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July 31, 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 TUESDAY FOR EASTERN PORTIONS OF LANE COUNTY. THIS DOES NOW INCLUDE THE EUGENE-SPRINGFIELD AREA.
  • AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL NOON TUESDAY FOR THE CASCADE FOOTHILLS IN LANE COUNTY AND THE CASCADES IN LANE COUNTY.
  • AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 11 AM TUESDAY 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 Monday. The graphics for days 3-7   Thursday through Monday show no frontal activity pushing into or through Oregon during the period until a weak front shows up to our northwest falling apart next Monday. So far the 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 warmer Tuesday, clear at night,
  • Mostly sunny and a bit warmer Wednesday, then mostly clear Wednesday night.
  • highs 87-90 lows near 52.
  • Mostly sunny and a bit cooler Thursday, partly cloudy Thursday night,
  • Mostly sunny and a bit warmer Friday, mostly clear at night,
  • Mostly sunny and a bit warmer Saturday, clear Saturday night,
  • Then sunny and a bit warmer Sunday.
  • highs 89-94 lows 53-56.  (seasonal averages high 86 low 52)

Forecast for the Umpqua Valley including Roseburg:

  • Sunny and a bit warmer today, clear with evening haze, patchy fog late tonight,
  • Sunny and a bit warmer Tuesday, mostly clear at night,
  • Mostly sunny and a bit warmer Wednesday, then mostly clear Wednesday night.
  • highs 87-92 lows 55-58.
  • Mostly sunny and a bit cooler Thursday, mostly clear Thursday night,
  • Mostly sunny and a bit warmer Friday, mostly clear at night,
  • Then sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
  • highs 89-95 lows 57-62 (seasonal averages high 88 low 58)

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

  • AM clouds and patchy fog, sunny and a bit warmer this afternoon, partly cloudy this evening, mostly cloudy late tonight with patchy inland fog late,
  • AM clouds, sunny Tuesday afternoon, mostly clear in the evening, mostly cloudy late at night,
  • Partly cloudy Wednesday, then partly cloudy late Wednesday night.
  • highs near 75 lows near 55.
  • Partly cloudy Thursday and Thursday night,
  • Some AM clouds, sunny Friday afternoon, mostly clear in the evening, partly cloudy late Friday night,
  • Then sunny and a bit warmer Saturday and Sunday, partly cloudy Saturday night.
  •  highs 74-77 lows 56-58. (seasonal averages high 67 low 54)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Sunny and hazy and a bit warmer with areas of smoke today, clear and hazy with areas of smoke tonight,
  • Sunny and hazy with areas of smoke and a bit warmer Tuesday, mostly clear and hazy with areas of smoke at night,
  • Mostly sunny and  hazy with areas of smoke Wednesday, then partly cloudy and hazy with areas of smoke Wednesday night.
  • free air freezing level 13,000 ft. rising to 14,000 ft. this afternoon, 14,000 ft. rising to 15,000 ft. tonight, 15,000 ft. Tuesday through Wednesday, then 14,000 ft. Wednesday night.
  • highs 74-79 lows 45-50.
  • Partly cloudy and hazy with areas of smoke and and a bit cooler Thursday, partly cloudy and hazy with areas of smoke Thursday night,
  • AM sun and haze with areas of smoke, partly cloudy and hazy with areas of smoke Friday afternoon, partly cloudy and hazy with areas of smoke at night,
  • Mostly sunny and hazy with areas of patchy smoke a bit warmer Saturday with a slight (20%) chance  of showers and thunderstorms in the afternoon, mostly clear and hazy with areas of smoke Saturday  night,
  • Sunny and hazy and a bit warmer with areas of smoke Sunday.
  • free air freezing level 14,000 ft. Thursday through through Saturday night, then 15,000 ft. Sunday.
  • highs 77-83 lows 49-52.