An upper level low (shaded area) is moving down from the the North and will bring cold Arctic air in behind it. A new cold front has moved in from Canada and has brought the cold air down from the North. This front will produce very little precipitation which could fall in the form of snow flurries. A colder blast of Arctic air will follow Sunday, maybe snow flurries, but again no accumulation expected, so far anyway. The colder weather will last into the beginning of next week.

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For the Willamette Valley: Partly cloudy this evening then mostly cloudy with fog & freezing fog again at night low 24-27. Partly cloudy Sunday with a slight (20%) chance of light snow showers after some patchy freezing fog high in the mid 30s. Partly cloudy  and colder  at night and colder low in the low teens. Monday will see a mix of clouds and sun high right around freezing at 30-33, then partly cloudy at night low in the low teens. A mix of clouds and sun again Tuesday high near 34-36. Partly cloudy at night low 24. Wednesday partly cloudy with a slight (20%) chance of rain (could see a snow flurry mixed in mainly late night and early morning) snow level at 1,000′ high 40 mostly cloudy overnight slight (20%) chance of rain low 30. Mostly cloudy with a (50%) chance of rain and snow  Thursday and Thursday night highs near 40 low in the mid 30s. Mostly cloudy with a (40%) chance of rain Friday through Saturday night highs 38-43 lows upper 20s to mid 30s.

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For the Umpqua Basin the weather conditions will be just about the same as the Willamette Valley through Sunday except about 3-5 degrees warmer so bundle up.

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For the South Oregon Coast:  A FREEZE WARNING  IS IN EFFECT FROM 11 PM TONIGHT THROUGH 9 AM SUNDAY. A FREEZE WATCH IS IN EFFECT FROM MIDNIGHT SUNDAY NIGHT THROUGH 9 AM MONDAY  AND A FREEZE WATCH IS IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY MORNING ANOTHER FREEZE WATCH TUESDAY EVENING THROUGH WEDNESDAY MORNING .

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For the Cascades:  The snow level will stay below the passes tonight through  Monday. Then the free air freezing level will be at the surface  Monday night and Tuesday because there should be no precipitation. It’s back to a snow level below pass levels Tuesday night through Saturday.