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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) is aiming the airflow straight South toward the Pacific Northwest.  A frontal system slipped in from the Northwest bringing the chance of rain and a second front is moving down behind it to dry us off and cool the temperatures a bit. Yet another 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 and Saturday.

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Advisories:  A FROST ADVISORY IS IN EFFECT  FROM 2 AM UNTIL 8  AM WEDNESDAY FOR THE SOUTH CENTRAL OREGON COAST.

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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: Partly cloudy tonight with patchy fog late and early Wednesday AM, a mix of clouds and sun Wednesday afternoon, and partly cloudy Wednesday night with areas of fog late at night and Thursday AM, a mix of clouds and sun Thursday afternoon, then partly cloudy with patchy fog Thursday night lows 28-35 highs 49-54. A mix of clouds and sun Friday, mostly cloudy with a slight (20%) chance of rain Friday night, mostly cloudy with rain likely (60%) Saturday and Saturday night, mostly cloudy with a (40%) chance of rain Sunday through Monday night, and rain likely (60%) Tuesday highs 58-52 lows 40-37. (seasonal  averages high 50low 34)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy this evening, partly cloudy with patchy fog late tonight and Wednesday AM, sunny in the afternoon,  mostly clear Wednesday night with areas of fog and freezing fog, mostly clear Wednesday night, areas of fog and freezing fog late Wednesday night and Thursday AM, sunny Thursday,  partly cloudy with patchy fog late at night and early Friday AM, mostly cloudy Friday, a  slight (20%) chance of rain Friday night lows 30-35 highs 50-57. Mostly cloudy with a good (50%) chance of rain Saturday, a good (50%) chance of rain Saturday night and Sunday, mostly cloudy with a (40%) chance of rain Sunday night, mostly cloudy with a good (50%) chance of rain Monday and Monday night, then rain likely (60%) Tuesday highs 57-50 rising to near 55 Monday and Tuesday lows 38-42. (seasonal averages high 54 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy this evening, mostly clear with areas of patchy fog tonight and Wednesday AM, sunny Wednesday afternoon, mostly clear with areas of fog late Wednesday night, sunny Thursday, partly cloudy Thursday night, mostly cloudy Friday, then mostly cloudy with a (30%) chance of rain Friday night  lows 34-45 highs 50-57. Mostly cloudy with a good (50%) chance of rain Saturday, rain likely (60%) Saturday night and Sunday, a good (50%) chance of rain Sunday night, then mostly cloudy rain likely (60%) Monday through Tuesday highs 49-55 cooling to 50 Tuesday lows near 45. (seasonal averages high 54 low 41).

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Forecast for the Cascades of Lane County: Partly cloudy tonight, mostly sunny Wednesday and Thursday, mostly clear Wednesday night, partly cloudy Thursday night,a mix of clouds and sun Friday, mostly cloudy with a slight (20%) chance of rain late Friday night free air freezing level 2,000 ft. tonight, 3,000 ft. Wednesday, 7,000 ft. Wednesday night, 7,500 ft. Thursday, 9,000 ft. Thursday night and Friday, and 6,500 ft. Friday night lows 20-32 highs 42-49. Mostly cloudy with snow and rain likely (60%) Saturday and Saturday night, a good (50%) chance of snow and rain Sunday through Monday night, and mostly cloudy with rain and snow likely (60%) Tuesday snow level 4,500 ft. Saturday, and 3,500 ft. Saturday night, 2,500 ft. Sunday, 3,500 ft. Sunday night, and 4,500 ft. Monday, 5,000 ft. Monday night, and 4,000 ft. Tuesday highs 42-40 lows 28-25.

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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.