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.

________________

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.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 41 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 37 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

________________

Advisories: None At This Time.

________________

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).

________________

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy this evening, mostly cloudy late tonight and Sunday AM, partly cloudy in the afternoon through Monday AM, mostly sunny and a bit warmer Monday afternoon (Memorial Day), then mostly clear at night,
• Mostly sunny and warmer Tuesday, then mostly clear at night.
• lows 50-44 warming back to 50 Tuesday night highs 72-89.
• Mostly sunny Wednesday AM, partly cloudy in the afternoon and Wednesday night,
• Mostly sunny in the AM, partly cloudy with a slight (20%) chance of showers thunderstorms and cooler Thursday afternoon and evening, then just partly cloudy Friday through Saturday.
• highs 88-84 warming back to 84 Saturday lows 55-52 warming back to 55 Friday night. (seasonal averages high 69 low 45.)

_____

Eugene-Springfield Pollen Count:

Grass………. High (140)

Trees……….  Low (7)

Last Counted: 5/27/16

Data Courtesy of Oregon Allergy Associates.

___________________

Forecast for Roseburg:

• Mostly clear this evening, partly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of showers Sunday AM, partly cloudy in the afternoon through Monday AM, sunny and a bit warmer in the afternoon (Memorial Day), mostly clear at night,
• Mostly sunny and a bit warmer Tuesday, then mostly clear at night.
• lows 50-57 highs 75-93.
• Partly cloudy and a bit warmer Wednesday and Wednesday night,
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Thursday and at night,
• Then partly cloudy and a bit cooler Friday through Saturday.
• highs 96-83 lows 56-53. (seasonal averages high 72 low 49).

________________

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

• Mostly clear this evening, mostly cloudy with a slight (20%) chance of drizzle late tonight and Sunday AM, partly cloudy Sunday afternoon through Monday AM, sunny and a bit warmer in the afternoon (Memorial Day), mostly clear at night,
• Mostly sunny and a bit warmer Tuesday, then mostly clear Tuesday night.
• lows 52-54 highs 62-72.
• Partly cloudy and cooler Wednesday and at night,
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Thursday afternoon and at night,
• Then sunny Friday and Saturday, clear Friday night.
• highs 68-65 warming to 67 Saturday lows 54-52. (seasonal averages high 60 low 49)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy tonight through Sunday night,
• Mostly sunny and a bit warmer Monday (Memorial Day) and Tuesday, mostly clear at night.
• free air freezing level 9,000 ft. tonight, 10,000 ft. Sunday, 12,000 ft. Sunday night, 11,000 ft. Monday, 12,000 ft. Monday night, then 13,000 ft. Tuesday and Tuesday night.
• lows 36-32 warming to 44 Tuesday night highs 60-75.
• Mostly sunny Wednesday AM, partly cloudy and a bit warmer in the afternoon, partly cloudy Wednesday night,
• Mostly sunny in the AM, partly cloudy with a slight (20%) chance of showers and thunderstorms and a bit cooler Thursday afternoon and evening, just partly cloudy late Thursday night,
• Partly cloudy with a slight (20%) chance of showers Friday afternoon and evening, then just partly cloudy Friday night and Saturday.
• free air freezing level 13,000 ft. Wednesday and Wednesday night, snow level above 8,000 ft. Thursday through Friday night, then 13,000 ft.Saturday.
• highs 74-80 cooling to 70 Saturday lows 49-44.

________________

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________