Here is my new weekly weather quiz question. What is  the “Photosphere?” Please remember to post your answer as a comment by clicking on “no comments /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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An upper level high pressure ridge (Shaded “Arch” shape with blue arrows) has taken over clearing the skies. By Saturday a frontal system will move into the Pacific Northwest Sunday. And here’s another frontal system approaching the coast Tuesday morning. Surprise! Here comes one more frontal system next Thursday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 25 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 39 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories: None At This Time.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly sunny and a bit warmer  this afternoon, increasing clouds to mostly cloudy tonight,
• Mostly cloudy with a slight (20%) chance of rain and cooler Saturday, cloudy with a slight (20%) chance of showers at night (under 0.10 in. of rain possible),
• Cloudy with rain Sunday, then showers Sunday night.
• highs 64-57 lows 46-44.
• Mostly cloudy and a bit cooler with showers and a slight (20%) chance of thunderstorms Monday, showers likely (70%) at night and Tuesday, a slight (20%) chance of showers with patchy fog Tuesday night,
• A slight (20%) chance of showers Wednesday and Wednesday night,
• Then mostly cloudy with a (30%) chance of showers Thursday.
• highs 53-56 lows 42-40 warming back to 42 Wednesday night. (seasonal averages high 57 low 37).

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Home Wood Heating Advisory:

Eugene-Springfield: GREEN – Burning is Allowed.

Oakridge: GREEN – Burning is Allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA).

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Forecast for Roseburg:

• Sunny this AM,  partly cloudy this afternoon, mostly cloudy with a slight (20%) chance of rain tonight,
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Saturday, cloudy with a slight (20%) chance of showers Saturday night,
• Then mostly cloudy with rain Sunday, showers in the evening, then rain late Sunday night.
• highs 67-60 lows 46-44.
• Mostly cloudy with showers and a bit cooler Monday, showers likely (70%) at night and Tuesday, mostly cloudy with a (30%) chance of showers Tuesday night and Wednesday, just mostly cloudy Wednesday night,
• Then mostly cloudy and a bit warmer with a slight (20%) chance of showers Thursday..
• highs 57-62 lows near 40. (seasonal averages high 58 low 39).

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Sunny this AM, increasing clouds to mostly cloudy and a bit cooler this afternoon, a (40%) chance of rain tonight (0.10 in. of rain possible),
• Mostly cloudy with a (50%) chance of rain and a bit cooler Saturday (0.10 in. of rain possible), cloudy with a slight (20%) chance of showers Saturday night (0.10 in. of rain possible),
• Then mostly cloudy and a bit warmer with rain Sunday, showers with a slight (20%) chance of thunderstorms Sunday night.
• highs 60-57 lows near 48.
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms and a bit cooler Monday and Monday night,
• Showers Tuesday, a (40%) chance of showers Tuesday night,
• Mostly cloudy with a slight (20%) chance of showers Wednesday, just mostly cloudy at night,
• Then mostly cloudy with a (30%) chance of showers Thursday.
• highs 55-57 lows near 44. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Mostly sunny today, increasing clouds to partly cloudy tonight,
• A mix of clouds and sun Saturday, cloudy with a (40%) chance of showers at night,
• Mostly cloudy with rain and a bit cooler Sunday, then rain and snow showers Sunday night.
• free air freezing level 9,000 ft. today through Saturday, snow level 9,000 ft. Saturday night, 7,000 ft. Sunday, then 5,000 ft. Sunday night.
• highs 56-47 lows 33-35.
• Mostly cloudy with rain and snow showers and a bit cooler Monday through Tuesday, cloudy with a good (50%) chance of rain and snow showers Tuesday night,
• Mostly cloudy and a bit warmer with a good (50%) chance of rain and snow showers Wednesday, a slight (20%) chance of rain and snow showers at night,
• Then mostly cloudy with a (30%) chance of rain and snow showers and a bit warmer Thursday.
• snow level 4,000 ft. Monday, 3,500 ft. Monday night through Wednesday, 4,500 ft. Wednesday night, then 4,000 ft. Thursday.
• highs 39-34 warming to 40 Thursday lows 24-27.

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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.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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