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 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 11 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 4 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 11 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 FRIDAY AFTERNOON THROUGH LATE FRIDAY NIGHT FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH WIND WATCH IS IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY EVENING FOR THE CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOUS MOUNTAINS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT FROM 4 AM UNTIL 10 PM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.

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

• Partly cloudy with patchy fog late tonight and Friday AM, cloudy and a bit cooler with possible sun peeks and a slight (20%) chance of rain Friday, rain Friday night,
• Mostly cloudy with rain and a bit cooler Saturday and at night,
• 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.
• lows 44-48 cooling back to 42 Sunday night highs 62-54.
• 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 clear this evening, increasing clouds to mostly cloudy late tonight,
• Mostly cloudy Friday, rain developing Friday night,
• 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.
• lows 44-48 cooling to 39 Sunday night highs 67-55.
• 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 clear this evening, increasing clouds to mostly cloudy late tonight,
• Mostly cloudy and a bit warmer with a slight (20%) chance of coastal rain Friday and breezy (Wind: S 20-30 mph at the shore while S 10-20 mph inland, late afternoon gusts to 40 mph), evening coastal rain and rain with a slight (20%) chance of coastal thunderstorms late Friday night 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.
• lows 46-53 cooling to 43 Sunday night highs 65-54.
• 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:

• Partly cloudy tonight,
• A mix of clouds and sun with a slight (20%) chance of rain and a bit warmer Friday afternoon, rain Friday 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.
• free air freezing level 7,000 ft. tonight, snow level 6,000 ft. Friday, 6,500 ft. Friday night and Saturday, then 6,500 ft.  falling to 5,000 ft. Saturday night, 3,500 ft. Sunday, then 4,000 ft. Sunday night.
• lows 32-34 cooling to 26 Sunday night highs 50-39.
• Mostly cloudy and a bit warmer with rain and snow showers likely (70%) Monday, cloudy with a good (50%) 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, then mostly cloudy with rain and snow likely (70%) and a bit warmer Tuesday night through Thursday.
• 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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