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February 8, 2024

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 WINTER WEATHER ADVISORY IS IN EFFECT FROM 7 PM THIS EVENING UNTIL 1 PM FRIDAY FOR THE NORTHERN BLUE MOUNTAINS OF OREGON.
  • A WINTER WEATHER ADVISORY IS IN EFFECT FROM 7 PM THIS EVENING UNTIL 1 PM FRIDAY ABOVE 4,000 FT. FOR THE SOUTHERN BLUE MOUNTAINS OF OREGON.

HEALTH ADVISORIES

  • 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

The Upper Level Low Pressure Trough has been moving eastward and has helped move the Atmospheric River  southward away from California. The graphics for days 1-3  show no frontal systems moving into Oregon. The graphics for days 3-7   Sunday through Thursday show complex frontal systems  approaching the Pacific Northwest the pushing through Friday and next Sunday and Monday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Mostly cloudy with a good (50%) chance of showers tonight (o.10 in. of rain possible),
  • Cloudy with AM showers likely (70%), mostly cloudy a good (50%) chance of showers and a bit cooler Friday afternoon (o.25 in. of rain possible), a slight (20%) chance of evening showers, just mostly cloudy with patchy fog late Friday night,
  • Partly cloudy and a bit warmer Saturday, partly cloudy in the evening, mostly cloudy with a good (50%) chance of rain late at night,
  • Mostly cloudy with a good (50%) chance of rain Sunday, then cloudy with a (40%) chance of rain Sunday night.
  • lows 37-35 warming to 40 Sunday night highs 45-50.
  • Mostly cloudy and a bit warmer with a good (50%) chance of rain Monday, a good (50%) chance of rain Monday night,
  • Mostly cloudy and a bit warmer with a good (50%) chance of rain Tuesday, a (40%) chance of rain at night,
  • Mostly cloudy and a bit warmer with a (40%) chance of rain Wednesday, then a (40%) chance of rain Wednesday night and Thursday.
  • highs 52-54 lows 38-40. (seasonal averages high 51 low 35)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with a slight (20%) chance of evening rain and snow showers, rain and snow likely (70%) late tonight (under 0.10 in. of rain possible, no snow accumulation expected, evening snow level 2,000 ft.),
  • Mostly cloudy with AM rain and snow likely (70%), rain likely (70%) Friday afternoon (0.25 in. of rain possible, snow level 2,000 ft. rising to 3,000 ft.), a  (30%) chance of evening showers, just mostly cloudy with patchy fog late Friday night,
  • Some AM clouds with patchy fog, sunny and a bit warmer Saturday afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late Saturday night,
  • Mostly cloudy with a (30%) chance of rain Sunday, then a slight (20%) chance of rain Sunday night.
  • lows near 37 highs 47-54.
  • Mostly cloudy with a (30%) chance of rain Monday, (40%) chance of rain Monday night,
  • Mostly cloudy and a bit warmer with a (40%) chance of rain Tuesday, a slight (20%) chance of rain at night,
  • Mostly cloudy and a bit warmer with a (30%) chance of rain Wednesday, then a (30%) chance of rain Wednesday night and Thursday.
  • highs 54-58 lows 42-44 (seasonal averages high 53 low 37).

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

  • Mostly cloudy with a slight (20%) chance of late evening coastal showers with coastal rain likely (70%) late tonight while a slight (20%) chance of inland evening showers with a good (50%) chance of inland rain late tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with rain likely (70%) Friday (0.25 in. of rain possible), patchy fog with a (30%) chance of showers Friday night,
  • Some AM clouds with patchy fog, mostly sunny and a bit warmer Saturday afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late at night,
  • Mostly cloudy with a (30%) chance of rain and a bit cooler Sunday, then a slight (20%) chance of rain Sunday night.
  • lows 40-38 warming to 43 Sunday night highs 50-57 cooling to 55 Sunday.
  • Mostly cloudy with a (30%) chance of rain Monday, a (40%) chance of rain Monday night,
  • Mostly cloudy and a bit warmer with a (40%) chance of rain Tuesday, a (30%) chance of rain at night,
  • Mostly cloudy and a bit warmer with a (30%) chance of rain Wednesday, a (40%) chance of rain Wednesday night,
  • Then mostly cloudy and a bit cooler with a (40%) chance of rain Thursday.
  • highs near 56-59 cooling to 57 Thursday lows 42-44. (seasonal averages high 54 low 41).

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with a good (50%) chance of evening snow and rain showers, snow showers likely (70%) late tonight (0.25 in. of rain possible, 2 in. of snow possible, snow level 2,500 ft. at night),
  • Mostly cloudy with snow showers likely (70%) and a good (50%) chance of rain showers Friday afternoon (0.25 in. of rain possible, 2 in. of snow possible), a (30%) chance of evening snow and rain showers, just partly cloudy late Friday night,
  • Mostly sunny and a bit warmer Saturday, partly cloudy with a (40%) chance of rain and snow late Saturday night,
  • Mostly cloudy and a bit cooler with a good (50%) chance of rain and snow Sunday, then mostly cloudy with a (40%) chance of rain and snow Sunday night.
  • snow level 2,000 ft. tonight through Friday night, free air freezing level at the surface rising to 5,000 ft. Saturday afternoon,  snow level 3,500 ft. Saturday night, 4,500 ft. Sunday, then 5,000 ft. Sunday night.
  • lows 23-20 warming to 28 Sunday night highs 30-40 cooling to 39 Sunday.
  • Mostly cloudy with a good (50%) chance of rain and snow Monday and Monday night,
  • A mix of clouds and sun with a good (50%) chance of rain and snow Tuesday, partly cloudy with a good (50%) chance of rain and snow at night,
  • A mix of clouds and sun and a bit warmer with a good (50%) chance of rain and snow Wednesday, mostly cloudy with a (40%) chance of rain and snow Wednesday night,
  • Then a mix of clouds and sun with a good (50%) chance of rain and snow Thursday.
  • snow level 4,500 ft. Monday through Tuesday, then 5,000 ft. Tuesday night through Thursday.
  • highs 39-42 lows 26-29.