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) has taken over control of the Pacific Northwest weather bringing lots of sunshine and even more heat. The graphics for days 3-7 show frontal system movement over the Pacific Northwest Tuesday.

 

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 93 in the Moderate category measuring Ozone.

Oakridge: The Air Quality Index is 17 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 100 in the Moderate category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

• A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM THIS EVENING FOR THE COAST RANGE OF NORTHWEST OREGON,  THE CENTRAL COAST RANGE OF WESTERN OREGON THE SOUTH WILLAMETTE VALLEY.
• A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM SUNDAY FOR THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA GORGE, THE NORTHERN OREGON CASCADES FOOTHILLS, AND THE CASCADE FOOTHILLS IN LANE COUNTY.
• AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 8 PM SUNDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, JACKSON COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• A FIRE WEATHER WATCH IS IN EFFECT UNTIL 11 AM MONDAY FOR THE EASTERN ROGUE RIVER VALLEY AND THE WESTERN ROGUE BASIN.
• A FIRE WEATHER WATCH IS IN EFFECT UNTIL 5 PM MONDAY FOR 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,
• Mostly sunny and still hot but a bit cooler Sunday, partly cloudy with a slight (20%) chance of showers and thunderstorms late Sunday night,
• Mostly cloudy Monday AM, partly cloudy and much cooler in the afternoon and evening, becoming cloudy late Monday night and Tuesday AM, then partly cloudy and a bit cooler in the afternoon at night.
• lows 57-50 highs 92-75
• Partly cloudy and a bit cooler Wednesday and in the evening, becoming mostly cloudy late Wednesday night,
• AM clouds and sun, mostly sunny and a bit warmer Thursday afternoon, mostly clear at night,
• Then mostly sunny and a bit warmer Friday and Saturday, mostly clear Friday night.
• highs 74-79 lows 50-53. (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:

• Clear tonight,
• Sunny in the AM, partly cloudy and still hot but a bit warmer with a slight (20%) chance off thunderstorms Sunday afternoon, partly cloudy with a slight (20%) chance of isolated thunderstorms at night,
• Partly cloudy and much cooler Monday with a slight (20%) chance of thunderstorms in the afternoon, mostly clear in the evening, mostly cloudy late Monday night,
• Then partly cloudy and a bit cooler Tuesday and at night.
• lows 63-53 highs 96-78.
• Mostly cloudy Wednesday AM, sunny in the afternoon, mostly clear Wednesday night,
• Mostly sunny Thursday, mostly clear at night,
• Mostly sunny and a bit warmer Friday and Saturday, mostly clear Friday night.
• highs 78-83 lows 54-56. (seasonal averages high 78 low 53)

 

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

• Mostly clear this evening at the shore and mostly cloudy with patchy coastal fog late tonight while clear inland tonight,
• Cloudy with patchy coastal fog Sunday while sunny Sunday AM inland and party cloudy inland Sunday afternoon, partly cloudy in the evening and mostly cloudy with patchy fog and a slight (20%) chance of  coastal thunderstorms late at night while partly cloudy in the evening inland and patchy fog with a slight (20%) chance of inland thunderstorms late Sunday night,
• Mostly cloudy with patchy AM coastal fog and drizzle and just mostly cloudy a bit cooler Monday afternoon while a slight (20%) chance of AM thunderstorms inland and just mostly cloudy inland late at night,
• Then partly cloudy and a bit cooler Tuesday and at night.
• lows 56-52 highs 66-62.
• Partly cloudy Wednesday through Thursday, mostly clear Thursday evening, partly cloudy late Thursday night,
• Partly cloudy in the AM, sunny and a bit warmer Friday afternoon, mostly clear at night,
• Then mostly sunny and a bit warmer Saturday.
• highs 62-65 lows 52-52. (seasonal averages high 63 low 51)

 

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Forecast for the Cascades in Lane County:

• Clear tonight.
• Mostly sunny and warm Sunday, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers and thunderstorms late Sunday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers and thunderstorms Monday, just partly cloudy at night and Tuesday AM, mostly sunny but cooler in the afternoon, then partly cloudy Tuesday night.
• free air freezing level 16,000 ft. tonight, 16,000 ft. falling to 15,000 ft. Sunday, snow level above 8,000 ft. Sunday night and Monday, free air freezing level 14,000 ft. falling to 13,000 ft. late Monday night, 13,000 ft. Tuesday, then 13,000 ft. falling to 12,000 ft.Tuesday night.
• lows 59-42 highs 88-68.
• Partly cloudy and a bit cooler Wednesday, mostly clear at night,
• Mostly sunny and a bit warmer Thursday, mostly clear Thursday night,
• Mostly sunny and a bit warmer Friday and Saturday, mostly clear Friday night.
• free air freezing level 12,000 ft. rising to 13,000 ft. Wednesday, 13,000 ft. Wednesday night, 13,000 ft. rising to 14,000 ft. Thursday, 14,000 ft. rising to 15,000 ft. Thursday night, 15,000 Friday and Friday night, then 15,000 ft. falling to 14,000 ft. Saturday.
• highs 65-72 lows 42-45.

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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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