Here is my weekly weather quiz question for the last time. What are “Sastrugi?” Here is the correct answer. Sastrugi are ridges of snow formed on a snow field by the action of the wind. 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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As the upper level low (Shaded “U” shape with blue arrows) to the south slides away to the east a high pressure ridge (Shaded “Arch” shape with blue arrows) over us will move away letting another low to take over returning the chance of showers. A frontal system (shown to the NW over the ocean) will be sliding through the Pacific Northwest  Sunday, but it looks quite dry and should only cool us off with a slight chance of precipitation for Mother’s Day. Next Saturday a frontal system will come in through the “back door” which means it moves from northeast to southwest across the Pacific Northwest.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 30 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 35 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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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 the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Sunny and warm today, clear this evening, increasing clouds to cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of AM drizzle or showers, a mix of clouds and sun and a bit cooler Sunday afternoon (Mother’s Day), partly cloudy in the evening, mostly cloudy and colder late at night,
• Partly cloudy and cooler Monday and Monday night.
• highs 76-65 lows 50-44 warming to 46 Monday night.
• Mostly sunny and a bit warmer Tuesday and Wednesday and Thursday,  mostly clear each night,
• Mostly sunny in the AM, then partly cloudy and a bit cooler Friday afternoon.
• highs 75-82 cooling back to 75 Friday lows near 46. (seasonal averages high 65 low 42.)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (12)

Trees………. Moderate (55)

Last Counted: 5/06/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Sunny and a bit warmer today, mostly clear this evening, mostly cloudy with a slight (20%) chance of rain and drizzle late tonight,
• Mostly cloudy with a slight (20%) chance of AM rain and drizzle and a bit cooler Sunday afternoon (Mother’s Day) partly cloudy in the evening, mostly cloudy late Sunday night,
• AM clouds, mostly sunny and a bit warmer Monday afternoon, mostly clear Monday night.
• highs 82-69 warming to 72 Monday lows 53-44.
• Then sunny and a bit warmer Tuesday, Wednesday, Thursday (a bit cooler) and Friday (a bit cooler), clear each night,
• highs 85-89 cooling back to 85 Friday lows near 50. (seasonal averages high 68 low 46).

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

• Mostly cloudy with a slight (20%) chance of AM coastal showers and partly cloudy this afternoon while mostly cloudy inland in the AM and sunny and a bit cooler this afternoon inland, partly cloudy this evening, mostly cloudy with a slight (20%) chance of rain or drizzle late tonight,
• Mostly cloudy with patchy fog and a slight (20%)  chance of AM rain and drizzle, just mostly cloudy and a bit cooler Sunday afternoon (Mother’s Day), partly cloudy in the evening, mostly cloudy late Sunday night,
• AM clouds, mostly sunny and a bit warmer Monday afternoon, then mostly clear at night.
• night highs 60-63 lows 54-48.
• Then sunny and a bit warmer Tuesday, Wednesday,Thursday (a bit cooler) and Friday (a bit cooler), clear each night.
• highs 75-65 lows near 53. (seasonal averages high 58 low 46)

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Forecast for the Cascades in Lane County:

• Mostly sunny and a bit warmer today, partly cloudy and colder tonight,
• AM clouds, a mix of clouds and sun and a bit cooler Sunday (Mother’s Day), partly cloudy at night,
• Then partly cloudy and a bit warmer Monday and Monday night.
• free air freezing level 12,000 ft. today, 13,000 ft. tonight,  12,000 ft. rising to 13,000 ft. Sunday, 12,000 ft. falling to 9,000 ft. Sunday night, 9,000 ft. rising to 10,000 ft. Monday afternoon, then 10,000 ft. Monday night.
• highs 65-52 warming to 60 Monday lows 38-34 warming to 39 Monday night.
• Mostly sunny and a bit warmer Tuesday,  (cooler) Wednesday, and (warmer) Thursday, clear at night,
• Then mostly sunny and a bit cooler Friday.
• free air freezing level 10,000 ft. rising to 11,000 ft. Tuesday,11,000 ft. Tuesday night and Wednesday, 12,000 ft. Wednesday night through Thursday night, then 11,000 ft. Friday.
• highs 67-64 warming back to 67 Thursday cooling back to 64 Friday lows 38-45.

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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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