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April 4, 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

An Upper Level Low Pressure Trough (“U” shape) continues to send moisture to the Pacific Northwest. The graphics for days 1-3 show a warm front just offshore Wednesday and its associated cold front will be offshore Friday then it will move in. The graphics for days 3-7  Friday through Tuesday show the series of complex frontal systems that will slide into the Pacific Northwest through the period.

Forecast for the South Willamette Valley including Eugene-Springfield:

  • Mostly cloudy with a slight (20%) chance of evening showers and thunderstorms, a slight (20%) chance of rain late tonight (under 0.10 in. of rain possible, small hail possible),
  • Mostly cloudy with a slight (20%) chance of AM rain, rain and a bit warmer Wednesday afternoon (0.10 in,. of rain possible), rain Wednesday night (0.25 in. of rain possible),
  • Mostly cloudy with rain and a bit warmer Thursday (0.10 in. of rain possible), rain at night (0.25 in. of rain possible),
  • Mostly cloudy with AM showers likely (70%), a good (50%) chance of showers and a bit warmer Friday afternoon, then a good (50%) of rain Friday night.
  • lows 34-44 cooling to 42 Friday night highs 52-57.
  • Mostly cloudy with a good (50%) chance of AM rain, rain likely (70%) and a bit cooler Saturday, a good (50%) chance of rain Saturday night,
  • Mostly cloudy and a bit warmer with rain likely (70%) Sunday and in the evening, a (40%) chance of rain at night,
  • Mostly cloudy and a bit cooler with rain likely (70%)  Monday and Monday night,
  • Then mostly cloudy and a bit cooler with rain likely (70%) Tuesday.
  • highs 55-57 cooling to 52 Tuesday lows 46-39. (seasonal averages high 59 low 39)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with a (40%) chance of evening rain showers, snow showers and a slight (20%) chance of thunderstorms, a (40%) chance of rain and snow showers tonight (under 0.10 in. of rain possible, snow level 2,500 ft. falling to 2,000 ft.),
  • Mostly cloudy with a (40%) chance of AM rain and snow showers, a (40%) of showers and a bit warmer Wednesday afternoon (under 0.10 in. of rain possible, snow level 2,000 ft. rising to 3,000 ft. in the afternoon), evening showers, showers likely (70%) late Wednesday night (under 0.10 in. of rain possible),
  • Mostly cloudy with showers and a bit warmer Thursday (under 0.10 in. of rain possible), rain at night (0.25 in. of rain possible),
  • Mostly cloudy with AM showers likely (70%), a good (50%) chance of showers and a bit warmer Friday afternoon, then showers likely (70%) Friday night.
  • lows 34-45 highs 53-59.
  • Mostly cloudy and a bit warmer with a (40%) chance of rain Saturday, a (40%) chance of rain Saturday night,
  • Mostly cloudy and a bit warmer with a rain likely (70%) Sunday, rain likely (70%) at night,
  • Mostly cloudy and a bit warmer with rain likely (70%) Monday and in the evening, a good (50%) chance of rain and colder late Monday night,
  • Then mostly cloudy with rain and snow showers likely (70%) Tuesday.
  • highs 59-62 cooling to 53 Tuesday lows 49-40. (seasonal averages high 61 low 41)

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

  • Mostly cloudy with a (40%) chance of evening showers and a slight (20%) chance of thunderstorms, a (40%) chance of showers late  tonight (under 0.10 in. of rain possible),
  • Cloudy with coastal showers Wednesday and a bit warmer while a good (50%) chance of AM inland showers with inland showers and a bit warmer Wednesday afternoon (0.10 in. of rain possible), showers Wednesday night (0.10 in. of rain possible),
  • Mostly cloudy with rain showers (0.25 in. of rain possible) a bit warmer Thursday and breezy (Coastal Wind: S 20-30 mph while Inland Wind: S 20-30 mph decreasing to S 15-25 mph gusts to 40 mph in the afternoon), rain Thursday night (0.25 in. of rain possible)and breezy (Wind: S 15-25 mph gusts to 40 mph decreasing to 10 mph late at night),
  • Mostly cloudy with AM showers likely (70%), a bit warmer with a good (50%) chance of showers Friday afternoon, then a (40%) chance of rain at night.
  • lows 38-43 highs 52-55.
  • Mostly cloudy with a good (50%) chance of rain and a bit warmer Saturday and breezy, a good (50%) chance of rain and breezy Saturday night,
  • Mostly cloudy and a bit warmer with rain likely (70%) Sunday, rain likely (70%) at night,
  • Mostly cloudy and a bit warmer with rain likely (70%) Monday and Monday night,
  • Then mostly cloudy with showers likely (70%) Tuesday.
  • highs 56-52 lows 45-39. (seasonal averages high 56 low 43)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with a good (50%) chance of evening snow showers, rain with snow likely (70%) late tonight (1 in. of snow possible),
  • Mostly cloudy with a good (50%) chance of snow and rain and a bit warmer Wednesday afternoon (1 in. of snow possible), rain with snow possible late Wednesday night (1 in. of snow possible),
  • Mostly cloudy with AM snow and rain, rain and a bit warmer Thursday afternoon and evening, rain and snow at night,
  • Mostly cloudy with AM rain and snow showers, a bit cooler with snow showers likely (70%) with a good (50%) chance of rain showers Friday afternoon, then a good (50%) chance of rain and snow showers Friday night.
  • snow level 1,500 ft. tonight, 4,000 ft. Wednesday, 4,500 ft. Wednesday night, 5,000 ft. Thursday, 6,000 ft. falling to 5,000 ft. late Thursday night, 4,000 ft. Friday, then 4,500 ft. Friday night.
  • lows 19-32 cooling to 30 Friday night highs 36-42 cooling to 38 Friday.
  • Mostly cloudy with a good (50%) chance of AM snow, a bit warmer with a good (50%) chance of rain Saturday afternoon, evening rain likely (70%), a good (50%) chance of rain late Saturday night,
  • Mostly cloudy with a good (50%) chance of AM rain, rain likely (70%) and a bit warmer Sunday afternoon, rain likely (70%) at night,
  • Mostly cloudy and a bit cooler with rain Monday, rain and snow likely (70%) Monday night,
  • Then mostly cloudy and a bit cooler with rain likely (70%) Tuesday.
  • snow level 5,000 ft. Saturday, 6,000 ft. Saturday night, 6,500 ft. Sunday, 7,000 ft. Sunday night, 6,000 ft. Monday, 4,500 ft. Monday night, then 3,500 ft. Tuesday.
  • highs 42-45 cooling to 35 Friday lows 35-27.