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, called an “Omega Block” because it is shaped like the Greek letter Omega,(Shaded “Arch” shape with blue arrows) has taken over clearing us out and keeping the sunshine around for the rest of the workweek, today. A weak cold front sneaks by the ridge and crosses the Oregon coast Saturday, but falls apart just giving us some clouds. Another frontal system behind it brings the chance of rain Sunday night. Here is the position of two frontal systems a week from today.

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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:

• Sunny and mild today, mostly clear tonight,
• Partly cloudy and a bit cooler Saturday through Sunday with a slight (20%) chance of showers late Sunday afternoon, then becoming mostly cloudy with rain Sunday night.
• highs 72-64 lows 42-40 warming to 46 Sunday night.
• Cloudy with a good (50%) chance  of showers and a bit cooler Monday, mostly cloudy with a (30%) chance of showers Monday night,
• Mostly cloudy with a slight (20%) chance of showers Tuesday, mostly cloudy at night,
• Then just partly cloudy and a bit warmer Wednesday through Thursday.
• highs 57-72 lows 40-44. (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 today, mostly clear tonight,
• Partly cloudy and a bit cooler Saturday, mostly clear in the evening, partly cloudy at night,
• Partly cloudy Sunday with a slight (20%) chance of showers in the afternoon, evening rain likely (60%), then rain late Sunday night.
• highs 74-68 lows near 46.
• Cloudy and a bit cooler Monday with a good (50%) chance of showers, mostly cloudy with a (40%) chance of showers Monday night,
• Mostly cloudy with a slight (20%) chance of showers Tuesday, just mostly cloudy at night,
• Partly cloudy and a bit warmer Wednesday, mostly cloudy at night,
• Then partly cloudy Thursday.
• highs 60-75 lows 42-46. (seasonal averages high 60 low 40).

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

• Patchy AM coastal fog, sunny this afternoon, clear this evening, partly cloudy late tonight and Saturday AM, sunny in the afternoon, partly cloudy Saturday night and Sunday AM, mostly cloudy a (30%) chance of coastal showers and a (30%) chance of rain in the afternoon while a slight (20%) chance of inland afternoon showers, then mostly cloudy with rain developing Sunday night.
• highs 56-60 lows 46-48.
• Mostly cloudy and a bit cooler with a good (50%) chance of showers Monday, a slight (20%) chance of showers at night and Tuesday, mostly cloudy at night,
• Partly cloudy and a bit warmer Wednesday, then mostly cloudy Wednesday night and Thursday.
• highs 57-69 lows 45-49. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Mostly sunny and a bit warmer today, mostly clear tonight,
• A mix of clouds and sun Saturday with a slight (20%) chance of afternoon showers and a bit cooler, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late at night and Sunday with a slight (20%) chance of showers Sunday afternoon, then  becoming mostly cloudy with rain Sunday night.
• free air freezing level 11,000 ft. today, 10,000 ft. tonight and Saturday, snow level 9,000 ft. Saturday night, 8,000 ft. Sunday, then 7,000 ft. Sunday night.
• highs 58-55 cooling to 57 Sunday lows 33-35 cooling back to 33 Sunday night.
• Mostly cloudy and a bit cooler with rain and snow showers likely (60%) Monday, a (30%) chance of rain and snow showers Monday night,
• A slight (20%) chance of rain and snow showers and a bit warmer Tuesday, just mostly cloudy at night,
• Then partly cloudy and a bit warmer Wednesday through Thursday.
• snow level 5,000 ft. Monday, 4,500 ft. Monday night and Tuesday, free air freezing level 9,000 ft. Tuesday night, 12,000 ft. Wednesday then 13,000 ft. Wednesday night and Thursday.
• highs 43-58 lows 28-34.

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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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