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) will keep us relatively dry for another day today. 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 tonight 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 35 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 53 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 53 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 patchy fog this AM, mostly cloudy and a bit cooler with good (50%) chance of rain this afternoon (under 0.10 in. of rain possible), rain tonight (0.25 in. of rain possible),
• Mostly cloudy with rain and a bit cooler Saturday (0.25 in. of rain possible) and at night (0.50 in. of rain possible),
• AM showers likely (70%), showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Sunday afternoon and evening, then showers likely (70%) late Sunday night.
• highs 62-54 lows 48-42.
• Mostly cloudy and a bit cooler with showers likely (70%) Monday, cloudy with a slight (20%) chance of showers at night,
• A good (50%) chance of rain Tuesday, rain Tuesday night,
• Then mostly cloudy and a bit cooler with rain likely (70%) Wednesday through Thursday.
• highs 52-56 lows 38-43. (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 today, rain developing tonight,
• Mostly cloudy with rain likely (70%) and a slight (20%) chance of thunderstorms Saturday AM, rain and a bit cooler in the afternoon and Saturday night,
• Mostly cloudy with showers likely (70%) Sunday AM, showers likely (70%) and a bit cooler with a slight (20%) chance of thunderstorms in the afternoon, a good (50%) chance of showers with a slight (20%) chance of  thunderstorms in the evening, then a good (50%) chance of showers late at night.
• highs 67-55 lows 48-39.
• Cloudy with a (40%) chance of AM showers, showers likely (70%) and a bit cooler Monday afternoon, mostly cloudy with a (40%) of showers Monday night,
• AM rain and snow likely (60%), rain likely (70%) and a bit warmer Tuesday afternoon, then rain likely (70%) Tuesday night through Thursday.
• highs 53-60 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:

• Mostly cloudy and a bit warmer with a slight (20%) chance of coastal rain today and breezy (Wind: S15-25 mph gusts to 45 mph), evening coastal rain and rain with a slight (20%) chance of coastal thunderstorms late tonight while inland rain at night and windy (Wind: S 20-30 mph at the shore while S 15-25 mph inland),
• Mostly cloudy with rain and a slight (20%) chance of thunderstorms Saturday AM, rain and a bit cooler in the afternoon, rain with a slight (20%) chance of thunderstorms Saturday night and windy (Wind: S 20-30 mph gusts to 45 mph decreasing and shifting SW 10-20 late at night),
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms and a bit cooler Sunday, showers likely (70%) with a slight (20%) chance of thunderstorms in the evening, then showers likely (70%) and colder Sunday night.
• highs 65-54 lows 53-43.
• Mostly cloudy and a bit cooler with showers likely (60%) Monday, a (40%) chance of showers at night,
• Rain likely (70%) and a bit warmer Tuesday, rain Tuesday night,
• Mostly cloudy with rain likely (70%) and breezy and a bit warmer Wednesday and Wednesday night,
• Then mostly cloudy and a bit cooler with rain likely (60%) Thursday.
• highs 52-59 cooling to 58 Thursday lows 39-44. (seasonal averages high 54 low 41).

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Forecast for the Cascades in Lane County:

• A mix of clouds and sun with a slight (20%) chance of rain and a bit warmer this afternoon and breezy (Wind: S 10-15 mph gusts to 30 mph increasing to S 15-25 mph gusts to 45 mph this afternoon), rain tonight and windy (Wind: S 20-30 mph gusts to 45 mph decreasing S 5-15 mph late at night),
• Mostly cloudy with rain and a bit cooler Saturday and in the evening, rain and snow late at night,
• Mostly cloudy and colder with rain and snow showers likely (70%) Sunday and Sunday night.
• snow level 6,000 ft. today, 6,500 ft. tonight and Saturday, then 6,500 ft. falling to 5,000 ft. Saturday night, 3,500 ft. Sunday, then 4,000 ft. Sunday night.
• highs 50-39 lows 34-26.
• Mostly cloudy and a bit warmer with rain and snow showers likely (70%) Monday, cloudy with a (30%) chance of rain and snow showers at night,
• Cloudy and a bit warmer with a good (50%) chance of rain and snow Tuesday, rain and snow Tuesday night,
• Then rain and snow likely (70%) Wednesday throughThursday.
• 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 36-46 lows 25-30.

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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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