Here is my new 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) is taking over giving us easterly offshore airflow which will heat us up to record high temperatures. The graphics for days days 1-3 show a weak frontal system that only brushed the extreme northern part of Oregon Sunday, but it has had no effect on our weather. The graphics for days 3-7 show frontal systems approaching late in the week. That’s when the slow cooling starts.

Note: Prepare yourself for much hotter weather through Thursday. Take proper precautions to keep hydrated and cool.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 10 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

• AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM TUESDAY AFTERNOON THROUGH  THURSDAY AFTERNOON FOR THE NORTH OREGON COAST.
• AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM TUESDAY AFTERNOON THROUGH  FRIDAY EVENING FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF OF WESTERN OREGON, THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA GORGE, THE CENTRAL COLUMBIA RIVER GORGE, THE NORTHERN OREGON CASCADE 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 WARNING IS IN EFFECT FROM NOON TODAY THROUGH 11 PM WEDNESDAY FOR THE CURRY COUNTY COAST.
• AN EXCESSIVE HEAT WARNING IS IN EFFECT FROM NOON TUESDAY THROUGH 8 PM THURSDAY FOR
• AN EXCESSIVE HEAT WARNING IS IN EFFECT FROM NOON TUESDAY THROUGH 8 PM THURSDAY FOR THE SOUTH CENTRAL OREGON COAST, CENTRAL DOUGAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• A HEAT ADVISORY IS IN EFFECT FROM NOON TUESDAY UNTIL 8 PM THURSDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• The Oregon Health Authority issued a Health Advisory for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• A Health Advisory remains in effect for Odel Lake, located 75 miles southeast of Eugene off highway 58  in the northwest corner of Klamath County. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. 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 sessitivities may experience a puffy, red rash at the affected area.
• The Oregon Health Authority has updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• 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 HOT today, clear tonight,
• Sunny and Very Hot Tuesday and Wednesday, clear both nights.
• highs 93-106 lows 55-62.
• Sunny and even Hotter with record breaking high Thursday, mostly clear Thursday night,
• Mostly sunny, slightly cooler but still Very Hot Friday, mostly clear at night,
• Mostly sunny and a bit cooler Saturday, mostly clear Saturday night,
• Then mostly sunny and a bit cooler Sunday.
• highs 105-87 lows 62-55. (seasonal averages high 84 low 52)

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Eugene-Springfield Pollen Count
Grass………. Moderate (18)
Trees………. Low (2)
Last Counted: 7/27/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season just about over.

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Forecast for Roseburg:

• Sunny and a bit warmer today, clear tonight,
• Sunny and Hot Tuesday, clear Tuesday night,
• Sunny and Very Hot with possible record breaking temperatures Wednesday, then clear at night.
• highs 97-110 lows 62-66.
• Sunny and Very Hot with possible record breaking temperatures Thursday, mostly clear Thursday night,
• Partly cloudy and a bit cooler but still hot Friday, partly cloudy at night,
• Sunny and continued a bit cooler Saturday and Sunday, partly cloudy both nights,
• Then sunny and a bit cooler but still warm Sunday.
• highs 107-92 lows 66-60. (seasonal averages high 86 low 57)

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

• Sunny and a bit warmer today, mostly clear tonight with patchy coastal fog late at night and Tuesday AM, sunny and a bit warmer in the afternoon, mostly clear Tuesday night,
• Mostly sunny and a bit warmer Wednesday, then mostly clear at night.
• highs 72-79 lows 55-58.
• Sunny and a bit cooler Thursday, clear in the evening, partly cloudy and a bit cooler late Thursday night through Sunday.
• highs 72-63 lows 56-58 cooling to 54 Saturday night. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Sunny and a bit warmer today, clear tonight,
• Sunny and Very Hot Tuesday, clear at night,
• Mostly sunny and even hotter Wednesday, then mostly clear at night.
• free air freezing level above 12,000 ft. tonight through Wednesday night.
• highs 85-93 lows 56-62.
• Mostly sunny Thursday, mostly clear Thursday night,
• Mostly sunny Friday AM, partly cloudy and a bit cooler in the afternoon, just partly cloudy at night,
• Mostly sunny Saturday AM, partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms  in the afternoon and evening, just partly cloudy  Saturday night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Sunday afternoon.
• free air freezing level above 12,000 ft. Thursday through Saturday AM, snow level above 8,000 ft. Saturday afternoon and evening, free air freezing level 12,000 ft. late Saturday night and Sunday AM, then snow level above 8,000 ft. Saturday afternoon.
• highs 93-80 lows 62-53.

 

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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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