Tonight through Wednesday:
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A weak system will bring a few showers to the mountains of SE Washington and NE Oregon until this evening.
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On Tuesday, the ridge strengthens, and another weak system will bring a few showers to the far eastern mountains.
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Tomorrow:
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Cold Canadian air moves in late Tuesday into Wednesday. Look for temperatures 8-10 degrees below normal .
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A weather system approaches the Pacific Northwest on Wednesday through Thursday, bringing precipitation.
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Rain will likely turn to snow in the north, with a mix of rain and snow in lower areas especially Wednesday night into Thursday morning.
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The Oregon Cascades could see significant snow, with a Winter Storm Watch issued for the Cascade crest.
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Long Term (Thursday through Monday):
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The upper-level ridge over British Columbia and the Yukon will persist through Saturday, with disturbances moving through the Pacific Northwest.
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Thursday will bring widespread rain and mountain snow, especially to the Oregon side of the Cascades and the Blues.
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There’s a chance of significant precipitation in these areas, with the possibility of winter storm conditions in the Cascades.