Here is my weekly weather quiz question for the last time. What is “Residual Moisture?”  Here is the correct answer. Residual Moisture is atmospheric moisture which lingers over an area after the main weather system has departed. I’ll have a new weekly weather quiz question for you starting Monday. 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 ridge of high pressure is weakening allowing a weak frontal system to bring more clouds to Oregon and the chance of showers Sunday afternoon through Monday night. Drying weather Tuesday through Friday then a frontal system approaches the coast Friday bringing the slight chance of showers back Saturday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 27 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 20 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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Eugene-Springfield Pollen Count:

Grass………. Low (2)

Trees………. High (373)

Last Counted: 3/30/16

Data Courtesy of Oregon Allergy Associates.

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

• Partly cloudy tonight,
• Partly cloudy Sunday with a slight (20%) chance of showers in the afternoon, becoming mostly cloudy with rain at night (under 0.10 in. of rain possible),
• AM showers likely (60%), a good (50%) chance  of showers and a bit cooler Monday afternoon, mostly cloudy with a slight (20%) chance of showers Monday night,
• Mostly cloudy and a bit warmer Tuesday, then partly cloudy at night.
• lows 42-47 cooling to 38 Monday night warming to 42 Tuesday night highs 68-56 warming to 66 Tuesday.
• Partly cloudy Wednesday AM, mostly sunny and a bit warmer in the afternoon, clear in the evening, partly cloudy Wednesday night,
• Sunny and a bit warmer Thursday, partly cloudy Thursday night and Friday (a bit cooler Friday), just mostly cloudy at night,
• Then a mix of clouds and sun with a slight (20%) chance of showers Saturday.
• highs 76-79 cooling to 66 Saturday lows near 45. (seasonal averages high 59 low 39).

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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 tonight,
• Partly cloudy Sunday AM, mostly cloudy and a bit cooler with a slight (20%) chance of thunderstorms in the afternoon, rain in the evening, showers late Sunday night (0.25 in. of rain possible),
• Mostly cloudy and a bit cooler Monday with a good (50%) chance of showers (snow level 3,500 ft.), a slight (20%) chance of evening showers, just mostly cloudy late Monday night,
• Mostly cloudy and warmer Tuesday, mostly clear in the evening, then partly cloudy late Tuesday night.
• lows 45-40 warming to 43 Monday night highs 72-56 warming to 70 Tuesday.
• Sunny and a bit warmer Wednesday and Thursday, clear Wednesday night, partly cloudy Thursday night,
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Friday, mostly cloudy with a slight (20%) chance of showers at night,
• Then mostly cloudy and a bit cooler with a (30%) chance of showers Saturday.
• highs 83-85 cooling to 66 Saturday lows 53-48. (seasonal averages high 60 low 41).

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

• Partly cloudy tonight and Sunday AM, increasing clouds to mostly cloudy with coastal afternoon showers while a good (50%) chance of inland afternoon showers (under 0.10 in. of rain possible), evening rain,  coastal showers likely (60%) late Sunday night while inland showers late at night (0.25 in. of rain possible),
• Mostly cloudy and a bit cooler Monday with coastal showers likely (70%) while a good (50%) chance of inland showers, partly cloudy in the evening with a slight (20%) chance of inland showers, just mostly cloudy late Monday night,
• Mostly cloudy and warmer Tuesday, then mostly clear in the evening and partly cloudy late Tuesday night.
• lows 46-42 warming to 46 Tuesday night highs 60-55 warming back to 60 Tuesday.
• Sunny and a bit warmer Wednesday, clear at night,
• Sunny Thursday, partly cloudy Thursday night and Friday, mostly cloudy with a slight (20%) chance of showers Friday night,
• Then mostly cloudy and cooler with a (40%) chance of showers Saturday.
• highs 73-60 lows 54-50 cooling to 48 Friday night. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of showers this evening, just partly cloudy late at night,
• Partly cloudy Sunday with a slight (20%) chance of afternoon showers, becoming mostly cloudy with evening showers, rain late Sunday night (0.25 in. of rain possible),
• Cloudy with AM rain and snow showers,  colder with a good (50%) chance of rain and snow showers Monday afternoon, mostly cloudy with a (40%) chance of evening rain and snow showers, a slight (20%) chance of rain and snow showers and colder Monday night,
• A mix of clouds and sun and a bit warmer Tuesday, then partly cloudy at night.
• snow level 7,500 ft. tonight, 8,000 ft. Sunday, 8,000 ft. falling to 7,000 ft. Sunday night, 4,000 ft. Monday and Monday night, free air freezing level 5,000 ft. rising to 6,500 ft Tuesday, then 10,000 ft. Tuesday night.
• lows 35-26 highs 58-40 warming to 50 Tuesday.
• Mostly sunny and a bit warmer Wednesday, clear at night,
• Sunny Thursday, mostly clear Thursday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Friday, mostly cloudy with a slight (20%) chance of showers at night,
• Then a mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Saturday.
• free air freezing level 11,000 ft. Wednesday, 12,000 ft. Wednesday night through Thursday night, then snow level above 8,000 ft. Friday through Saturday.
• highs 65-52 lows 40-35.

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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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