Here is my new weekly weather quiz question. What is  a “ Penumbra?”  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 air high pressure ridge (Shaded “Arch” shape with blue arrows) will keep us relatively dry for today into Friday. Low pressure (Shaded “U” shape with blue arrows) takes over bringing back the rain for the weekend. The parade of storms resumes as a frontal system moves in Friday night into Saturday (position shown is Sunday). We wil be visited by another frontal system Tuesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 64 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 in the Good category measuring Particulate Matter.

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

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Advisories:

• A HIGH WIND WATCH IS IN EFFECT FROM SATURDAY AFTERNOON THROUGH SATURDAY EVENING FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THR SISKIYOUS MOUNTAINS, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.

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

• A mix of clouds and sun with a slight (20%) chance of showers and thunderstorms and a bit warmer this afternoon, partly cloudy with patchy fog late tonight,
• Patchy AM fog, cloudy with a slight (20%) chance of rain Friday, rain at night,
• Mostly cloudy with AM showers likely (70%), rain and a bit cooler Saturday afternoon and Saturday night.
• highs 62-60 lows 45-47 cooling to 45 Saturday night.
• Mostly cloudy with showers likely (70%) and a bit cooler Sunday through Monday, cloudy with a good (50%) chance of showers Monday night,
• Mostly cloudy and a bit cooler with rain likely (70%) Tuesday and Tuesday night,
• Then rain Wednesday.
• highs 54-52 lows near 40. (seasonal averages high 54 low 36).

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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:

• Partly cloudy and a bit cooler with a slight (20%) chance of showers and a bit cooler this afternoon, partly cloudy in the evening, just mostly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of rain and a bit warmer er Friday afternoon, rain Friday night,
• Mostly cloudy with rain likely (70%) Saturday AM,  rain and a bit cooler in the afternoon and Saturday night.
• highs 63-65 cooling to 59 Saturday lows 40-43.
• Mostly cloudy with showers likely (70%) and a bit cooler Sunday, cloudy with evening showers likely (70%), a good (50%) chance of showers late at night,
• AM rain and snow showers likely (60%) and a bit cooler Monday, showers likely (70%) in the afternoon and Monday night,
• Mostly cloudy with rain likely (60%) and a bit warmer Tuesday, then rain Tuesday night and Wednesday (a bit warmer).
• highs 55-50 warming to 59 Wednesday lows 40-43. (seasonal averages high 56 low 38).

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

• Partly cloudy with a slight (20%) chance of showers this afternoon, partly cloudy this evening, mostly cloudy late tonight,
• Cloudy with a (30%) chance of coastal rain Friday while a (30%) chance of inland afternoon rain, rain Friday night and windy (Wind: S 20-30 mph at the shore while S 15-20 mph inland, gusts to 45 mph late at night),
• Mostly cloudy with rain likely (70%) Saturday AM, rain in the afternoon and evening, then rain with a slight (20%) chance of thunderstorms late Saturday night,
• highs 62-65 cooling back to 62 Saturday lows 46-50 cooling to 47 Saturday night.
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms Sunday AM, showers and a bit cooler with a slight (20%) chance of thunderstorms Sunday afternoon, showers likely (70%) Sunday night through Tuesday, then rain and breezy Tuesday night and Wednesday (a bit warmer).
• highs 54-52 warming to 57 Wednesday lows 43-46. (seasonal averages high 54 low 41).

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Forecast for the Cascades in Lane County:

• Partly cloudy and a bit cooler with a slight (20%) chance of rain and snow showers this afternoon, just partly cloudy tonight,
• Mostly cloudy with a slight (20%) chance of rain and a bit warmer Friday afternoon, rain Friday night,
• AM rain and snow showers likely (70%), showers and a bit cooler Saturday, then rain at night.
• snow level 5,000 ft. today, free air freezing level 7,000 ft. tonight, snow level 6,000 ft. Friday, 6,500 ft. Friday night, 6,000 ft. Saturday, then 6,500 ft. Saturday night.
• highs 44-50 cooling to 46 Saturday lows 30-34 cooling back to 30 Saturday night.
• Mostly cloudy and a bit cooler with rain and snow showers likely (70%) Sunday through Monday, a good (50%) chance of rain and snow showers at night,
• Rain and snow likely (70%) and a bit warmer Tuesday, then mostly cloudy with rain and snow Tuesday night and Wednesday.
• snow level  3,500 ft. Sunday, 4,000 ft. Sunday night, 3,500 ft. Monday and Monday night, 3,000 ft. Tuesday, 4,500 ft. Tuesday night, then 4,000 ft. Wednesday.
• highs 38-35 warming to 42 Wednesday lows near 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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