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) is taking over clearing the skies. By Saturday a a cold front will move in and a second cold front is over the Pacific Ocean not too far behind it. And here’s another frontal system approaching the coast Tuesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 26 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 5 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 18 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:

• Clear tonight,
• Mostly sunny Friday AM, partly cloudy and a bit warmer in the afternoon, mostly cloudy with a slight (20%) chance of rain late Friday night and Saturday (cooler), a good (50%) chance of showers at night,
• Cloudy with rain Sunday, then showers Sunday night.
• lows 37-46 cooling to 54 Sunday night highs 64-57.
• 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 and a bit warmer Tuesday night through 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:

• Clear tonight,
• Sunny Friday AM,  partly cloudy in the afternoon, mostly cloudy Friday night,
• 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 and Sunday night.
• lows 42-46 cooling to 44 Sunday night highs 67-60.
• 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:

• Clear tonight,
• Sunny in the AM, increasing clouds to mostly cloudy and a bit cooler Friday afternoon, a slight (20%) chance of coastal rain Friday night while a slight (20%) chance of inland rain late at night,
• Mostly cloudy with a slight (20%) chance of rain and a bit cooler Saturday, cloudy with a slight (20%) chance of showers Saturday night,
• Then mostly cloudy and a bit warmer with rain Sunday and Sunday night.
• lows near 48 highs 60-57.
• Mostly cloudy with showers and a bit cooler Monday through 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:

• Clear tonight,
• Mostly sunny Friday, partly cloudy in the evening, mostly cloudy and a bit cooler late Friday night and Saturday, mostly 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. tonight, 8,000 ft. Friday, 9,000 ft. Friday night and Saturday, then snow level 8,000 ft. Saturday night, 6,500 ft. Saturday night, 6,500 ft. Sunday, then 5,000 ft. Sunday night.
• lows 27-37 cooling to 30 Sunday night highs 57-45.
• 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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