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April 7, 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

  • A WIND ADVISORY IS IN EFFECT UNTIL 8 AM TODAY FOR THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON.

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

Another  Upper Level Low Pressure Trough (“U” shape) is offshore sending more moisture to the Pacific Northwest. The graphics for days 1-3 show the cold front on its way to us. The graphics for days 3-7  Monday through Friday 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 good (50%) chance of AM rain and a slight (20%) chance of thunderstorms, a slight (20%) chance of showers and thunderstorms and a bit cooler this afternoon (under 0.10 in. of rain possible, more in storms), partly cloudy this evening, mostly cloudy late tonight,
  • Mostly cloudy with a slight (20%) chance of showers and a bit warmer Saturday afternoon, a slight (20%) chance of evening showers, rain likely (70%) late at night,
  • Mostly cloudy with a good (50%) chance of AM rain, a bit warmer with rain likely (70%) Sunday afternoon (Easter), then rain Sunday night.
  • highs 56-62 lows 38-48.
  • Mostly cloudy and a bit cooler with rain Monday and in the evening, showers likely (70%) late Monday night,
  • Mostly cloudy with AM showers likely (70%), showers with a slight (20%) chance of thunderstorms and a bit cooler with Tuesday, evening showers likely (70%), a good (50%) chance of rain and snow showers late at night,
  • Mostly cloudy with a (30%) chance of AM snow showers, a mix of clouds and sun and a bit warmer with a good (50%) chance of showers Wednesday afternoon, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Wednesday night,
  • Then partly cloudy and a bit warmer with a slight (20%) chance of showers Thursday.
  • highs 55-49 warming to 54 Wednesday lows 39-34. (seasonal averages high 59 low 39)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with AM rain likely (70%) and a slight (20%) chance of thunderstorms, a slight (20%) chance of rain and thunderstorms and a bit cooler this afternoon (under 0.10 in. of rain possible, snow level 3,500 ft.), just moistly cloudy tonight (under 0.10 in. of rain possible),
  • Mostly cloudy and a bit warmer Saturday, mostly cloudy with a slight (20%) chance of showers late Saturday night
  • Mostly cloudy with a (30%) chance of showers and a bit warmer Sunday (Easter), a good (50%) chance of evening rain, then rain likely (70%) Sunday night.
  • highs 57-68 lows 40-49.
  • Mostly cloudy with  rain and a bit cooler Monday, evening showers likely (70%), a good (50%) chance of showers and colder late Monday night,
  • Mostly cloudy with AM rain and snow showers likely (70%), showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Tuesday afternoon, evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers late at night,
  • Mostly cloudy and a bit cooler with a (40%) of rain and snow showers Wednesday, a slight (20%) chance of evening rain and snow showers, then just partly cloudy late Wednesday night,
  • Mostly cloudy with a slight (20%) chance of AM rain and snow showers, then partly cloudy and a bit warmer with a slight (20%) chance of showers Thursday afternoon.
  • highs 59-50 warming to 56 Thursday lows 40-35. (seasonal averages high 61 low 41)

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

  • Mostly cloudy with a good (50%) chance of AM coastal rain while inland AM rain likely (70%) and a slight (20%) chance of inland rain this afternoon (under 0.10 in. of rain possible),  just mostly cloudy tonight,
  • Mostly cloudy and a bit warmer Saturday, a slight (20%) chance of shower at night,
  • Mostly cloudy with a good (50%) chance of AM showers, showers likely (70%) and a bit warmer Sunday afternoon (Easter), then rain likely (70%) Sunday night.
  • highs 56-44 warming to 57 Saturday lows 42-40 warming to 46 Saturday night.
  • Mostly cloudy with AM rain, rain likely (70%)  and a bit cooler Monday afternoon, showers likely (70%) and colder late Monday night,
  • Mostly cloudy and a bit cooler with showers likely (70%) Tuesday and in the evening, rain and snow showers late at night,
  • Mostly cloudy with a good (50%) chance of AM rain and snow showers, a (40%) chance of showers and a bit cooler Wednesday afternoon, partly cloudy with a slight (20%) chance of showers Wednesday night,
  • Then partly cloudy and a bit warmer with a slight (20%) chance of showers Thursday.
  • highs 58-50 lows 42-35. (seasonal averages high 56 low 43)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with AM rain and snow, a bit cooler with a good (50%) chance of rain showers and snow showers a slight (20%) chance of thunderstorms this afternoon (0.25 in. of rain, 2 in. of snow possible), a slight (20%) chance of evening rain and snow showers and a slight (20%) chance of thunderstorms (small hail possible), becoming partly cloudy late tonight,
  • Mostly cloudy and a bit warmer Saturday, becoming mostly cloudy with evening rain, partly cloudy with a slight (20%) chance of rain late at night,
  • A mix of clouds and sun with a good (50%) chance of rain and a bit warmer Sunday (Easter) and in the evening, then rain likely (70%) late Sunday night.
  • snow level 6,500 ft. falling to 5,500 ft. late tonight, 4,400 ft. Friday, 3,500 ft. Friday night, free air freezing level 5,000 ft. rising to 6,500 ft. Saturday, snow level 6,000 ft. Saturday night, then above 8,000 ft. Sunday and Sunday night.
  • highs 39-53 lows 32-27 warming to 36 Sunday night.
  • Mostly cloudy and a bit cooler with rain Monday, evening snow and rain showers, a good (50%) chance of snow and rain showers late Monday night,
  • Mostly cloudy with AM snow showers likely (70%), snow and rain showers and cooler Tuesday afternoon, snow showers at night,
  • Mostly cloudy and a bit cooler with snow showers likely (70%) Wednesday, a good (50%) chance of evening snow showers, partly cloudy with a slight (20%) chance of snow showers late Wednesday night,
  • Clouds and sun with a slight (20%) chance of AM snow showers, then a mix of clouds and sun with a (40%) of rain and snow showers and a bit warmer Thursday afternoon.
  • snow level  6,500 ft. Monday, 3,500 ft. Monday night, 2,500 ft. Tuesday, 2,000 ft. Tuesday night, 1,500 ft. Wednesday, 2,000 ft. Wednesday night, then 2,500 ft. Thursday.
  • highs 46-33 warming to 38 Thursday lows 24-20.