Here is my weekly weather quiz question for the last time. What are “Backing Winds?” Here is the correct answer. Backing Winds are winds which shift in a counterclockwise direction with time at a given location (e.g. from southerly to southeasterly), or change direction in a counterclockwise sense with height (e.g. westerly at the surface but becoming more southerly aloft). The opposite of veering winds. I’ll have a new weekly weather quiz question for you starting Monday. 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) that took over control of the Pacific Northwest weather bringing lots of sunshine and heat is slowly moving away to be replaced by a trough of low pressure (Shaded “U” shape with blue arrows). The graphics for days 1-3 shows a frontal system moving through Oregon cooling us down dramatically bringing in cooler and moist marine air. The graphics for days 3-7 show no major frontal systems over the Pacific Northwest through next Sunday.

 

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 29 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

• A RED FLAG WARNING IS IN EFFECT UNTIL 5 PM MONDAY FOR THE EASTERN ROGUE RIVER VALLEY AND THE WESTERN ROGUE BASIN.
• 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 with a slight (20%) chance of showers and thunderstorms late this evening, slowly increasing clouds tonight,
• Mostly cloudy Monday with a slight (20%) chance of AM showers and thunderstorms, partly cloudy and much cooler in the afternoon and evening, becoming cloudy late Monday night and Tuesday AM, mostly sunny in the afternoon, partly cloudy in the evening, mostly cloudy at night,
• Cloudy in the AM, partly cloudy Wednesday afternoon and evening, then becoming mostly cloudy late Wednesday night.
• lows 56-50 highs near 75.
• AM clouds and sun, mostly sunny and a bit warmer Thursday afternoon, mostly clear at night,
• Mostly sunny and a bit cooler Friday, partly cloudy at night,
• Then partly cloudy and a bit warmer Saturday, partly cloudy at night,
• Then partly cloudy and a bit cooler Sunday.
• highs 79-77 warming back to 79 Saturday cooling back to 77 Sunday lows near 53. (seasonal averages high 76 low 49)

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Eugene-Springfield Pollen Count

Grass………. Very High (434)

Trees………. Moderate (19)

Last Counted: 6/23/17

Data Courtesy of Oregon Allergy Associates.

 

 

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Forecast for Roseburg:

• Partly cloudy with a slight (20%) chance of thunderstorms tonight,
• Mostly cloudy and much cooler Monday with a slight (20%) chance of isolated thunderstorms, mostly clear in the evening, mostly cloudy late Monday night and Tuesday AM, sunny and a bit cooler in the afternoon, mostly clear in the evening, mostly cloudy late at night,
• Mostly cloudy Wednesday AM, sunny and a bit cooler in the afternoon, then mostly clear Wednesday night.
• lows 62-53 highs 82-79.
• Mostly sunny and a bit warmer Thursday, Friday and Saturday, mostly clear each night,
• Then partly cloudy and a bit cooler Sunday.
• highs 80-83 cooling back to 80 Sunday lows near 56. (seasonal averages high 79 low 54)

 

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

• Mostly cloudy with a slight (20%) chance of coastal thunderstorms late tonight while a slight (20%) chance of inland thunderstorms tonight,
• Mostly cloudy with patchy AM coastal fog and drizzle and just mostly cloudy and a bit cooler Monday afternoon while a slight (20%) chance of AM thunderstorms inland and just mostly cloudy in the afternoon, mostly cloudy at night with patchy coastal drizzle late Monday night,
• Cloudy with patchy AM coastal drizzle otherwise mostly cloudy Tuesday afternoon, clear in the evening, mostly cloudy late at night and Wednesday AM, sunny in the afternoon, then mostly clear Wednesday night.
• lows 55-52 highs near 63.
• Mostly sunny Thursday, mostly clear at night,
• Partly cloudy and a bit warmer Friday through Saturday, mostly clear in the evening, then partly cloudy late Saturday night and Sunday (a bit cooler).
• highs 63-65 lows 53-55. (seasonal averages high 63 low 52)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy this evening with a (30%) chance of showers and a slight (20%) chance of isolated thunderstorms, mostly cloudy with a slight (20%) chance of showers and thunderstorms late tonight (under 0.10 in. of rain possible, more in storms),
• A mix of clouds and sun with a slight (20%) chance of AM showers and thunderstorms, a bit cooler with a (40%) chance of showers and a slight (20%) chance of thunderstorms Monday afternoon (0.10 in. of rain possible, more in storms), just partly cloudy and a bit cooler at night and Tuesday AM, mostly sunny but cooler in the afternoon, mostly clear Tuesday night,
• Partly cloudy in the AM, mostly sunny and a bit cooler Wednesday afternoon, then mostly clear at night.
• snow level above 8,000 ft. tonight and Monday, free air freezing level 13,000 ft. Monday night and Tuesday, 13,000 ft. falling to 12,000 ft.Tuesday night, 12,000 ft. rising to 13,000 ft. Wednesday, then 13,000 ft. Wednesday night.
• lows 54-42 highs 73-68.
• Mostly sunny and a bit warmer Thursday, mostly clear Thursday night,
• Mostly sunny Friday, Saturday, and Sunday (a bit cooler), mostly clear each night.
• free air freezing level 13,000 ft. rising to 14,000 ft. Thursday, 14,000 ft. rising to 15,000 ft. Thursday night, 15,000 falling to 14,000 ft. Friday afternoon, 14,000 ft.Friday night through Saturday night, then 14,000 ft. falling to 13,000 ft. Sunday.
• highs 72-69 lows near 46.

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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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