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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An Upper level High Pressure Ridge (Shaded “Arch” shape with blue arrows) took over and will keep quite warm through Thursday. The graphics for days 1-3 shows the cold front that will drop our temperatures Friday. The graphics for days 3-7 show another frontal system that will push into our area between next Tuesday night and Wednesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 35 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 6 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 19 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 clear tonight,
• Patchy AM fog, a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers and thunderstorms Thursday afternoon (under 0.10 in. of rain possible, more in storms, small hail possible), showers likely (70%) with a slight (20%) chance of thunderstorms in the evening, mostly cloudy with showers likely (70%) late Thursday night (0.10 in. of rain possible, more in storms, small hail possible),
• Mostly cloudy and cooler Friday (0.10 in. of rain possible), a (40%) chance of showers colder at night (under 0.10 in. of rain possible),
• A mix of clouds and sun with a (30%) chance of showers and a bit warmer Saturday, then partly cloudy with a slight (20%) chance of showers Saturday night.
• lows 53-36 highs 72-56 warming to 58 Saturday.
• A mix of clouds and sun and a bit warmer Sunday, partly cloudy Sunday night through Monday night,
• A mix of clouds and sun and a bit warmer Tuesday, partly cloudy with a (30%) chance of showers at night,
• Then mostly cloudy with a (30%) chance of showers and a bit cooler Wednesday.
• highs 63-67 cooling back to 63 Wednesday lows 39-46. (seasonal averages high 64 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:

• Mostly clear tonight,
• Partly cloudy with patchy AM fog and a slight (20%) chance of rain and drizzle, mostly cloudy and a bit cooler with a (40%) chance of thunderstorms Thursday afternoon and evening (under 0.10 in. of rain possible), a (30%) chance of showers late at night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM showers, much cooler with showers likely (60%) Friday afternoon (0.10 in. of rain possible), mostly cloudy with a (30%) chance of showers and colder Friday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with a (30%) chance of rain and snow showers Saturday, then just mostly cloudy Saturday night.
• lows 58-38 highs 78-58.
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Sunday, just partly cloudy and a bit warmer Sunday night and Monday, mostly clear Monday night,
• Partly cloudy and a bit warmer Tuesday, then mostly cloudy with a (30%) chance of showers Tuesday night and Wednesday (a bit cooler).
• highs 62-72 cooling to 67 Wednesday lows 45-42 warming to 49 Tuesday night. (seasonal averages high 67 low 45)

 

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

• Partly cloudy this evening at the shore and mostly cloudy with a slight (20%) chance of coastal rain and drizzle late tonight while partly cloudy inland this evening and mostly cloudy inland late, patchy fog late tonight and Thursday AM, a slight (20%) chance of AM coastal rain and drizzle with a slight (20%) chance of coastal afternoon showers while a bit cooler with a slight (20%) chance of inland thunderstorms Thursday afternoon (under 0.10 in. of rain possible), a slight (20%) chance of coastal showers late at night while a slight (20%) chance of inland showers Thursday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit cooler with showers likely (60%) Friday (0.10 in. of rain possible), colder with a (30%) chance of showers Friday night,
• Mostly cloudy with a slight (20%) chance of showers Saturday, then partly cloudy Saturday night.
• lows 54-42 highs 62-55.
• Partly cloudy and a bit warmer Sunday, mostly clear Sunday night,
• Partly cloudy Monday (a bit cooler) through Tuesday (a bit warmer), then mostly cloudy with a (30%) chance of showers Tuesday night and Wednesday.
• highs 58-60 lows 48-45 warming back to 48 Tuesday night. (seasonal averages high 58 low 45)

 

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Forecast for the Cascades in Lane County:

• Mostly clear with a slight (20%) chance of evening showers and thunderstorms, a slight (20%) chance of showers late tonight,
• A  mix of clouds and sun and a bit cooler with a good (50%) chance of showers and a slight (20%) chance of thunderstorms Thursday afternoon (0.10 in. of rain possible, more in storms), showers and a slight (20%) chance of thunderstorms in the evening, showers likely (70%) and colder with a slight (20%) chance of thunderstorms late at night (0.50 in. of rain possible, more in storms, evening small hail possible),
• Mostly cloudy with showers likely (70%) and much cooler Friday, evening rain and snow showers likely (60%), a good (50%) chance of rain and snow showers late Friday night,
• A mix of clouds and sun with a (30%) chance of rain and snow showers and a bit cooler Saturday, then partly cloudy with a (40%) chance of rain and snow showers at night.
• snow level above 8,000 ft. tonight through Thursday night, 8,000 ft. falling to 7,000 ft. Friday afternoon, 4,000 ft. Friday night, 3,000 ft. Saturday, then 4,000 ft. Saturday night.
• lows 44-27 highs 65-40.
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain and snow showers Sunday, just partly cloudy and a bit warmer Sunday night through Tuesday, mostly cloudy with a (40%) chance of showers Tuesday night,
• Then a mix of clouds and sun bit cooler with a (40%) chance of showers Wednesday.
• snow level 4,000 ft. Sunday, free air freezing level 8,000 ft. Sunday night, 9,000 ft. Monday, 10,000 ft. Monday night, 9,000 ft. Tuesday, snow level 8,000 ft. Tuesday night, then 7,000 ft. Wednesday.
• highs 47-55 cooling to 50 Wednesday lows 29-34.

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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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