Here is my weekly weather quiz question. What is a “Roll Cloud?”  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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Another upper level high pressure ridge (Shaded “Arch” shape with blue arrows) is moving in clearing the skies and ending the chance showers and possible thunderstorms for a while. By the middle of the week a frontal system approaches the West Coast. By Friday it looks like a frontal system will be moving through the Pacific Northwest bringing more shower chances. The end of the weekend another frontal system will be approaching from the northwest probably making landfall sometime Monday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 6 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 13 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………. Moderate (11)

Trees………. Very High (529)

Last Counted: 4/21/16

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 with a slight (20%) chance of evening showers, patchy fog late tonight and Tuesday AM, a mix of clouds and sun and a bit warmer Tuesday afternoon, becoming cloudy with a (40%) chance of evening rain, rain late Tuesday night (0.10 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), a good (50%) chance of showers and a bit cooler Wednesday afternoon and evening (0.10 in. of rain possible), a  slight (20%) chance of showers late Wednesday night,
• A mix of clouds and sun and a bit warmer Thursday, then partly cloudy at night.
• lows 35-44 cooling to 42 Thursday night highs 60-64.
• A mix of clouds and sun and a bit warmer Friday, partly cloudy with a slight (20%) chance of showers Friday night,
• Partly cloudy Saturday and at night,
• Then mostly sunny and a bit warmer Sunday and Monday, mostly clear Sunday night.
• highs 66-78 lows 42-40 warming to 43 Sunday night. (seasonal averages high 63 low 41).

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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:

• Partly cloudy this evening, mostly cloudy with patchy fog tonight and Tuesday AM, mostly cloudy and a bit warmer Tuesday afternoon, becoming cloudy with a good (50%) chance of evening rain, rain late Tuesday night (under 0.15 in. of rain possible),
• Cloudy with AM showers likely (70%) Wednesday, a good (50%) chance of afternoon showers (under 0.10 in. of rain possible), mostly cloudy with a (30%) chance of showers Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit warmer Thursday with a slight (20%) chance of AM showers, then just partly cloudy Thursday night.
• lows 37-46 highs 62-59 warming to 67 Thursday.
• Mostly cloudy Friday and Friday night,
• Partly cloudy and a bit warmer Saturday through Sunday, mostly clear Sunday night,
• Then mostly sunny and a bit warmer Monday.
• highs 69-82 lows near 44. (seasonal averages high 65 low 43).

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

• Mostly clear this evening, partly cloudy late tonight and Tuesday AM, mostly cloudy in the afternoon, cloudy with a good (50%) chance of evening rain, rain late Tuesday night (0.20 in. of rain possible),
• Mostly cloudy with AM showers likely (60%), a good (50%) chance of showers and a bit warmer Wednesday afternoon (0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers Wednesday night,
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit warmer Thursday afternoon and at night.
• lows near 48 highs 57-60.
• Just mostly cloudy and a bit warmer Friday and Friday night,
• Partly cloudy and a bit warmer Saturday through Sunday, mostly clear Sunday night,
• Then partly cloudy and a bit warmer Monday.
• highs 62-70 lows 47-52. (seasonal averages high 56 low 44)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a (30%) chance of rain and snow showers this evening, just partly cloudy tonight,
• Partly cloudy with a slight (20%) chance of snow Tuesday, becoming mostly cloudy with (40%) chance of rain and snow showers in the evening, rain and snow likely (70%) late Tuesday night,
• Cloudy and a bit cooler with rain and snow showers likely (60%) Wednesday, a good (50%) chance of rain and snow showers at night,
• Mostly cloudy and a bit warmer Thursday with a slight (20%) chance of AM rain and snow showers, then just partly cloudy Thursday night.
• snow level 3,000 ft. tonight, free air freezing level 4,000 ft. rising to 5,500 ft. Tuesday afternoon, snow level 4,000 ft. Tuesday night, 4,500 ft. Wednesday, 5,000 ft. Wednesday night and Thursday AM, free air freezing level 6,500 ft. Thursday afternoon, then 8,000 ft. Thursday night.
• lows 24-32 highs 47-45 warming to 50 Thursday.
•  A mix of clouds and sun Friday, mostly cloudy with a (40%) chance of rain and snow showers Friday night,
• Just partly cloudy and a bit warmer Saturday and Saturday night,
• Then mostly sunny and a bit warmer Sunday and Monday (a bit cooler), mostly clear Sunday night.
• free air freezing level 9,000 ft. Friday, snow level 5,500 ft. Friday night, free air freezing level 7,000 ft. Saturday, 9,000 ft. Saturday night, 11,000 ft. Sunday, 12,000 ft. Sunday night, then 13,000 ft. Monday.
• highs 50-65 cooling to 63 Monday lows 30-37.

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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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