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August 1, 2023

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 chance due to unexpected changes in atmospheric conditions, so there are no guarantees the the actual weather will conform to the projected forecast.

ADVISORIES

  • AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL NOON TODAY FOR EASTERN PORTIONS OF LANE COUNTY. THIS DOES NOT INCLUDE THE EUGENE-SPRINGFIELD AREA.
  • AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL NOON WEDNESDAY FOR THE CASCADE FOOTHILLS IN LANE COUNTY AND THE CASCADES IN LANE COUNTY.
  • AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL NOON WEDNESDAY FOR DESCHUTES COUNTY.

HEALTH ADVISORIES

  • A RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR GALESVILLE RESERVOIR IN DOUGLAS COUNTY DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE RESERVOIR WHERE BLOOMS ARE, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER, THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. THE OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE GALESVILLE RESERVOIR AND ENJOY ACTIVITIES SUCH AS FISHING, CAMPING, HIKING, BILKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY.. SPRAYS COULD LEAD TO THE RISK OF INHALING CYANOTOXINS.
  • A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER 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.

THE WEATHER PATTERN

  • An Upper Level Low Pressure Trough (“U” shape) keeps our weather pattern stable with normal temperatures. The graphics for days 1-3  show a cold front pushing through the Pacific Northwest today and Wednesday.  The graphics for days 3-7   Friday through Tuesday show a frontal system well offshore through next Tuesday. So far the wildfire smoke has been staying in Eastern Lane County, but if the winds shift that might not be the case.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Sunny and a bit warmer today, clear tonight,
  • Sunny and a bit cooler Wednesday, partly cloudy at night,
  • Some AM clouds, sunny Thursday afternoon, then mostly clear Thursday night.
  • highs 92-90 lows 52-54.
  • Mostly sunny Friday, mostly clear Friday night,
  • Mostly sunny and a bit warmer Saturday and Sunday, mostly clear both nights,
  • Then mostly sunny Monday.
  • highs 90-95 lows 55-57.  (seasonal averages high 86 low 52)

Forecast for the Umpqua Valley including Roseburg:

  • Sunny and a bit warmer today, mostly clear tonight,
  • Sunny Wednesday, mostly clear in the evening, partly cloudy late at night,
  • Mostly sunny and a bit cooler Thursday, then mostly clear Thursday night.
  • highs 92-90 lows near 58.
  • Mostly sunny and a bit warmer Friday, mostly clear Friday night,
  • Sunny and a bit warmer Saturday and Sunday, clear both nights,
  • Then sunny and a bit cooler Monday.
  • highs 90-96 cooling to 94 Monday lows 57-62 (seasonal averages high 88 low 58)

Forecast for the Oregon Coast including Coos Bay and North Bend:

  • AM clouds, sunny and a bit warmer this afternoon, partly cloudy late tonight,
  • Some AM clouds, sunny Wednesday afternoon, mostly clear in the evening, partly cloudy late at night,
  • Then partly cloudy Thursday and Thursday night.
  • highs near 75 lows near 57.
  • Mostly sunny Friday, mostly clear Friday night,
  • Mostly sunny and a bit warmer Saturday,  mostly clear at night,
  • Mostly sunny Sunday, mostly clear in the evening, partly cloudy late Sunday night,
  • Some AM clouds, then sunny and a bit cooler Monday afternoon.
  •  highs 75-77 cooling back to 75 Monday lows 56-59. (seasonal averages high 67 low 54)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Sunny and hazy and a bit warmer today, mostly clear and hazy with areas of evening smoke, mostly clear and hazy late tonight,
  • Mostly sunny and  hazy with areas of smoke and a bit cooler Wednesday, partly cloudy and hazy with areas of smoke at night,
  • Partly cloudy and hazy with areas of smoke and a bit cooler Thursday, then partly cloudy and hazy with areas of smoke Thursday night.
  • free air freezing level 15,000 ft. today and tonight, 14,000 ft. rising to 15,000 ft.  Wednesday afternoon, then 14,000 ft. Wednesday night through Thursday night.
  • highs 80-76 lows near 48.
  • Mostly sunny and hazy with areas of smoke Friday with a slight (20%) chance of afternoon showers and thunderstorms, partly cloudy with a slight (20%) chance of evening showers and thunderstorms, hazy with areas of smoke late Friday night,
  • Mostly sunny and hazy with areas of smoke a bit warmer Saturday with a slight (20%) chance  of showers and thunderstorms in the afternoon, mostly clear with a slight (20%) chance of evening showers and thunderstorms, hazy with areas of smoke late at night,
  • Sunny and hazy with areas of smoke and a bit warmer Sunday, mostly clear and hazy with areas of smoke Sunday night,
  • Then sunny and hazy with areas of smoke and a bit warmer Monday.
  • free air freezing level 14,000 ft. Sunday, then 15,000 ft. Sunday night and Monday.
  • highs 76-83 lows 49-53.