Here is my new weekly weather quiz question. What is an “Air Mass Thunderstorm?” Please remember to post your answer at the bottom of this page. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An approaching Upper Level High Pressure Ridge (Shaded “Arch” shape with blue arrows) is pushing a low southward along the coast taking the clouds and rain with it as shown on the days 1-3 graphic. The graphic for days 3-7 shows more frontal systems heading our way that will try to break through blocking surface high pressure Sunday and Tuesday of next week. For mountain snow conditions at the local ski areas check out their websites or give them a call.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 27 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 45 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:

• A 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:

• Partly cloudy and a bit cooler this afternoon and evening, mostly cloudy with patchy fog late tonight and Wednesday AM, mostly cloudy Wednesday afternoon, cloudy with a (30%) chance of showers late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM showers, a mix of clouds and sun Thursday afternoon, partly cloudy in the evening, then mostly cloudy with patchy freezing fog late Thursday night.
• highs near 48 lows 32-30.
• Partly cloudy with patchy freezing fog Friday AM, partly cloudy and a bit cooler in the afternoon, partly cloudy with patchy freezing fog late Friday night and Saturday AM, a mix of clouds and sun and a bit cooler  Saturday afternoon, increasing clouds to mostly cloudy at night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Sunday,  a (30%) chance  of showers Sunday night,
• Then partly cloudy and a bit warmer Monday.
• highs 46-44 warming to 48 Sunday cooling to 46 Monday lows 28-32. (seasonal averages high 48 low 35)

 

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Forecast for Roseburg:

• Sunny and a bit cooler this afternoon, mostly clear this evening, partly cloudy with areas of freezing fog late tonight,
• Mostly cloudy with areas of AM freezing fog, a bit cooler with a slight (20%) chance of rain and snow showers Wednesday afternoon, cloudy with a (30%) chance of rain and snow showers Wednesday night (under 0.10 in. of rain possible, snow level 2,500 ft. falling to 2,000 ft. late at night),
• Mostly cloudy with a slight (20%) chance of AM, just mostly cloudy and a bit warmer Thursday afternoon, partly cloudy with patchy freezing fog late Thursday night.
• highs 48-50 lows 30-33 cooling back to 30 Thursday night.
• Partly cloudy with patchy freezing fog and a bit warmer Friday through Saturday night,
• Partly cloudy Sunday AM, mostly cloudy and a bit cooler in the afternoon, mostly cloudy with a slight (20%) chance of showers at night,
• Then just partly cloudy and warmer Monday.
• highs 52-50 lows 32-35. (seasonal averages high 51 low 37)

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

• Sunny and a bit cooler this afternoon, mostly clear this evening, partly cloudy with areas of inland freezing fog late tonight and Wednesday AM,  mostly cloudy with a slight (20%) chance of showers and a bit cooler in the afternoon (under 0.10 in. of rain possible), a (30%) chance of showers Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Thursday, then partly cloudy with patchy freezing fog late Thursday night.
• highs 50-52 lows 36-42 cooling back to 36 Thursday night.
• Partly cloudy and a bit warmer with patchy freezing fog Friday through Saturday night,
• Partly cloudy with a slight (20%) chance of  AM rain, mostly cloudy and a bit cooler with a slight (20%) chance of rain Sunday afternoon, a slight (20%) chance of showers Sunday night,
• Then just partly cloudy and a bit warmer Monday.
• highs 55-53 warming back to 55 Monday lows 38-42 cooling to 40 Sunday night. (seasonal averages high 52 low 40)

 

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Forecast for the Cascades in Lane County:

• Mostly sunny to partly cloudy and a bit cooler this afternoon, just partly cloudy tonight,
• A mix of clouds and sun a bit warmer with a slight (20%) chance of showers Wednesday afternoon, cloudy with a (40%) chance of snow showers late Wednesday night,
• Mostly cloudy with a (30%) chance of rain and snow showers Thursday, just partly cloudy at night.
• free air freezing level at the surface rising to 3,500 ft. this afternoon, 3,500 ft. falling to the surface tonight, snow level 2,500 ft. Thursday, then free air freezing level 4,500 ft. Thursday night.
• highs near 32 lows 17-22 cooling to 19 Thursday night.
• Partly cloudy Friday AM, mostly sunny and a bit warmer in the afternoon, partly cloudy Friday night and Saturday, more clouds to mostly cloudy late Saturday night,
• Mostly cloudy Sunday, a (40%) chance of showers at night,
• Then partly cloudy Monday.
• free air freezing level 4,500 ft. Friday, 6,500 ft. Friday night, 7,500 ft. Saturday, then 8,000 ft. Saturday night, 7,500 ft. Sunday, snow level 5,000 ft. Sunday night, then free air freezing level 8,000 ft. Monday.
• highs 33-40 cooling to 37 Monday lows 22-25.

 

 

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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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