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 16 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 5 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 clear tonight,
• Partly cloudy in the AM, mostly sunny and a bit warmer Tuesday afternoon, partly cloudy at night.
• Partly cloudy and a bit cooler Wednesday, a good (50%) chance of evening rain, mostly cloudy with rain late Wednesday night (0.25 in. of rain possible) and Thursday AM, mostly cloudy with showers and a bit cooler in the afternoon, a good (50%) chance of showers Thursday night.
• lows 46-54 cooling to 48 Thursday night highs 79-66.
• 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 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………. Moderate (16)

Trees………. Moderate (15)

Last Counted: 6/2/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• 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 with patchy fog late Tuesday night,
• Sunny with patchy fog Wednesday AM, becoming mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon (under 0.10 in. of rain possible), cloudy with a (40%) chance of evening showers, 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.
• lows 49-59 highs 77-82 cooling back to 77 Wednesday.
• Mostly cloudy with a good (50%) chance of AM showers, showers likely (70%) and a bit cooler Friday afternoon, showers likely (70%) and a bit cooler Friday night and Saturday, a (40%) chance of showers at night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Sunday and in the evening, then just partly cloudy Sunday night and Monday (a bit warmer).
• 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 this evening, mostly cloudy with patchy coastal fog and drizzle late tonight,
• Mostly cloudy with patchy AM fog and coastal drizzle, just partly cloudy and a bit cooler Tuesday afternoon, partly cloudy with patchy fog late at night,
• 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 showers and cooler Thursday afternoon, then mostly cloudy with a good (50%) chance of showers late Thursday night.
• lows 49-55 highs 62-60 cooling to 59 Thursday.
• Mostly cloudy with showers likely (70%) and a bit cooler Friday and Friday night,
• Mostly cloudy with a good (50%) chance of showers and a bit cooler Saturday and Saturday night,
• A slight (20%) chance of showers Sunday AM, just mostly cloudy and a bit warmer in the afternoon and Sunday night,
• Then partly cloudy and a bit warmer Monday.
• highs 58-60 lows near 50. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy tonight,
• Sunny in the AM, partly cloudy and warmer Tuesday afternoon and at night,
• 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 late Wednesday night and Thursday AM, cloudy and cooler with showers in the afternoon, showers likely (70%) late at night.
• free air freezing level 12,000 ft. tonight, 13,000 ft. Tuesday and Tuesday night, snow level above 8,000 ft. Wednesday through Thursday, then above 8,000 ft. falling to 6,500 ft. late Thursday night.
• lows 42-47 cooling to 38 Thursday night highs 74-55.
• 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, rain and snow showers likely (70%) 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,
• Partly cloudy with a slight (20%) chance of showers Monday AM, then just partly cloudy 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 57-46 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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