Partly cloudy late tonight, plenty of sunshine and a bit cooler Saturday.

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ADVISORIES:

  • A RED FLAG WARNING IS IN EFFECT UNTIL 8 PM THIS EVENING FOR STRONG GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR THE EAST SLOPES OF THE NORTHERN OREGON CASCADES,THE KLAMATH BASIN AND THE FREMONT-WINEMA NATIONAL FOREST.
  • AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 8 PM THIS EVENING FOR THE LOWER COLUMBIA BASIN OF OREGON, THE JOHN DAY BASIN, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, NORTH CENTRAL OREGON, CENTRAL OREGON, THE GRANDE RONDE VALLEY, WALLOWA COUNTY, THE NORTHERN BLUE MOUNTAINS OF OREGON, THE SOUTHERN BLUE MOUNTAINS OF OREGON, THE OCHOCO, THE JOHN DAY HIGHLANDS, AND THE NORTHWEST BLUE MOUNTAINS.
  • AN AIR QUALITY ALERT IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE KLAMATH BASIN.

HEALTH ADVISORIES:

  • THE OREGON HEALTH AUTHORITY HAS ISSUED A RECREATIONAL USE HEALTH ADVISORY FOR ODELL LAKE IN KLAMATH COUNTY DUE TO THE PRESENCE OF CYANOBACTERIA (HARMFUL ALGAE) BLOOM THAT HISTORICALLY PRODUCES CYANOTOXINS (HARMFUL ALGAE TOXINS) ABOVE RECREATIONAL GUIDELINE VALUES FOR HUMAN EXPOSURE. UNTIL THE ADVISORY IS LIFTED PEOPLE SHOULD AVOID SWIMMING AND HIGH-SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE LAKE WHERE BLOOMS ARE IDENTIFIED. ALTHOUGH TOXINS ARE NOT ABSORBED THROUGH THE SKIN, PEOPLE WITH SKIN SENSITIVITIES MAY EXPERIENCE A PUFFY RED RASH. VISITING ODELL LAKE IS SAFE AS LONG AS ANY BOATING OR OTHER ACTIVITIES DO NOT CAUSE EXCESSIVE WATER SPRAY WHICH COULD LEAD TO INHALATION RISKS IF THERE IS EXCESSIVE WATER SPRAY.

 

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THE WEATHER PATTERN:

  • An Upper Level Low Pressure Trough (Shaded “U” shape with arrows) will help bring cooler weather. I went with the computer models and forecast a bit cooler today just like I have done for the last two days, but this time it actually happened. The graphics for days 1-3 show a couple of waves of cooler air headed our way. The graphics for days 3-7 Monday through next Friday show a frontal system pushing through Monday. Yet another complex frontal system will move in Thursday.

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THE AIR QUALITY INDEX:

For the local area:

Eugene/Springfield: The Air Quality Index is 17 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 15 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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FORECASTS:

Forecast for the Southern Willamette Valley including Eugene-Springfield

  • Becoming partly cloudy late tonight,
  • AM clouds and sun, mostly sunny and a bit cooler Saturday afternoon, mostly clear Saturday night,
  • AM sun, partly cloudy and a bit warmer Sunday afternoon, partly cloudy at night,
  • Partly cloudy and a bit cooler Monday with a slight (20%) chance of AM rain, then mostly clear Monday night.
  • lows 55-53 highs 83-85 cooling to 82 Monday.
  • Mostly sunny Tuesday, clear Tuesday night,
  • Sunny Wednesday and Thursday, clear both nights,
  • Then mostly sunny Friday.
  • highs near 82 lows 54-52. (seasonal averages high 84 low 52)

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Eugene-Springfield Pollen Count:

Grass………. LOW (3)

Trees………. LOW (5)

Last Counted: 7/31/20

Data Courtesy of Oregon Allergy Associates

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Forecast for the Umpqua Valley including Roseburg:

  • Mostly clear and hazy late tonight,
  • Hazy with some AM clouds, sunny and hazy and a bit cooler Saturday afternoon, mostly clear and hazy late Saturday night,
  • Some AM clouds, sunny Sunday, mostly clear at night,
  • Partly cloudy and a bit cooler Monday, then mostly clear Monday night.
  • lows near 60 highs 88-85.
  • Mostly sunny and a bit warmer Tuesday, clear Tuesday night,
  • Sunny and a bit warmer Wednesday and Thursday, clear both nights,
  • Then mostly sunny Friday.
  • highs near 87 lows near 58. (seasonal averages high 86 low 57)

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Forecast for the Oregon Coast including Coos Bay and North Bend

  • Becoming mostly cloudy with patchy coastal fog late tonight,
  • Mostly cloudy with patchy AM coastal fog, sunny and a bit warmer Saturday afternoon, partly cloudy  with patchy coastal fog late Saturday night,
  • Partly cloudy Sunday and at night,
  • Am clouds, partly cloudy Monday afternoon and Monday night.
  • lows 55-57 cooling to 54 Monday night highs near 72.
  • Partly cloudy Tuesday, mostly clear Tuesday night,
  • Mostly sunny Wednesday and Thursday, mostly clear both nights,
  • Then  mostly sunny Friday.
  • highs near 72 lows near 53 (seasonal averages high 65 low 53)

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Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Becoming partly cloudy late tonight,
  • Some AM clouds, mostly sunny and a bit cooler Saturday afternoon, clear Saturday night,
  • Mostly sunny and a bit cooler Sunday, mostly clear at night,
  • Mostly sunny and a bit cooler Monday with a slight (20%) chance of afternoon showers, then becoming partly cloudy Monday night.
  • free air freezing level 15,000 ft. tonight and Saturday, 16,000 ft. Saturday night, 16,000 ft. falling to 15,000 ft. Sunday afternoon, 14,000 ft. Sunday night, snow level above 8,000 ft. Monday, then free air freezing level 15,000 ft. Monday night.
  • lows 49-43 highs 76-69.
  • Mostly sunny and a bit warmer Tuesday, clear Tuesday night,
  • Sunny and a bit warmer Wednesday, clear at night,
  • Then sunny and a bit cooler Thursday and Friday, clear Thursday night.
  • free air freezing level 16,000 ft. falling to 15,000 ft. Tuesday afternoon, then 15,000 ft. Tuesday night through Friday.
  • highs 73-75 cooling back to 73 Friday lows near 48.

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Note: Weather is a constantly changing phenomenon and weather forecasting is a combination of science, experience, and intuition. The accuracy of any given forecast can change due to unexpected changes in atmospheric conditions, so there are no guarantees that the actual weather will conform to the projected forecast.

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For all of your Lane County and Eugene-Springfield News, Weather and Sports go to: eugenedailynews.com

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