside and enjoy the first days of meteorological spring through the middle of the week as dry weather and near- to slightly above-average temperatures will dominate, thanks to a broad area of high pressure overhead.

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A midweek Pacific storm will slide well south into Southern California and the Desert Southwest and spare the region of any wet weather.

As the high pressure system slowly shifts eastward over the interior West later in the week, however, this will open up the gates for stormier weather to return to coastal areas farther north.

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"A storm will arrive late this week and bring rain and mountain snow to the Pacific Northwest and Northern California to start the weekend," AccuWeather Lead Long-Range Meteorologist Paul Pastelok said.

Rain is expected to reach the immediate coasts of Washington and Oregon later Thursday, and rounds of rain, some of which can be heavy, are likely to persist in these same areas through Friday.

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For at least a day or two, the broad area of high pressure to the east will essentially act like a road block for the storm and its associated rainfall from making much progress inland. This will prolong the soaking rainfall and could lead to rainfall amounts of 1-3 inches from the far northwest corner of California to coastal Washington.

These persistent downpours will act to not only slow travel, but also raise the risk of localized flooding.

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The heaviest rain may set up just west of Seattle and Portland, Oregon, but people in these areas will still need to break out the rain gear once again toward the end of the week with periods of wet weather expected.

It may take until the weekend for moisture to reach farther south in California into places such as San Francisco and perhaps even Fresno and Los Angeles. This far out, there remains question as to how much rain and mountain snow will fall across the state, which will depend on the exact track and intensity of the storm system by that point.

AccuWeather meteorologists will continue to monitor the storm throughout the week and fine-tune the details of the forecast in the coming days.

"We're monitoring yet another storm that will track into the West Coast by Monday, which may have a better chance of spreading precipitation into central and Southern California, as well as the Great Basin and Southwest later next week," Pastelok said.

Keep checking back on AccuWeather.com and stay tuned to the AccuWeather Network on DirecTV, Frontier, Spectrum, Fubo, and Verizon Fios.

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