Here is my weekly weather quiz question. What is the “ Automated Surface Observing System (ASOS)?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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The Upper level High Pressure Ridge (Shaded “Arch” shape with blue arrows) that kept quite warm is moving out to be replaced by an upper level low pressure trough (Shaded “U” shape with blue arrows on previous graphic). The graphics for days 1-3 shows the cold front that will drop our temperatures today. The graphics for days 3-7 show the next frontal system that will push into our area next week.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 1 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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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.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

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

• Mostly cloudy and much cooler with showers today (0.10 in. of rain possible), a good (50%) chance of evening showers, partly cloudy and colder with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• A mix of clouds and sun with a slight (20%) chance of showers and a bit warmer Saturday, then partly cloudy Saturday night through Sunday night.
• highs 60-58 warming to 62 Sunday lows 36-34 warming back to 36 Sunday night.
• Partly cloudy and a bit warmer Monday through Tuesday, mostly cloudy with a slight (20%) chance of showers Tuesday night,
• A (40%) chance of showers and a bit cooler Wednesday, then mostly cloudy with a good (50%) chance of showers Wednesday night and Thursday (a bit cooler).
• highs 68-70 cooling to 60 Thursday lows 40-44. (seasonal averages high 65 low 42)

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Eugene-Springfield Pollen Count:

Grass………. Low (0)

Trees………. High (191)

Last Counted: 5/3/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Cloudy with AM showers, much cooler with a good (50%) chance of showers this afternoon (0.25 in. of rain possible), mostly cloudy with a slight (20%) chance of evening showers, a good (50%) chance of rain and snow showers late tonight (under 0.10 in. of rain possible, snow level 3,000 ft.),
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit warmer with a slight (20%) chance of showers Saturday afternoon, then just partly cloudy Saturday night through Sunday night (a bit warmer Sunday).
• highs 56-64 lows 40-38 warming to back 40 Sunday night.
• Mostly sunny and a bit warmer Monday and Tuesday, mostly clear Monday night,mostly cloudy Tuesday night,
• Mostly cloudy with a slight (20%) chance of showers and a bit cooler Wednesday, then a (40%) chance of showers Wednesday night and Thursday (a bit cooler).
• highs 72-62 lows 43-48. (seasonal averages high 68 low 45)

 

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

• Cloudy with AM showers, a bit cooler with a (40%) chance of showers this afternoon (0.10 in. of rain possible), mostly cloudy and colder with a slight (20%) chance of showers Friday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM coastal showers and partly cloudy in the afternoon while mostly cloudy with a slight (20%) chance of inland showers Saturday (under 0.10 in. of rain possible), then partly cloudy at night through Sunday night (a bit warmer Sunday).
•  highs 55-58 lows near 42.
• Partly cloudy and a bit warmer Monday, mostly clear at night,
•  Partly cloudy Tuesday and Tuesday night,
• Mostly cloudy with a slight (20%) chance of showers and a bit cooler Wednesday, then a (30%) chance of showers Wednesday night and Thursday (a bit cooler).
• highs 60-58 lows 45-50 cooling to 47 Wednesday night. (seasonal averages high 58 low 45)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with AM showers, rain and snow showers and much cooler this afternoon (1 in. of snow possible), evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers and colder tonight (1 in. of snow possible),
• A (40%) chance of AM rain and snow showers, a bit cooler with a slight (20%) chance of rain and snow showers Saturday afternoon, mostly cloudy with a (30%) chance of evening rain and snow showers, a slight (20%) chance of rain and snow showers late at night,
• Partly cloudy and a bit warmer Sunday and Sunday night.
• snow level 7,000 ft. falling to 5,000 ft. this afternoon, 4,000 ft. tonight, 3,000 ft. Saturday, 4,000 ft. Saturday night free air freezing level 5,000 ft. Sunday, then 8,000 ft. Sunday night.
• highs 42-39 warming to 49 Sunday lows 24-22 warming to 27 Sunday night.
• Partly cloudy and a bit warmer Monday through Tuesday, mostly cloudy with a (40%) chance of showers Tuesday night,
• Mostly cloudy and a bit cooler with a (40%) chance of showers Wednesday, then showers likely (70%) Wednesday night and Thursday (a bit cooler).
• free air freezing level 8,000 ft. Monday, 9,000 ft. Monday night and Tuesday, snow level 8,000 ft. Tuesday night, then 7,000 ft. Wednesday, 6,500 ft. Wednesday night, then 6,000 ft. Thursday.
• highs 55-59 cooling to 45 Thursday lows near 33.

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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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