Here is my weekly weather quiz question for the last time. What is a “Sling Psychrometer?” Here is the correct answer. A Sling Psychrometer is an instrument used to measure the water vapor content of the atmosphere in which wet and dry bulb thermometers are mounted on a frame connected to a handle at one end by means of a bearing or a length of chain. The psychrometer is whirled by hand to provide the necessary ventilation to evaporate water from the wet bulb. 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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An upper level high (Shaded “Arch” shape with blue arrows) will keep us in sunshine and warmer temperatures for the long Memorial Day holiday weekend. A frontal system will be moving toward the Pacific Northwest Wednesday returning the chance of showers by Thursday. Another frontal system is shown well offshore next Friday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 38 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 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:

• Partly cloudy and a bit warmer today and this evening, mostly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit warmer Sunday afternoon, partly cloudy Sunday night,
• AM clouds, mostly sunny and a bit warmer Monday afternoon (Memorial Day), then mostly clear at night.
• highs 70-76 lows 50-45.
• Mostly sunny and a bit warmer Tuesday, mostly clear at night,
• Mostly sunny Wednesday AM, partly cloudy in the afternoon, partly cloudy Wednesday night,
• Partly cloudy with a slight (20%) chance of showers and cooler Thursday afternoon through Friday AM, then just partly cloudy Friday afternoon.
• highs 86-79 lows 49-54. (seasonal averages high 69 low 45.)

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Eugene-Springfield Pollen Count:

Grass………. High (140)

Trees……….  Low (7)

Last Counted: 5/27/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Partly cloudy this AM, mostly sunny and a bit warmer this afternoon, mostly clear this evening, partly cloudy late tonight through Sunday night,
• Mostly sunny and a bit warmer Monday (Memorial Day), then mostly clear at night.
• highs 76-83 lows near 50.
• Mostly sunny and a bit warmer Tuesday, mostly clear at night,
• Partly cloudy and a bit warmer Wednesday and Wednesday night,
• Then partly cloudy with a slight (20%) chance of showers and a bit cooler Thursday through Friday.
• highs 84-92 cooling to 85 Thursday and Friday lows 56-54. (seasonal averages high 72 low 49).

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

• Sunny and a bit warmer today, mostly clear this evening, partly cloudy late tonight,
• AM clouds, partly cloudy Sunday afternoon and at night,
• Mostly sunny and a bit warmer Monday (Memorial Day), then mostly clear at night.
• highs 63-66 lows near 52.
• Mostly sunny and a bit warmer Tuesday, mostly clear Tuesday night,
• Partly cloudy and cooler Wednesday and at night,
• Partly cloudy with a slight (20%) chance of showers Thursday afternoon through Friday.
• highs 72-64 lows 53-50 warming to 54 Thursday night. (seasonal averages high 60 low 49)

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Forecast for the Cascades in Lane County:

• Partly cloudy today and tonight,
• Mostly cloudy with a slight (20%) chance of AM rain or drizzle, partly cloudy and a bit warmer Monday afternoon (Memorial Day) and at night.
• free air freezing level 8,000 ft. rising to 9,000 ft. today, 10,000 ft. falling to 8,000 ft. tonight, snow level 7,500 ft. Sunday AM, free air freezing level 10,000 ft. rising to 11,000 ft. late Sunday night and Monday, then 13,000 ft. falling to 12,000 ft. late Monday night.
• highs 58-66 lows 36-33 warming to 35 Monday night.
• Mostly sunny and a bit warmer Monday, mostly clear Monday night,
• Mostly sunny and a bit warmer Tuesday, mostly clear at night,
• Mostly sunny Wednesday AM, partly cloudy and a bit warmer in the afternoon, then partly cloudy Wednesday night,
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Thursday afternoon, mostly cloudy with a slight (20%) chance of evening showers, then partly cloudy with a slight (20%) chance of showers late Thursday night and Friday.
• free air freezing level 12,000 ft. rising to 13,000 ft. late Tuesday afternoon, 13,000 ft. Tuesday night through Wednesday night, then snow level above 8,000 ft. Thursday through Friday.
• highs 74-80 cooling to 70 Friday lows 45-50.

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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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