Here is my new weekly weather quiz question. What is  a “Back Door Cold Front?”  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 graphics for days 1-3 show a frontal system approaching Oregon Wednesday. An Upper Level High Pressure Ridge  (Shaded “Arch” shape with blue arrows) has moved in to dry us out, but Upper Level Low Pressure Trough (Shaded “U” shape with blue arrows) takes over late in the week enhancing rain chances. The graphics for days 3-7 show the frontal system that will move through the Pacific Northwest Thursday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• A Health Advisory has been issued for Detroit Lake, located 46 miles SE of Salem in Marion County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Detroit Lake. These toxin concentrations can be harmful to humans and animals. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.
• 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:

• Mostly sunny and a bit warmer today, mostly clear tonight,
• Partly cloudy in the AM, mostly sunny and a bit warmer Tuesday afternoon, mostly clear at night,
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with a slight (20%) chance of evening showers, then rain likely (70%) late Wednesday night.
• highs 74-79 cooling to 76 Wednesday lows 45-54.
• Cloudy with AM rain likely (70%), a good (50%) chance of showers and a bit cooler Thursday afternoon and at night.
• Cloudy with a good (50%) chance of showers and a bit cooler Friday through Saturday, mostly cloudy with a good (50%) chance of showers Saturday night,
• Mostly cloudy with a (40%) chance of showers and a bit warmer Sunday.
• highs 66-60 warming back to 66 Sunday lows near 46. (seasonal averages high 70 low 46)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (16)

Trees………. Moderate (15)

Last Counted: 6/2/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• A mix of clouds and sun and a bit warmer this afternoon, partly cloudy this evening, mostly clear late tonight,
• Sunny with patchy fog Tuesday AM, partly cloudy and a bit warmer in the afternoon, mostly clear in the evening, partly cloudy with patchy fog late Tuesday night,
• Partly cloudy with patchy fog Wednesday AM, mostly cloudy with a slight (20%) chance of showers in the afternoon, cloudy with a slight (20%) chance of evening rain, then  rain late Wednesday night.
• highs 77-82 cooling back to 77 Wednesday lows 49-59.
• Cloudy with AM rain, showers likely (70%) and cooler Thursday afternoon, a good (50%) chance of showers late at night,
• Mostly cloudy and a bit cooler with a good (50%) chance of showers Friday and Friday night,
• Showers likely (60%) and a bit cooler Saturday  afternoon and evening, a good (50%) chance of showers at night,
• Then mostly cloudy and a bit warmer with a (40%) chance of showers Sunday.
• highs 66-60 warming back to 66 Sunday lows 49-46. (seasonal averages high 74 low 50)

 

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

• Partly cloudy and a bit cooler this afternoon and evening, mostly cloudy with patchy coastal fog late tonight,
• Patchy AM fog, partly cloudy and a bit cooler Tuesday afternoon, partly cloudy with patchy fog late at night,
• Partly cloudy with patchy AM fog, mostly cloudy Wednesday afternoon with a slight (20%) of inland showers, mostly cloudy with rain Wednesday night.
• highs 62-60 warming back to 62 Wednesday lows 49-55.
• Mostly cloudy with rain Thursday AM, showers likely (60%) and cooler Thursday afternoon and evening, a good (50%) chance of showers late Thursday night,
• Then mostly cloudy with a (40%) chance of showers and a bit cooler Friday, a good (50%) chance of showers Friday night,
• Showers likely (70%) and a bit cooler Saturday and Saturday night,
• The mostly cloudy and a bit warmer with a (40%) chance of showers Sunday.
• highs 60-58 warming to 60 Sunday lows 48-50. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Mostly sunny and a bit warmer today, mostly clear tonight,
• Partly cloudy and warmer Tuesday and at night,
• Mostly sunny in the AM, partly cloudy with a slight (20%) chance of  showers and thunderstorms Wednesday afternoon, a good (50%) chance of evening showers with a slight (20%) chance of thunderstorms, then rain likely (70%) late Wednesday night.
• free air freezing level 10,000 ft. rising to 12,000 ft. today, 12,000 ft. tonight, 13,000 ft. Tuesday and Tuesday night, then snow level above 8,000 ft. Wednesday and Wednesday night.
• highs 70-75 cooling to 73 Wednesday lows 40-45.
• Mostly cloudy with AM rain likely (70%), cloudy a bit cooler with showers likely (70%) Thursday afternoon and evening, a (40%) chance of showers late at night and Friday AM, a bit cooler with a good (50%) chance of rain and snow showers in the afternoon and Friday night,
• Cloudy with a good (50%) chance of rain and snow showers Saturday AM, a bit cooler with rain and snow showers likely (70%) in the afternoon and evening, a good (50%) chance of rain and snow showers Saturday night,
• Mostly cloudy with a good (50%) chance of rain and snow showers Sunday AM, then a good (50%) chance of showers and a bit warmer Sunday afternoon.
• snow level above 8,000 ft. Thursday, above 8,000 ft. falling to 6,500 ft. late Thursday night, 6,500 ft. falling to 5,500 ft. Friday afternoon, 5,000 ft. Friday night through Saturday night, then 6,000 ft. Sunday afternoon.
• highs 57-48 warming to 55 Sunday lows 38-35.

 

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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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