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May 11, 2022

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

  • FREEZE WARNING IS IN EFFECT  FROM 2 AM UNTIL 8 AM TODAY FOR THE UPPER HOOD RIVER VALLEY, THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANCE OF WESTERN OREGON, THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON, AND THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON.
  • FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 8 AM TODAY FOR THE GREATER PORTLAND METRO AREA,THE CENTRAL WILLAMETTE VALLEY, AND  SOUTH WILLAMETTE VALLEY.
  • FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 8 AM TODAY FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, AND CENTRAL DOUGLAS COUNTY.
  • FREEZE WARNING IS IN EFFECT FROM 2 AM UNTIL 8 AM TODAY FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.

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

  • An Upper Level Low Pressure Trough (“U” shape) is moving inland assuring frontal systems will move through bringing even more rain. The graphics for days 1-3 show a frontal system moving through the Pacific Northwest Thursday. The graphics for days 3-7  Saturday through Wednesday show frontal activity increasing through the period.

Forecast for the South Willamette Valley including Eugene-Springfield:

  • Partly cloudy with areas of frost to start, mostly cloudy and a bit cooler this afternoon, becoming cloudy with a slight (20%) chance of evening rain, a good (50%) chance of rain late tonight (under 0.10 in. of rain possible),
  • Mostly cloudy and a bit cooler with rain Thursday (0.25 in. of rain possible), mostly cloudy with a good (50%) chance of evening rain, partly cloudy late at night,
  • Mostly cloudy and a bit warmer with rain Friday afternoon, then rain late Friday night.
  • highs 60-54 warming to 58 Friday lows 44-38 warming to 50 Friday night.
  • Cloudy with AM rain likely (70%), a bit warmer with a good (50%) chance of rain Saturday afternoon, mostly cloudy with a (30%) chance of showers Saturday night,
  • Mostly cloudy and a bit cooler with a (40%) chance of rain Sunday, a slight (20%) chance of showers at night,
  • Mostly cloudy and a bit cooler with a slight (20%) chance of showers Monday, partly cloudy with a slight (20%) chance of showers Monday night,
  • Then a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Tuesday.
  • highs 68-63 lows 52-43. (Seasonal Averages high 67 low 43)

Forecast for the Umpqua Valley including Roseburg:

  • Partly cloudy with areas of AM frost, becoming mostly cloudy and a bit warmer this afternoon a (30%) chance of rain tonight (under 0.10 in. of rain possible, evening snow level 3,000 ft.),
  • Mostly cloudy with rain and a bit cooler Thursday (0.10 in. of rain possible, AM snow level 3,000 ft.), a good (50%) of evening rain, a slight (20%) chance of showers late at night (snow level 3,000 ft.),
  • Mostly cloudy with a slight (20%) chance of AM rain, rain likely (70%) and a bit warmer Friday afternoon, evening rain, then rain likely (70%) late  night.
  • highs 63-55 warming to 59 Friday lows 44-42 warming to 52 Friday night.
  • Mostly cloudy and a bit warmer with a good (50%) chance of rain Saturday, a slight (20%) chance of rain Saturday night,
  •  Mostly cloudy and a bit cooler with a slight (20%) chance of rain Sunday, a slight (20%) chance of rain at night,
  • Mostly cloudy and a bit cooler with a slight (20%) chance of rain Monday, partly cloudy Monday night,
  • Mostly cloudy with a slight (20%) chance of AM rain, then partly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday afternoon.
  • highs 73-64 lows 52-44. (Seasonal Averages high 70 low 47).

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

  • Partly cloudy start patchy AM fog and inland areas of frost, mostly cloudy and a bit cooler this afternoon, cloudy with a good (50%) chance of evening coastal rain and coastal rain likely (70%) late tonight while a good (50%) chance of inland rain tonight (under 0.10 in. of rain possible),
  • Mostly cloudy and a bit cooler with rain Thursday (0.50 in. of rain possible), a (30%) chance of evening rain, a slight (20%) chance of showers late at night (under 0.10 in. of rain possible),
  • Mostly cloudy with a good (50%) chance of AM rain, a bit warmer with rain likely (70%) Friday afternoon, evening rain, then rain likely (70%) late Friday night.
  • highs 53-58 lows 44-42 warming to 49 Friday night.
  • Mostly cloudy and a bit warmer with a good (50%) chance of rain Saturday, a slight (20%) chance of rain Saturday night,
  • Mostly cloudy and a bit cooler with a (30%) chance of rain Sunday, mostly cloudy with a slight (20%) chance of rain at night,
  • Mostly cloudy with a slight (20%) chance of AM rain, just mostly cloudy and a bit cooler Monday afternoon, partly cloudy in the evening, mostly cloudy late Monday night,
  • Mostly cloudy with a slight (20%) chance of AM rain, then partly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday afternoon.
  • highs 64-60 lows 49-44. (Seasonal Averages high 60 low 47)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • AM sun, partly cloudy and a bit cooler this afternoon, becoming cloudy with a slight (20%) chance of evening rain or snow, a good (50%) chance of rain or snow late tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with rain or snow and a bit cooler Thursday (2-5 in. of snow possible), evening rain or snow likely (70%), a slight (20%) chance of rain or snow showers late at night (2 in. of snow possible),
  • Mostly cloudy  with a slight (20%) chance of rain or snow, a bit warmer with rain or snow Friday afternoon, then rain Friday night.
  • free air freezing level 4,000 ft. rising to 5,500 ft. this afternoon, 4,000 ft. rising to 5,500 ft. late tonight, 3,500 ft. rising to 4,500 ft. Thursday afternoon, 3,500 ft. late Thursday night, 3,500 ft. rising to 5,000 ft. Friday afternoon, then 6,5000 ft. rising to 8,000 ft. late Friday night.
  • highs 46-39 warming to 43 Friday lows 29-37.
  • Mostly cloudy AM rain likely (70%), a bit warmer with a good (50%) chance of rain Saturday afternoon, a slight (20%) chance of rain Saturday night,
  • Mostly cloudy with a (40%) chance of rain Sunday, a good (50%) chance of evening showers, a slight (20%) chance of showers  at night,
  • Clouds and sun with a (30%) chance of AM showers, just a mix of clouds and sun and a bit cooler Monday afternoon, partly cloudy Monday night,
  • Then a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Tuesday.
  • snow level above 8,000 ft. Saturday through Sunday, 8,000 ft. falling t0 7,000 ft. late Sunday night, 6000 ft. Monday morning, free air freezing level 9,000 ft. Monday afternoon, 9,000 ft. falling to 8,000 ft. late Monday night, then snow level 5,000 ft. Tuesday afternoon.
  • highs 55-49 lows 32-39.