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May 20, 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

  • NONE AT THIS TIME.

HEALTH ADVISORIES

A PERMANENT RECREATIONAL HEALTH ADVISORY IS IN EFFECT FOR THE SOUTH UMPQUA RIVER AND MAINSTEM UMPQUA RIVER. THE ADVISORY COVERS THE SOUTH UMPQUA RIVER FROM CANYONVILLE DOWNSTREAM TO THE CONFLUENCE OF THE MAINSTEM UMPQUA RIVER, AND THE MAINSTEM UMPQUA RIVER DOWNSTREAM PAST ELKTON TO LAWSON BAR. PEOPLE IN THE BEDROCK ALONG THE RIVERS EDGE ARE ARE KNOWN TO DEVELOP CYANOBACTERIA (BLUE-GREEN ALGAE) BLOOMS THAT CAN BE HARMFUL TO PETS AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED AT SEVERAL ACCESS AREAS ALONG THE RIVER.

THE WEATHER PATTERN

A blocking  Upper Level High Pressure Ridge (“Arch” shape) still has a hold on the Pacific Northwest. Temperatures have cooled off a bit. The graphics for days 1-3  show no fronts approaching the Pacific Northwest. The graphics for days 3-7   Tuesday through next Saturday show what little frontal activity will occur through the period until a cold front move in between Friday and next Saturday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • A mix of clouds and sun and a bit cooler today, partly cloudy this evening, mostly cloudy late tonight,
  • Partly cloudy and a bit cooler Sunday, mostly clear at night,
  • Mostly sunny start, partly cloudy and a bit cooler Monday afternoon, then partly cloudy Monday night.
  • highs 77-69 lows 52-44.
  • Partly cloudy and a bit warmer Tuesday and Tuesday night,
  • Some AM clouds, mostly sunny and a bit warmer Wednesday, mostly clear at night,
  • Partly cloudy and a bit warmer Thursday and Thursday night,
  • Then partly cloudy Friday.
  • highs 72-75 lows 45-49.  (seasonal averages high 69 low 45)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy and a bit cooler today, mostly cloudy tonight,
  • Mostly cloudy start, partly cloudy and a bit cooler Sunday afternoon, mostly clear at night,
  • Sunny and a bit cooler Monday, then partly cloudy Monday night.
  • highs 76-72 lows 52-47.
  • Partly cloudy and a bit warmer Tuesday, partly cloudy Tuesday night,
  • Then partly cloudy Wednesday through Friday.
  • highs 74-76 lows 48-52. (seasonal averages high 72 low 49)

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

  • Cloudy with a slight (20%) chance of AM showers, just mostly cloudy and a bit warmer this afternoon, mostly cloudy tonight,
  • Mostly cloudy start, partly cloudy Sunday afternoon, mostly clear at night,
  • Mostly sunny Monday, then partly cloudy and breezy Monday night.
  • highs near 65 lows 52-46.
  • Partly cloudy and a bit cooler Tuesday, partly cloudy Tuesday night,
  • Then partly cloudy Wednesday through Friday.
  • highs near 64 lows 46-49. (seasonal averages high 61 low 49)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Partly cloudy and a bit cooler with a good (50%) chance of showers and a slight (20%) chance of thunderstorms this afternoon and evening, partly cloudy with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms),
  • A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Sunday afternoon, just partly cloudy at night,
  • Some AM clouds, mostly sunny and a bit cooler Monday afternoon, then partly cloudy Monday night.
  • snow level above 8,000 ft. tonight through Sunday, free air freezing level 12,000 ft. falling to 11,000 ft. late Sunday night, 11,000 ft. Monday, then 12,000 ft. Monday night.
  • highs 72-58 lows near 47-35.
  • Partly cloudy and a bit warmer Tuesday and Tuesday night,
  • Partly cloudy with a slight (20%) chance of showers Wednesday afternoon and evening, just partly cloudy at night,
  • Partly cloudy with a slight (20%) chance of showers Thursday afternoon and evening, just partly cloudy Thursday night,
  • Then partly cloudy with a slight (20%) chance of showers Friday afternoon.
  • free air freezing level 10,000 ft. Tuesday, 11,000 ft. Tuesday night, snow level 7,500 ft. Wednesday, above 8,000 ft. Wednesday night, 8,000 ft. Thursday, then above 8,000 ft. Thursday night and Friday.
  • highs near 62 lows 37-39.