The upper airflow (look at the little arrows along the coast) is curving from the southwest bringing warmer more moist air into Oregon. It’s called the “Pineapple Express” because the airflow is actually coming from Hawaii. One frontal system will push into our area (see last frame of animation) followed by others.

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For the Willamette Valley: There will be rain this evening then rain will be likely (60%) late night low 39-42. Wednesday will see rain high near 50 again with rain likely (60%) at night low 40-42. There will be a (50%) chance of rain Thursday high near 50. Thursday night through Monday there will be a (40-50%) chance of rain lows mid to upper 30s  highs mid to upper 40s.

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For the Umpqua Basin:  Rain tonight through Wednesday  low 40-42 high in the low 50s . Rain likely (60%) Wednesday night  low 41-44. Mostly cloudy chance (40%) rain Thursday high in the low 50s. Friday through Sunday a (50%) chance of rain highs in the mid 40s to near 50 lows in the upper 30s to low 40s. Rain will be likely Monday, Monday, night and Tuesday lows near  40 highs in the mid 40s.

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Forecast for the South Coast: Rain and windy (along the coast) tonight low 44-46. Rain likely (60%) Wednesday and showers (50% chance of inland showers) at night  high 55 low 45. A (50-60%) chance of rain Thursday through Sunday high 50-53 low 42-45. Rain likely (60%) Sunday night through  Tuesday highs near 50 lows in the low 40s.

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For the Cascades of Lane County:  Tonight rain snow level 6,000′ 1-3″ of snow.  Wednesday rain snow level 5,500‘ 6-10″ of snow possible. Showers likely Wednesday night snow level 5,000′ 1-4″ of snow.  A chance of rain Thursday snow level 6,000′ . Rain Thursday night snow level 7,000′. Chance of rain Friday through Sunday  snow level above the passes. Sunday night through Tuesday chance of rain and snow, snow level falling to below pass levels and staying there.

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Here is my weekly weather quiz question. What do “lake breezes” have to do with spiders? I’m not kidding. There is an answer. Please place your answer as a comment on this page. The first person to answer correctly will win a free week of personalized forecasts tailored to your needs. Good luck.