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 Thursday. An Upper Level High Pressure Ridge  (Shaded “Arch” shape with blue arrows) moved in to dry us out, but an 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 moved through the Pacific Northwest Thursday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 22 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 10 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:

• Sunny and a bit warmer this afternoon, mostly clear tonight.
• Partly cloudy and a bit cooler Wednesday, becoming mostly cloudy with rain late Wednesday night (0.25 in. of rain possible) and Thursday AM, showers likely (70%) and a bit cooler in the afternoon, a good (50%) chance of showers Thursday night.
• highs 79-65 lows 49-54 cooling to 48 Thursday night.
• Cloudy with a good (50%) chance of AM showers, showers likely (70%) and a bit cooler Friday through Saturday evening, mostly cloudy with a good (50%) chance of showers late Saturday night,
• Mostly cloudy with a (40%) chance of showers Sunday AM, a slight (20%) chance of showers and a bit warmer in the afternoon and at night,
• A slight (20%) chance of showers Monday AM, then a mix of clouds and sun and a bit warmer in the afternoon.
• highs 63-67 lows near 45. (seasonal averages high 71 low 46)

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Eugene-Springfield Pollen Count:

Grass………. Very High (757)

Trees………. Moderate (18)

Last Counted: 6/6/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly sunny and a bit warmer this afternoon, mostly clear with patchy fog late tonight and Wednesday AM, becoming mostly cloudy and a bit cooler with a slight (20%) chance of rain in the afternoon (under 0.10 in. of rain possible), cloudy with a (40%) chance of evening rain, rain late Wednesday night (0.25 in. of rain possible),
• Cloudy with AM rain, showers likely (70%) and cooler Thursday afternoon, then mostly cloudy with a good (50%) chance of showers late at night.
• highs 82-68 lows 52-58 cooling to 50 Thursday night.
• Mostly cloudy showers likely (70%) and a bit cooler Friday through Saturday, a (40%) chance of showers at night,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Sunday, a slight (20%) chance of showers in the evening, then just partly cloudy late Sunday night and Monday (a bit warmer).
• highs 64-62 warming to 72 Monday lows 49-45. (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, partly cloudy with patchy fog late tonight,
• Mostly cloudy with patchy AM coastal fog while partly cloudy inland Wednesday AM and mostly cloudy with a slight (20%) chance of inland showers and a bit warmer in the afternoon (under 0.10 in. of rain possible), coastal rain at night while inland evening rain likely (70%) with inland rain late Wednesday night (0.50 in. of rain possible),
• Cloudy with rain Thursday AM, a good (50%) chance of coastal showers while inland showers likely (70%) and a bit cooler Thursday afternoon, then mostly cloudy with a good (50%) chance of showers late Thursday night.
• highs 60-64 cooling to 62 Thursday lows 50-55 cooling back to 50 Thursday night.
• Mostly cloudy with showers likely (70%) and a bit cooler Friday, showers Friday night,
• Mostly cloudy with showers and a bit cooler Saturday, evening showers likely (70%), a slight (20%) chance of showers late Saturday night,
• A slight (20%) chance of showers Sunday AM, just mostly cloudy and a bit warmer in the afternoon, mostly cloudy Sunday night and Monday AM, then partly cloudy and a bit warmer Monday afternoon.
• highs 60-58 warming to 62 Monday lows 50-48. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Mostly sunny and a bit warmer this afternoon, partly cloudy tonight,
• Partly cloudy with a slight (20%) chance of  showers and thunderstorms and a bit cooler Wednesday afternoon, a good (50%) chance of evening showers with a slight (20%) chance of thunderstorms, rain likely (70%) late Wednesday night,
• Mostly cloudy with rain Thursday AM, cloudy and cooler with showers in the afternoon, showers likely (70%) late at night.
• free air freezing level 12,000 ft. today , 13,000 ft. tonight, snow level above 8,000 ft. Wednesday and Wednesday night, above 8,000 ft. falling to 7,500 ft. Thursday afternoon, then above 8,000 ft. falling to 6,500 ft. late Thursday night.
• highs 75-55 lows 45-47 cooling to 38 Thursday night.
• Cloudy with showers likely (70%) Friday AM, a bit cooler with rain and snow showers likely (70%) in the afternoon and Friday night,
• Mostly cloudy and a bit cooler with rain and snow showers likely (70%) Saturday and in the evening, a good (50%) chance of rain and snow showers late Saturday night,
• Mostly cloudy with a good (50%) chance of rain and snow showers Sunday AM, a good (50%) chance of showers and a bit warmer Sunday afternoon and evening, a slight (20%) chance of showers late Sunday night,
• A mix of clouds and sun with a slight (20%) chance of showers Monday AM, then mostly sunny and a bit warmer Monday afternoon.
• snow level 6,500 ft. falling to 5,500 ft. Friday afternoon, 5,000 ft. Friday night through Saturday night, 6,000 ft. Sunday afternoon, 6,500 ft. Sunday night, 7,000 ft. Monday AM, then free air freezing level 10,000 ft. Monday afternoon.
• highs 50-46 warming to 54 Monday 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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