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June 5, 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

  • A FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING FOR THE GRANDE RONDE VALLEY, THE NORTHERN BLUE MOUNTAINS OF OREGON, THE SOUTHERN BLUE MOUNTAINS OF OREGON, THE JOHN DAY BASIN, THE FOOTHILLS OF NORTHERN BLUE MOUNTAINS OF OREGON, THE FOOTHILLS OF SOUTHERN BLUE MOUNTAINS OF OREGON, AND WALLOWA COUNTY.
  • A FLOOD ADVISORY IS IN EFFECT UNTIL 10:30 PM TONIGHT FOR UMATILLA AND UNION COUNTIES IN OREGON.
  • 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) will help increase the frontal activity over Oregon. The graphics for days 1-3 show the frontal system that’s sliding through today. The graphics for days 3-7   Wednesday through Sunday show the frontal activity approaching the Pacific Northwest Wednesday through next Sunday.
  • Note: The Hurricane season has officially begun. Hurricane Agatha struck southern Mexico and fell apart. It’s remnants redeveloped in the Gulf of Mexico and moved across South Florida producing torrential rains, then moved over the Atlantic Ocean.

Forecast for the South Willamette Valley including Eugene-Springfield:

  • Mostly cloudy with evening showers likely (70%) and a slight (20%) chance of thunderstorms, a slight (20%) chance of showers late tonight (0.25 in. of rain possible, more in storms),
  • Mostly cloudy with a slight (20%) chance of AM showers, a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Monday afternoon (under 0.10 in. of rain possible), partly cloudy with a slight (20%) chance of evening showers, mostly clear late Monday night,
  • A mix of clouds and sun and a bit warmer Tuesday, mostly cloudy with a (40%) chance of rain at night,
  • Mostly cloudy start, partly cloudy and a bit cooler Wednesday afternoon, then mostly cloudy Wednesday night.
  • lows 52-45 warming to 53 Tuesday night cooling to 52 Wednesday night highs 69-76.
  • A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain Thursday afternoon, mostly cloudy with a good (50%) chance of rain Thursday night,
  • A mix of clouds and sun and a bit warmer with a good (50%) chance of rain Friday afternoon, mostly cloudy with a good (50%) chance of rain at night,
  • Mostly cloudy with a a good (50%) chance of AM rain, partly cloudy and a bit cooler with a good (50%) chance of rain Saturday afternoon, mostly cloudy with a (40%) chance of rain Saturday night,
  • Then a mix of clouds and sun and a bit cooler with a (40%) chance of rain Sunday.
  • highs 76-79 cooling to 72 Sunday lows 57-52. (Seasonal Averages high 72 low 46)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, showers likely (70%) late tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with a (30%) chance of AM showers, just partly cloudy and slightly cooler Monday afternoon, mostly clear in the evening, partly cloudy Monday night,
  • Partly cloudy start, mostly cloudy and warmer Tuesday afternoon, mostly cloudy with a slight (20%) chance of showers at night,
  • Mostly cloudy and a bit warmer Wednesday, then partly cloudy in the evening, then mostly cloudy late Wednesday night.
  • lows 52-49 warming to 56 Tuesday night cooling to 53 Wednesday night highs 70-78.
  • Mostly cloudy Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night,
  • Partly cloudy and a bit warmer with a slight (20%) chance of showers Friday, a (40%) chance of showers at night,
  • Mostly cloudy with a (40%) chance of showers and a bit cooler Saturday, a (30%) chance of showers Saturday night,
  • Mostly cloudy with a slight (20%) chance of AM showers, then partly cloudy and a bit cooler with a slight (20%) chance of showers Sunday afternoon.
  • highs 78-82 cooling to 74 Sunday lows 60-62 cooling to 4 Saturday night. (Seasonal Averages high 74 low 51).

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

  • Mostly cloudy with coastal showers likely (70%) while a good (50%) chance of inland showers tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with a slight (20%) chance of AM showers, just partly cloudy Monday afternoon, mostly clear in the evening, partly cloudy late Monday night,
  • Some AM clouds, mostly cloudy Tuesday afternoon, mostly cloudy with a (30%) chance of showers at night (under 0.10 in. of rain possible),
  • Mostly cloudy and a bit warmer Wednesday, mostly cloudy Wednesday night.
  • lows 50-48 warming to 52 Tuesday night cooling to 49 Wednesday night highs 65-68.
  • Mostly cloudy and a bit cooler Thursday, a slight (20%) chance of showers Thursday night,
  • Mostly cloudy and a bit warmer with a (30%) chance of showers Friday and at night,
  • Mostly cloudy and a bit cooler with a (40%) chance of showers Saturday, a (30%) chance of showers Saturday night,
  • Then mostly cloudy with a (30%) chance of showers Sunday.
  • highs 65-69 cooling to 65 Sunday lows 55-52. (Seasonal Averages high 63 low 50)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with evening showers and a (40%) chance of thunderstorms  this evening, a good (50%) chance of showers late tonight (0.50 in. of rain possible, more in storms),
  • Mostly cloudy with a good (50%) chance of AM showers, a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Monday afternoon, just partly cloudy Monday night,
  • Mostly sunny and warmer Tuesday, mostly cloudy with a (40%) chance of rain at night,
  • Mostly cloudy start, a mix of clouds and sun and a bit cooler Wednesday afternoon, then mostly cloudy Wednesday night.
  • snow level 7,000 ft. tonight, 6,500 ft. Monday, free air freezing level 12,000 ft. Monday night, 12,000 ft. Tuesday, snow level above 8,000 ft. Tuesday night, then free air freezing level 12,000 ft. Wednesday and      Wednesday night.
  • lows 39-35 warming 44 Tuesday night highs 52-66 cooling to 63 Wednesday.
  • A mix of clouds and sun and a bit warmer Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night,
  • Clouds and sun with a slight (20%) chance of AM rain, a mix of clouds and sun and a bit warmer with a (40%) chance of rain Friday afternoon, mostly cloudy with a good (50%) chance of rain at night,
  • A mix of clouds and sun and a bit cooler with a good (50%) chance of rain Saturday, mostly cloudy with a (40%) chance of rain Saturday night,
  • Then a mix of clouds and sun and a bit cooler with a (40%) chance of rain Sunday.
  • free air freezing level 13,000 ft. Thursday, snow level above 8,000 ft. Thursday night through Saturday, above 8,000 ft. falling to 8,000 ft. late Saturday night, then 7,000 ft. Sunday.
  • highs 66-68 cooling to 63 Sunday lows 46-48 cooling to 42 Tuesday night.