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 tonight through Monday evening. Drying weather Tuesday through Friday as high pressure strengthens again, then two frontal systems , one to the northwest and the other to the southwest approache the coast Friday bringing the slight chance of showers back to the Pacific Northwest.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 40 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 11 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:

• Becoming cloudy with rain developing this evening, showers late tonight (0.25 in. of rain possible),
• Mostly cloudy with AM showers likely (60%), a good (50%) chance of showers and much cooler Monday afternoon (under 0.10 in. of rain possible), a slight (20%) chance of evening showers, just mostly cloudy Monday night and Tuesday AM, a mix of clouds and sun and a bit warmer Tuesday afternoon, then partly cloudy at night,
• Sunny and a bit warmer Wednesday, then clear at night.
• lows 47-36 warming to near 40 Wednesday night highs 55-77.
• Sunny and a bit warmer Thursday, partly cloudy Thursday night and Friday (cooler), partly cloudy with a slight (20%) chance of showers Friday night,
• Then a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Saturday and Sunday, partly cloudy with a slight (20%) chance of showers Saturday night.
• highs 79-63 lows 48-45. (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 cloudy with rain and a slight (20%) chance of thunderstorms this evening, showers late tonight (0.10 in. of rain possible),
• Mostly cloudy and a bit cooler Monday with a good (50%) chance of showers (under 0.10 in. of rain possible, snow level 3,500 ft.), just mostly cloudy Monday night,
• Mostly cloudy in the AM, partly cloudy and warmer Tuesday afternoon, mostly cloudy with a slight (20%) chance of evening thunderstorms, mostly clear late Tuesday night,
• Sunny and a bit warmer Wednesday, then clear at night.
• lows 46-40 warming to 50 Wednesday night highs 58-84.
• Sunny and a bit warmer Thursday, partly cloudy Thursday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Friday afternoon, mostly cloudy with a slight (20%) chance of evening thunderstorms, a slight (20%) chance of showers late at night,
• Partly cloudy and cooler with a (30%) chance of showers Saturday, then mostly cloudy with a slight (20%) chance of showers Saturday night and Sunday.
• highs 86-65 lows 52-45. (seasonal averages high 60 low 41).

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

• Mostly cloudy with rain this evening, coastal showers likely (60%) late tonight while inland showers late tonight (0.25 in. of rain possible),
• Mostly cloudy with AM coastal showers likely (70%), a good (50%) chance of showers and a bit cooler Monday afternoon while a good (50%) chance of inland showers (under 0.10 in. of rain possible), partly cloudy in the evening, just mostly cloudy late Monday night,
• Mostly cloudy Tuesday AM, partly cloudy and a bit warmer in the afternoon, mostly clear Tuesday night,
• Sunny and a bit warmer Wednesday, then clear at night.
• lows 46-42 warming to 54 Wednesday night highs 54-77.
• Sunny and a bit cooler Thursday, partly cloudy Thursday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Friday, mostly cloudy with a slight (20%) chance of evening thunderstorms, a (40%) chance of showers Friday night,
• Mostly cloudy and cooler with a (30%) chance of showers Saturday, then partly cloudy with a slight (20%) chance of showers Saturday night and Sunday.
• highs 68-57 lows 52-48. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Becoming mostly cloudy with showers likely (60%) and a slight (20%) chance of evening thunderstorms, showers late tonight (0.25 in. of rain possible),
• Cloudy with AM rain and snow showers likely (70%) Monday, a bit colder with a good (50%) chance of rain and snow showers Monday afternoon, a slight (20%) chance of rain and snow showers Monday night,
• Mostly cloudy Tuesday AM, partly cloudy and a bit warmer in the afternoon,  becoming mostly clear Tuesday night,
• Sunny and a bit warmer Wednesday, then clear at night.
• snow level 8,000 ft. falling to 6,500 ft. tonight, 4,000 ft. Monday and Monday night, free air freezing level 5,000 ft. rising to 6,500 ft Tuesday, 8,000 ft. rising to 10,000 ft. Tuesday night, 12,000 ft. Wednesday night, then 13,000 ft. Wednesday night.
• lows 33-27 warming to 45 Wednesday night highs 38-66.
• Sunny Thursday, partly cloudy 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,
• A mix of clouds and sun with a (40%) chance of showers and a bit cooler Saturday, partly cloudy with a slight (20%) chance of showers Saturday night,
• Then a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Sunday.
• free air freezing level 12,000 ft. Thursday and Thursday night, snow level above 8,000 ft. Friday through Saturday 8,000 ft. Saturday night, then 6,500 ft. Sunday.
• highs 65-47 lows 42-35.

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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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