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Here is your last chance to answer my weekly weather quiz question. I’ll give you a definition and you tell me what I am defining. It is a warmer than normal period after the first frost in the Fall. What have I defined? Please place your answer as comment after the forecasts. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs, Good luck.

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A  high pressure ridge (shaded “Arch” shape in the jet stream over the Northwest) brought sunshine to the Pacific Northwest and  kept us warmer than normal. That will be changing, slowly. A trough of low pressure (the shaded “U” shape to the West) will be moving in behind the ridge. A frontal system will push through by early Sunday (position shown is for Monday) as the upper level low pressure trough migrates Eastward across Oregon. The chance of rain will also increase.

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Advisories:  NONE AT THIS TIME.

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Here are your detailed forecasts. **

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:  It was cooler than expected Wednesday and Thursday due to the low clouds and fog hanging around too long. Mostly sunny this afternoon, and mostly cloudy with patchy fog late tonight high 77 low near 50. AM fog or low clouds, then a mostly sunny Saturday, becoming mostly cloudy with a slight (20%) chance of rain late Saturday night, mostly cloudy with a (40%) chance of rain Sunday afternoon, then a good (50%) chance Sunday evening, rain likely (70%) Sunday night and Monday AM, a good (50%) chance of showers Monday afternoon and evening,  mostly cloudy Tuesday, partly cloudy Tuesday night, then a mix of clouds and sun Wednesday and Thursday, and partly cloudy at night highs 74-60 Monday then rising again to the low 70s Tuesday and Wednesday, cooling to 66 Thursday lows near 50 . (seasonal averages highs 71 low 43)

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Forecast for the Umpqua Basin including, Roseburg:  Sunny this afternoon, becoming partly cloudy tonight and Saturday AM (patchy AM fog), sunny in the afternoon, mostly clear in the evening, then mostly cloudy at night highs 80-77 lows near 50. Mostly cloudy with a slight (20%) chance of rain Sunday AM, a slight (20%) chance of afternoon showers, a (40%) chance of showers Sunday evening, then a (%) chance of rain late at night, cloudy with a (%) chance of showers Monday, a slight (20%) chance of showers Monday evening, then partly cloudy Tuesday through Wednesday night,  and sunny Thursday highs from 73 Sunday falling to 65 Monday, warming to the low 70s Wednesday and Thursday lows near 50. (seasonal averages high 76 low 47)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy at the shore today,  mostly cloudy with patchy fog inland, cloudy at the shore tonight,  mostly cloudy in the evening inland then partly cloudy late at night and Saturday AM, sunny Saturday afternoon, becoming mostly cloudy with a slight (20%) chance of rain late Saturday night highs 63 lows 53-50. Mostly cloudy Sunday with a (20%) chance of rain in the morning and a (%) chance of showers in the afternoon and evening , rain likely (60%) Sunday night,  mostly cloudy with a (%) chance of showers Monday, a slight (20%) chance of showers in the evening,  then partly cloudy Tuesday through Thursday  highs 63-67 lows near 50. (seasonal averages high 66 lows 48).

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Forecast for the Cascades of Lane County: Sunny today, clear tonight,  mostly sunny Saturday, partly cloudy Saturday night  free air freezing level 15,000 ft. today through Saturday, falling to 14,000 ft. Saturday night highs 74-72 lows 46-43. A mix of clouds and sun Sunday AM, mostly cloudy and cooler with a  (30%) chance of rain Sunday afternoon and night, mostly cloudy rain likely (60%) Monday AM, then a (30%) chance of showers in the afternoon and evening, a slight (20%) chance of showers late Monday night and Tuesday, mostly clear Tuesday night, a mix of clouds and sun Wednesday and Thursday, and partly cloudy each night snow level above 8,000 ft. Sunday and Sunday night, 5,500 ft. Monday and Monday night,  and above 8,000 ft. Tuesday, free air freezing level 12,000 ft. Tuesday night through Wednesday night, falling to 10,000 ft. Thursday highs 55 Sunday, 45 Monday, back to near 60 Tuesday and Wednesday,  cooling to 54 Thursday lows near freezing Sunday night warming to near 44 Monday through Thursday.

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.