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It’s time for my new weekly weather quiz question. Here it is. What is a blocking ridge?  Please post your answer as a comment by clicking on “no comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized  weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good luck.

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The jet stream shows a high pressure ridge (shaded “arch” shape offshore) is aiming the airflow straight South toward the Pacific Northwest. The ridge will start to build in and that will keep us under a relatively calm weather pattern through the rest of the week. Remember that, particularly this time of the year, often when it’s not raining it is usually fogging. The next major frontal system should move in between Friday night and Saturday.

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Advisories:  A FROST ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 8 AM THURSDAY FOR THE SOUTH CENTRAL OREGON COAST, INCLUDING COOS BAY AND NORTH BEND.

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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: Mostly clear with areas of fog and freezing fog late tonight and Thursday AM, a mix of clouds and sun Thursday afternoon, then partly cloudy with patchy fog Thursday night and Friday AM, a mix of clouds and sun Friday, and mostly cloudy Friday night lows 26-36 highs 48-54. Mostly cloudy with rain likely (60%) Saturday and Saturday night, mostly cloudy with a good (50%) chance of rain Sunday through Monday night, rain likely (60%) Tuesday, then showers likely (60%) Tuesday night and Wednesday highs 56-48 lows 42-37. (seasonal  averages high 50 low 35)

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Forecast for the Umpqua Basin including, Roseburg: Mostly clear with areas of fog and freezing fog late tonight and Thursday AM, sunny Thursday, mostly clear with patchy fog late at night and early Friday AM, mostly cloudy Friday afternoon and Friday night, a  slight (20%) chance of rain Saturday, then rain likely (60%) Saturday night lows 30-39 highs 54-58. Mostly cloudy with a (40%) chance of rain Sunday, a good (50%) chance of rain Sunday night and Monday, rain likely (60%) Monday night and Tuesday, rain and snow Tuesday night and Wednesday highs 50-56 cooling to near 40 Wednesday lows 42-34. (seasonal averages high 54 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly clear

tonight with patchy fog late, sunny Thursday, mostly clear Thursday evening, partly cloudy Thursday night, mostly cloudy Friday and Friday night, mostly cloudy with a good (50%) chance of rain and breezy Saturday, then rain likely (60%) and breezy Saturday night lows 33-45 highs 50-56 cooling to 45 by Wednesday. Mostly cloudy with rain likely (60%) Sunday and Sunday night, then rain Monday through Tuesday night, and rain and snow Wednesday highs 49-56 lows 45-38. (seasonal averages high 54 low 41).

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Forecast for the Cascades of Lane County: Mostly clear tonight, mostly sunny Thursday, partly cloudy Thursday night, a mix of clouds and sun Friday, mostly cloudy Friday night, mostly cloudy with rain likely (60%) Saturday, and rain and snow likely (60%) Saturday night free air freezing level 5,000 ft. tonight, rising to 7,000 ft. Thursday afternoon, 8,000 ft. Thursday night and Friday,  7,500 ft. falling to 7,000 ft. Friday night, snow level 5,000 ft. Saturday, and 3,500 ft. Saturday night lows 23-32 highs 46-40. Mostly cloudy with a good (50%) chance of snow Sunday, a good (50%) chance of rain and snow Sunday night through Monday night, mostly cloudy with rain and snow likely (60%) Tuesday, then snow showers likely (60%) Tuesday night and Wednesday snow level 4,000 ft. Sunday and Sunday night, 4,500 ft. Monday, 4,000 ft. Monday night and Tuesday, falling to 2,500 ft. Tuesday night, and at the surface Wednesday highs 40-35 lows 27-22.

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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.