Here is my weekly weather quiz question for the last time. What is  “Rime Ice?” Here is the correct answer. Rime Ice is an opaque coating of tiny, white, granular ice particles caused by the rapid freezing of supercooled water droplets on impact with an object. See also clear ice.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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Another upper level trough of low pressure (Shaded “U” shape with blue arrows) will move in increasing the marine airflow for more clouds and cooler temperatures and showers with possible thunderstorms today.  A frontal system is heading our way bringing more showers and possible thunderstorms with it. By the middle of next week a frontal system approaches the West Coast. By next weekend it looks like a frontal system will be heading our way from the Northwest.

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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 9 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 17 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:

• Mostly cloudy with showers tonight (0.25 in. of rain possible),
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms and a bit cooler Sunday afternoon (0.15 in. of rain possible), a good (50%) chance of showers and a slight (20%) chance of thunderstorms in the evening, a slight (20%) chance of showers and colder Sunday night (under 0.10 in. of rain possible),
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Monday AM, a (30%) chance of showers in the afternoon (under 0.10 in. of rain possible), just partly cloudy at night,
• A mix of clouds and sun and a bit warmer Tuesday, then becoming mostly cloudy with a slight (20%) chance of showers Tuesday night.
• lows 45-38 warming to 43 Tuesday night highs 54-60.
• Cloudy and a bit warmer with a (40%) chance of showers Wednesday, mostly cloudy with a slight (20%) chance of showers at night,
• A mix of clouds and sun and a bit warmer Thursday, partly cloudy Thursday night,
• A mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Friday, then mostly cloudy with a slight (20%) chance of showers and a bit cooler Friday night and Saturday.
• highs 62-65 cooling back to 62 Saturday lows 42-44 cooling back to 42 Friday night. (seasonal averages high 62 low 40).

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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 showers tonight (0.20 in. of rain possible) and Sunday AM, showers with a slight (20%) chance of thunderstorms and a bit cooler in the afternoon (0.25 in. of rain possible, snow level 3,000 ft.), a (40%) chance of evening showers with a slight (20%) chance of thunderstorms, a (30%) chance of rain and snow showers late Sunday night (under 0.10 in. of rain possible, snow level 3,000 ft.),
• Mostly cloudy with a (30%) chance of AM rain and snow showers (under 0.10 in. of rain possible), a (30%) chance of showers and a bit warmer Monday afternoon, just partly cloudy Monday night,
• Just mostly cloudy and a bit warmer Tuesday, then mostly cloudy with a (40%) chance of showers Tuesday night.
• lows 46-38 warming to 43 Tuesday night highs 54-64.
• Cloudy with a good (50%) chance of showers Wednesday, a slight (20%) chance of showers at night,
• Mostly cloudy and a bit warmer Thursday and Thursday night,
• Mostly cloudy with a slight (20%) chance of showers Friday and Saturday, just mostly cloudy Friday night.
• highs 64-68 lows 43-46 cooling back to 43 Friday night. (seasonal averages high 64 low 43).

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

• Cloudy with showers tonight (0.40 in. of rain possible) and Sunday AM, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Sunday afternoon (0.25 in. of rain possible), a (30%) chance of showers Sunday night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers and a bit warmer Monday (under 0.10 in. of rain possible), just partly cloudy Monday night.
• Mostly cloudy and a bit warmer Tuesday, then a (40%) chance of showers Tuesday night.
• lows 48-40 warming to 46 Tuesday night highs 53-59.
• Cloudy with a good (50%) chance of showers Wednesday, just mostly cloudy Wednesday night and Thursday, partly cloudy Thursday night,
• Mostly cloudy Friday and Friday night,
• Then mostly cloudy with a  slight (20%) chance of showers Saturday.
• highs near Friday lows 46-50 cooling back to 46 Friday night. (seasonal averages high 56 low 44).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers tonight (0.25 in. of rain possible, 1-3 in. of snow possible),
• Mostly cloudy with AM rain and snow showers, rain and snow showers and a bit cooler with a slight (20%) chance of thunderstorms Sunday afternoon (0.25 in. of rain possible, 1-4 in. of snow possible), rain and snow showers likely (70%) in the evening, a good (50%) chance of rain and snow showers and colder Sunday night (0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of rain and snow showers Monday AM, a (30%) chance of rain and snow showers and a bit warmer in the afternoon, partly cloudy with a (30%) chance of rain and snow showers in the evening, just at partly cloudy Monday night and Tuesday, then mostly cloudy with a slight (20%) chance of showers Tuesday night.
• snow level 5,000 ft. tonight, 4,000 ft. Sunday, 3,000 ft. Sunday night, 2,500 ft. Monday, 3,500 ft. Monday night, free air freezing level 5,000 ft. Tuesday, then snow level 5,000 ft. Tuesday night.
• lows 32-24 warming to 30 Tuesday night highs 37-46.
• Mostly cloudy and a bit cooler with a (40%) chance of rain and snow showers Wednesday, a (30%) chance of showers Wednesday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Thursday, partly cloudy at night,
• A mix of clouds and sun and a bit warmer with a (30%) chance of showers Friday, mostly cloudy with a slight (20%) chance of showers Friday night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of rain and snow showers Saturday.
• snow level 5,000 ft. Wednesday, 5,500 ft. Wednesday night, 6,000 ft. Thursday, free air freezing level 8,000 ft. Thursday night, snow level 7,000 ft. Friday, 6,000 ft. Friday night, then 5,500 ft. Saturday.
• highs 45-52 cooling to 48 Saturday lows near 32.

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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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