Here is my 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) is moving away from us allowing low pressure (Shaded “U” shape with blue arrows) to take over bringing back the rain for the weekend. The parade of storms resumes as a cold front pushes its way through Oregon. We wil be visited by another frontal system Tuesday and Wednesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 35 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 31 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 60 in the Moderate category measuring Particulate Matter.

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

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Advisories:

• A HIGH SURF ADVISORY IS IN EFFECT UNTIL 3 AM SATURDAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH WIND WARNING IS IN EFFECT FROM 9 PM TONIGHT UNTIL 4 AM SATURDAY NEAR THE BEACHES AND HEADLANDS FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH WIND WATCH IS IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE SATURDAY NIGHT FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH WIND WARNING IS IN EFFECT UNTIL 10 PM SATURDAY FOR THE CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A HIGH WIND WARNING IS IN EFFECT FROM NOON UNTIL 8 PM SATURDAY THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A HIGH WIND WARNING IS IN EFFECT FROM 7 AM SATURDAY UNTIL  1 AM SUNDAY  FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT UNTIL 10 PM THIS EVENING FOR THE CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A FLOOD WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH LATE SATURDAY NIGHT FOR THE CENTRAL OREGON COAST, THE CURRY COUNTY COAST, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY.
• A WIND ADVISORY IS IN EFFECT FROM 7 AM UNTIL 10 PM SATURDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY.

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

• Mostly cloudy with a good (50%) chance of rain this evening, rain tonight (0.25 in. of rain possible) and Saturday (0.50 in. of rain possible), evening rain, showers late Saturday night (0.50 in. of rain possible) and breezy (Wind: SE 10-15 mph increasing and shifting SW 15-25 mph late gusts to 35 mph),
• AM showers, showers with a slight (20%) chance of thunderstorms and a bit cooler Sunday afternoon (0.20 in. of rain possible),  evening showers likely (70%) with a slight (20%) chance of thunderstorms, showers likely (70%) late Sunday night (0.20 in. of rain possible),
• Mostly cloudy and a bit cooler with showers likely (70%) Monday, then mostly cloudy with a good (50%) chance of showers at night.
• lows 48-39 highs 59-52.
• Cloudy with a slight (20%) chance of rain Tuesday, rain and a bit warmer Tuesday night through Wednesday night,
• Mostly cloudy and a bit cooler with rain likely (70%) Thursday and Friday, a good (50%) chance of rain Thursday night.
• highs 52-57 cooling to 64 Friday lows near 43. (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:

• Mostly cloudy with a good (50%) chance of evening rain, rain late tonight (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM rain, rain and a bit cooler in the afternoon (0.20 in. of rain possible)and breezy (Wind: S 15-25 mph), evening rain, showers late Saturday night,
• AM showers likely (70%) Sunday, showers and a bit cooler with a slight (20%) chance of thunderstorms in the afternoon (0.15 in. of rain possible, snow level 3,000 ft.), showers likely (70%) with a slight (20%) chance of  thunderstorms in the evening, a good (50%) chance of showers late at night (0.10 in. of rain possible, snow level 3,000 ft. falling to 2,500 ft. late),
• Cloudy with showers likely (70%) and a bit cooler Monday, mostly cloudy with showers likely (70%) in the evening, then a slight (20%) chance of showers Monday night.
• lows 50-38 highs 60-52.
• Mostly cloudy with rain Tuesday through Thursday, then rain likely (70%) Thursday night and Friday
• highs 53-60 cooling to 57 Friday lows near43. (seasonal averages high 57 low 39).

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

• Mostly cloudy coastal rain tonight while inland rain likely (70%) this evening and inland rain late tonight (0.35 in. of rain possible), windy (Wind: S 30-40 mph at the shore decreasing to S 15-25 mph late while S 15-25 mph inland),
• Mostly cloudy with rain and a bit cooler Saturday (0.70 in. of rain possible) and windy (Wind: S 10-20 mph increasing to S 25-35 mph in the afternoon at the shore while S 10-20 mph inland), rain with a slight (20%) chance of thunderstorms in the evening, coastal showers with a slight (20%) chance of thunderstorms late Saturday night while inland showers late (0.60 in. of rain possible), windy (Wind: S 25-35 mph shifting SW 15-20 mph late while SW 10-20 mph inland),
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms and a bit cooler Sunday (0.40 in. of rain possible), showers likely (70%) with a slight (20%) chance of thunderstorms in the evening, a good (50%) chance of showers late Sunday night (0.25 in. of rain possible),
• Mostly cloudy and a bit cooler with showers likely (70%) Monday, then a (40%) chance of showers at night.
• lows 53-43 highs 62-52.
• Mostly cloudy with rain and a bit warmer Tuesday through Thursday, then rain likely (70%) Thursday night and Friday
• highs 53-58 cooling to 56 Friday lows 39-44. (seasonal averages high 54 low 41).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a good (50%) chance of evening rain, rain tonight (0.50 in. of rain possible and windy (Wind: S 20-30 mph gusts to 40 mph decreasing S 10-15 mph gusts to 25 mph late at night),
• Mostly cloudy with rain and a bit cooler Saturday and breezy (Wind: S 10-15 mph gusts to 25 mph increasing to S 15-25 mph gusts to 35 mph in the afternoon), evening rain, rain and snow showers late at night and breezy (Wind: SW 15-25 mph gusts to 40 mph decreasing to 30 mph late at night),
• Mostly cloudy and colder with rain and snow showers Sunday and Sunday night,
• Mostly cloudy and a bit warmer with rain and snow showers likely (70%) Monday, then a good (50%)  chance of rain and snow showers at night.
• snow level 6,000 ft. tonight, 6,500 ft. Saturday, 7,000 ft. falling to 5,000 ft. Saturday night, 4,000 ft. Sunday, 3,500 ft. Sunday night, 3,000 ft. Monday, then 3,500 ft. Monday night.
• lows 36-23 highs 50-34.
• Cloudy and a bit warmer with a slight (20%) chance of rain and snow Tuesday, rain and snow Tuesday night and Wednesday, rain Wednesday night,
• Mostly cloudy with rain and snow Thursday, a good (50%) chance of rain and snow at night,
• Then rain and snow likely (70%) Friday.
• snow level 3,500 ft. Monday, 3,000 ft. Monday night, 2,500 ft. Tuesday, 5,000 ft. Tuesday night, 5,500 ft. Wednesday and at night, then 5,000 ft. Thursday.
• highs 38-44 cooling to 42 Friday lows near 30.

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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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