Here is my weekly weather quiz question. What is  “Residual Moisture?” 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 Saturday. 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 28 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 25 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 through Saturday (cooler Saturday) night,
• Partly cloudy Sunday with a slight (20%) chance of showers in the afternoon, becoming mostly cloudy with rain at night (0.25 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.
• lows 42-46 cooling to 38 Monday night highs 66-57.
• Mostly cloudy and a bit warmer Tuesday, partly cloudy at night and Wednesday (a bit warmer), clear in the evening, partly cloudy late Wednesday night,
• Partly cloudy Thursday AM, sunny and a bit warmer in the afternoon, partly cloudy at night,
• Then mostly sunny and cooler Friday.
• highs 62-73 cooling to 67 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:

• Clear this evening, partly cloudy with patchy fog late tonight,
• Partly cloudy with patchy fog Saturday AM, partly cloudy in the afternoon, mostly clear at night,
• 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, partly cloudy with a slight (20%) chance of evening showers, then just mostly cloudy late Monday night.
• lows 47-40 highs 72-57.
• 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 Friday.
• highs 69-80 cooling to 70 Friday lows 43-50. (seasonal averages high 60 low 40).

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

• Clear this evening, mostly cloudy with patchy fog late tonight and Saturday AM, sunny in the afternoon, partly cloudy at night and Sunday AM, mostly cloudy with a (40%) chance of coastal showers 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 showers likely (70%), partly cloudy with a slight (20%) chance of evening showers, then just mostly cloudy late Monday night.
• lows 46-48 highs 59-55 warming back to 59 Monday.
• Mostly cloudy and warmer Tuesday, mostly clear in the evening, partly cloudy at night,
• Sunny and a bit warmer Wednesday and Thursday, partly cloudy Wednesday night and Thursday night,
• Then partly cloudy and cooler Friday.
• highs 57-70 cooling to 60 Friday lows 47-53 cooling to 49 Thursday night. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Mostly clear tonight,
• Partly cloudy Saturday with a slight (20%) chance of afternoon and evening showers and a bit cooler,  just partly cloudy late at night,
• Partly cloudy with a slight (20%) chance of showers Sunday afternoon, becoming mostly cloudy with rain 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.
• free air freezing level 10,000 ft. tonight, snow level above 8,000 ft. Saturday, 8,000 ft. Saturday night and Sunday, 7,000 ft. Sunday night, then 4,500 ft. Monday and Monday night.
• lows 33-35 cooling to near 28 Monday night highs 56-40.
• A mix of clouds and sun with a slight (20%) chance of rain and snow showers and a bit warmer Tuesday, just partly cloudy at night,
• Mostly sunny and a bit warmer Wednesday, clear at night,
• Sunny Thursday, partly cloudy Thursday night,
• Then mostly sunny Friday.
• snow level 4,500 ft. Tuesday, free air freezing level 9,000 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 47-62 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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