Here is my weekly weather quiz question. What are “Backing Winds?” 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) has taken over control of the Pacific Northwest weather bringing lots of sunshine. The graphics for days 1-3 show the weak frontal system that moved through Oregon and brought some short-lived cooling. Now a rapid warm up. The graphics for days 3-7 show frontal system movement Sunday through Tuesday.

 

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 15 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 4 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

• A HEAT ADVISORY IS IN EFFECT FROM NOON UNTIL 9 PM SATURDAY FOR THE NORTH OREGON COAST, THE CENTRAL OREGON COAST.
• A HEAT ADVISORY IS IN EFFECT FROM NOON FRIDAY UNTIL NOON SATURDAY FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA GORGE, THE NORTHERN OREGON CASCADES FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY, THE NORTHERN OREGON CASCADES, THE CASCADES IN LANE COUNTY, AND THE UPPER HOOD RIVER VALLEY.
• AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM SATURDAY AFTERNOON THROUGH SUNDAY EVENING FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA GORGE, THE NORTHERN OREGON CASCADES FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY, THE NORTHERN OREGON CASCADES, THE CASCADES IN LANE COUNTY, AND THE UPPER HOOD RIVER VALLEY.
• A HEAT ADVISORY IS IN EFFECT FROM 11 AM SATURDAY UNTIL 8 PM SUNDAY FOR THE SOUTH CENTRAL OREGON COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS,
• A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM TONIGHT FOR THE CURRY COUNTY COAST.
• AN EXCESSIVE HEAT WARNING IS IN EFFECT  IS IS EFFECT FROM 11 AM SATURDAY UNTIL 8 PM SUNDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• 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:

• Clear tonight,
• Sunny and Hot Friday and Saturday, clear both nights,
• Mostly sunny and still hot but a bit cooler Sunday, then partly cloudy Sunday night.
• lows 50-58 highs 95-100 cooling to 93 Sunday.
• Partly cloudy Monday AM, sunny and much cooler in the afternoon, becoming cloudy late Monday night and Tuesday AM, partly cloudy and a bit cooler in the afternoon at night,
• A mix of clouds and sun in the AM, sunny and a bit cooler Wednesday afternoon, clear in the evening, becoming mostly cloudy late Wednesday night,
• AM clouds and sun, then mostly sunny Thursday afternoon.
• highs 80-74 lows 53-50. (seasonal averages high 75 low 49)

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Eugene-Springfield Pollen Count

Grass………. Very High (266)

Trees………. High (92)

Last Counted: 6/22/17

Data Courtesy of Oregon Allergy Associates.

 

 

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Forecast for Roseburg:

• Clear tonight,
• Sunny and a warmer, quite HOT, Friday and Saturday, clear each night,
• Sunny and still hot but a bit cooler Sunday, then partly cloudy with a slight (20%) chance of thunderstorms at night.
• lows 52-63 highs 93-103 cooling to 98 Sunday.
• Mostly sunny and a bit cooler Monday with a slight (20%) chance of thunderstorms in the afternoon and evening, clear Monday night,
• Mostly sunny and a bit cooler Tuesday, Wednesday and  Thursday, mostly clear at night,
• highs 84-78 lows near 55. (seasonal averages high 78 low 53)

 

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

• Clear tonight and breezy (Wind: N 15-25 mpg decreasing to N 10-15 mph late tonight at the shore while  N 10-20 mph inland decreasing to N 5-10 mph late tonight),
• Patchy AM fog, sunny and a bit warmer Friday, clear at night,
• Sunny and a bit warmer Saturday with areas of afternoon coastal fog and drizzle, clear in the evening, mostly cloudy with areas of coastal fog and drizzle late Saturday night while clear inland Saturday night.
• Areas of fog and drizzle in the AM, patchy drizzle  and a bit cooler Sunday afternoon, partly cloudy with patchy drizzle and a slight (20%) chance of  thunderstorms in the evening, then mostly clear with patchy fog late Sunday night.
• lows 54-57 cooling to 55 Tuesday night highs 70-80 cooling to 67 Sunday.
• Sunny with patchy AM fog and drizzle, patchy fog and a bit cooler Monday afternoon, mostly clear with patchy evening fog, partly cloudy late at night and Tuesday AM, sunny in the afternoon, mostly clear at night,
• Then mostly sunny Wednesday and Thursday, mostly clear Wednesday night.
• highs near 62 lows near 52. (seasonal averages high 62 low 51)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit warmer Friday, clear at night,
• Sunny and hot Saturday, clear Saturday night.
• Mostly sunny in the AM, partly cloudy and a bit warmer Sunday afternoon, partly cloudy with a slight (20%) chance of  thunderstorms at night.
• free air freezing level 16,000 ft. tonight through Sunday evening, then snow level above 8,000 ft. late Sunday night.
• lows 45-56 highs 80-88.
• Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms and a bit cooler in the afternoon and evening, just partly cloudy late Monday night and Tuesday AM, mostly sunny but a bit cooler in the afternoon, mostly clear Tuesday night,
• Then mostly sunny and a bit cooler Wednesday and Thursday, mostly clear Wednesday night.
• snow level above 8,000 ft. Monday and in the evening, free air freezing level 13,000 ft. late Monday night, 13,000 ft. falling to 12,000 ft. Tuesday afternoon, then 12,000 ft. Tuesday night through Thursday.
• highs 74-65 lows 47-42.

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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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