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 cold front to bring some more clouds to Oregon today. Another frontal system (position shown is Monday) brings the chance of rain Sunday night and Monday. Here is the position of another frontal system moving onshore next Friday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 21 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 19 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 and cooler today and 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),
• Cloudy with AM showers likely (60%), a good (50%) chance  of showers and a bit cooler Monday afternoon, then mostly cloudy with a slight (20%) chance of showers Monday night.
• highs 68-57 lows 42-46 cooling to 38 Monday night.
• AM clouds, a mix of clouds and sun and a bit warmer Tuesday, partly cloudy at night through Wednesday night,
• Then mostly sunny and cooler Thursday and Friday, partly cloudy Thursday night.
• highs 62-75 cooling to 68 Friday lows 42-47. (seasonal averages high 59 low 38).

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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:

• Sunny then partly cloudy late this afternoon, mostly clear tonight,
• Sunny Sunday AM, mostly cloudy and a bit cooler with a slight (20%) chance of thunderstorms in the afternoon, rain Sunday night (0.25 in. of rain possible),
• Cloudy and a bit cooler Monday with a good (50%) chance of showers (Snow level 3,500 ft.), partly cloudy with a slight (20%) chance of evening showers, then just mostly cloudy late Monday night.
• highs 69-57 warming back to 69 Monday lows 45-40 warming to 43 Monday night.
• Mostly cloudy and warmer Tuesday, mostly clear in the evening,  partly cloudy late at night,
• Sunny and a bit warmer Wednesday and Thursday, partly cloudy both nights,
• Then partly cloudy Friday.
• highs 80-67 lows 50-45. (seasonal averages high 60 low 41).

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

• Partly cloudy this afternoon through Sunday AM, mostly cloudy with a (40%) chance of coastal rain in the afternoon while a slight (20%) chance of inland afternoon showers (under 0.10 in. of rain possible), evening coastal rain and rain likely (60%) late while inland rain Sunday 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 with a slight (20%) chance of evening showers, then just mostly cloudy late Monday night.
• highs 59-55 warming back to 59 Monday lows 44-48 cooling to 44 Monday night.
• Mostly cloudy and warmer Tuesday, mostly clear in the evening, partly cloudy late at night,
• Sunny and a bit warmer Wednesday and Thursday, partly cloudy Wednesday night and Thursday night,
• Then partly cloudy and cooler Friday.
• highs 70-59 lows 53-48. (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 late this afternoon and evening and a bit cooler,  just partly cloudy late at night,
• Partly cloudy in the AM, with a slight (20%) chance of showers Sunday afternoon, becoming mostly cloudy with evening showers, rain late Sunday night,
• Mostly cloudy and a bit cooler with rain and snow showers likely (70%) Monday, then a (40%) chance of rain and snow showers Monday night.
• snow level above 8,000 ft. today, 8,000 ft. tonight, 8,000 ft. Sunday, 8,000 ft. falling to 7,000 ft. Sunday night, then 4,000 ft. Monday and Monday night.
• highs 58-40 lows 35-28.
• Partly cloudy and a bit warmer Tuesday and at night,
• Mostly sunny and a bit warmer Wednesday, clear at night,
• Sunny Thursday, partly cloudy Thursday night,
• Then mostly sunny Friday.
• free air freezing level 6,500 ft. Tuesday, 10,000 ft. Tuesday night, 11,000 ft. Wednesday, 12,000 ft. Wednesday night and Thursday, 10,000 ft. Thursday night, then 9,000 ft. Friday.
• highs 47-64 cooling to 55 Friday lows 35-40 cooling back to near 35 Thursday night.

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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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