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May 2, 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 FLOOD WARNING IS IN EFFECT FOR THE IMNAHA RIVER AFFECTING WALLOWA COUNTY.
  • A FLOOD WARNING IS IN EFFECT FOR THE JOHN DAY RIVER AFFECTING WHEELER COUNTY.
  • A FLOOD WARNING IS IN EFFECT FOR THE SILVIES RIVER NEAR BURNS AFFECTING HARNEY COUNTY UNTIL LATE TUESDAY MORNING DUE TO SNOW MELT.
  • A FLOOD WARNING IS IN EFFECT FOR THE SPRAGUE  RIVER NEAR BEATTY AFFECTING KLAMATH COUNTY UNTIL LATE TUESDAY MORNING DUE TO SNOW MELT.

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 High Pressure Ridge continues to move to the east returning the flow of coastal moisture. The graphics for days 1-3  show a low moving southward along the California coast. The graphics for days 3-7  Friday through next Tuesday show a quiet weather pattern until a frontal system slides into the Pacific Northwest Friday and another next Sunday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Clouds and sun with a (40%) chance of AM showers (under 0.10 in. of rain possible), a mix of clouds and sun and a bit warmer this afternoon, partly cloudy tonight,
  • A mix of clouds and sun Wednesday, mostly cloudy with a good (50%) chance of evening showers, a slight (20%) chance of showers late at night,
  • Mostly cloudy and a bit cooler with a good (50%) chance of showers Thursday, mostly cloudy good (50%) chance of showers Thursday night.
  • highs 66-64 lows 44-48.
  • Mostly cloudy and a bit cooler with a good (50%) chance of showers Friday, a (40%) chance of showers Friday night,
  • Mostly cloudy with a good (50%) chance of showers Saturday, evening showers likely (70%), a slight (20%) chance of showers late at night,
  • Mostly cloudy with showers likely (70%) Sunday, a good (50%) chance of showers Sunday night,
  • Mostly cloudy with a good (50%) chance of AM showers, then showers likely (70%) Monday afternoon.
  • highs near 60 lows 47-40. (seasonal averages high 65 low 42)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy and a bit warmer with a (40%) chance of showers today (under 0.10 in. of rain possible), partly cloudy with a slight (20%) chance of evening showers, just mostly cloudy late tonight,
  • Mostly cloudy with a slight (20%) chance of showers Wednesday, a slight (20%) chance of showers at night,
  • Mostly cloudy with a slight (20%) chance of  showers and a bit cooler Thursday, then a slight (20%) chance of showers Thursday night.
  • highs 68-65 lows near 48.
  • Mostly cloudy and a bit cooler with a (30%) chance of showers Friday, a slight (20%) chance of showers Friday night,
  • Mostly cloudy with a (40%) chance of showers Saturday, evening showers likely (70%), a good (50%) chance of showers late at night,
  • Mostly cloudy with showers likely (70%) Sunday, a (40%) chance of showers Sunday night,
  • Mostly cloudy with a good (50%) chance of AM showers, then showers likely (70%) Monday afternoon.
  • highs near 63 lows 48-42. (seasonal averages high 68 low 45)

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

  • Mostly cloudy and a bit warmer with a (30%) chance of showers today (under 0.10 in. of rain possible), just partly cloudy tonight,
  • Mostly cloudy with a slight (20%) chance of coastal showers Wednesday afternoon while a slight (20%) chance of inland showers Wednesday, just mostly cloudy at the shore at night while a slight (20%) chance of evening inland showers and just mostly cloudy inland late Wednesday night,
  • Mostly cloudy with a slight (20%) chance of showers Thursday and Thursday night.
  • highs near 58 lows near 45.
  • Mostly cloudy with a slight (20%) chance of showers Friday and Friday night,
  • Mostly cloudy with a good (50%) chance of showers Saturday and at night,
  • Mostly cloudy with AM showers likely (70%), a good (50%) chance of showers Sunday afternoon, a (40%) chance of showers Sunday night,
  • Mostly cloudy with AM showers likely (70%), then a good (50%) chance of showers Monday afternoon.
  • highs near 58 lows 45-40. (seasonal averages high 59 low 46)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • AM clouds and sun with showers likely (70%), a mix of clouds and sun and a bit warmer with a slight (20%) chance of showers this afternoon, partly cloudy with a (40%) chance of evening showers, just mostly cloudy late tonight,
  • A mix of clouds and sun with a good (50%) chance of showers and a bit warmer Wednesday afternoon, evening showers likely (70%) with a slight (20%) chance of thunderstorms, then a slight (20%) chance of showers and thunderstorms late Wednesday night,
  • Mostly cloudy with a good (50%) chance of AM showers, cooler with showers likely (70%) Thursday afternoon and evening, then a (50%) chance of showers late Thursday night.
  • snow level 8,000 ft. today and tonight, above 8,000 ft. Wednesday, 7,500 ft. Wednesday night and Thursday, then 6,500 ft. Thursday night.
  • highs 55-59 cooling to 50 Thursday lows 37-34.
  • Mostly cloudy with AM snow showers likely (70%), showers likely (70%) and a bit cooler Friday afternoon, a good (50%) chance of evening showers, a slight (20%) chance of rain and snow showers late Friday night,
  • Mostly cloudy with a good (50%) chance of AM rain and  showers, showers likely (70%) and a bit warmer Saturday afternoon, showers likely (70%) at night,
  • Mostly cloudy with AM snow showers, showers and a bit cooler Sunday afternoon,
  • Then mostly cloudy and a bit warmer with rain and snow showers likely (70%) Monday.
  • snow level 7,500 ft. Thursday, 6,500 ft. Thursday night, 5,000 ft. Friday, 5,500 ft. Friday night and Saturday, 6,000 ft. Saturday night, 5,500 ft. Sunday, 5,000 ft. Sunday night, then 4,500 ft. Monday.
  • highs 47-44 warming to 45 Monday lows 33-29.