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May 1, 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 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 THIS 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 the cold front that moved through Oregon. The graphics for days 3-7  Thursday through next Monday 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:

  • A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers today, partly cloudy with a (40%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers and thunderstorms late tonight (under 0.10 in. of rain possible, more in storms),
  • Mostly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit warmer Tuesday afternoon, partly cloudy at night,
  • A mix of clouds and sun and a bit warmer Wednesday, mostly cloudy with a good (50%) chance of evening showers, then a slight (20%) chance of showers late Wednesday night.
  • highs 59-68 lows 45-47.
  • Mostly cloudy with a (40%) chance of AM showers, a bit cooler with a slight (20%) chance of showers Thursday, a good (50%) chance of showers Thursday night,
  • Mostly cloudy and a bit cooler with a good (50%) chance of showers Friday and at night,
  • Mostly cloudy and a bit warmer with a good (50%) chance of showers Saturday, a good (50%) chance of evening showers, partly cloudy with a good (50%) chance of showers late Saturday night,
  • Mostly cloudy with a good (50%) chance of AM showers, then mostly cloudy and a bit cooler with showers likely (70%) Sunday afternoon.
  • highs 63-58 warming to 62 Saturday cooling to 60 Sunday lows 47-44. (seasonal averages high 65 low 42)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy and a bit cooler with a (30%) chance of showers today (AM snow level 3,500 ft.), a (30%) chance of showers tonight (0.10 in. of rain possible),
  • Mostly cloudy and a bit warmer with a (30%) chance of showers Tuesday, a slight (20%) chance of evening showers, partly cloudy late at night,
  • Mostly cloudy and a bit warmer with a slight (20%) chance of showers Wednesday afternoon, then a slight (20%) chance of showers Wednesday night.
  • highs 58-68 lows near 48.
  • Mostly cloudy with a slight (20%) chance of  showers and a bit cooler Thursday, a slight (20%) chance of showers Thursday night,
  • Mostly cloudy and a bit cooler with a (40%) chance of showers Friday, a (30%) chance of showers at night,
  • Mostly cloudy and a bit warmer with a (40%) chance of showers Saturday, a (30%) chance of showers Saturday night,
  • Then mostly cloudy with a good (50%) chance of showers Sunday.
  • highs 67-62 warming to 64 Saturday and Sunday lows 49-45. (seasonal averages high 68 low 45)

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

  • Mostly cloudy with a (30%) chance of showers and a bit cooler today, a slight (20%) chance of coastal showers tonight while a (30%) chance of inland showers tonight (under 0.10 in. of rain),
  • Mostly cloudy and a bit warmer with a (30%) chance of showers Tuesday, just mostly cloudy at night,
  • Mostly cloudy and a bit warmer Wednesday, then a slight (20%) chance of showers Wednesday night.
  • highs 56-59 lows near 44.
  • Mostly cloudy with a slight (20%) chance of showers Thursday, a slight (20%) chance of showers Thursday night,
  • Mostly cloudy and a bit cooler with a (30%) chance of showers Friday, a slight (20%) chance of showers at night,
  • Mostly cloudy and a bit warmer with a (30%) chance of showers Saturday, a (30%) chance of showers Saturday night,
  • Then mostly cloudy and a bit cooler with a good (50%) chance of showers Sunday.
  • highs 59-57 warming back to 59 Saturday cooling back to 57 Sunday lows 45-43. (seasonal averages high 59 low 46)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with AM snow showers likely (70%) and a good (50%) chance of rain showers, a good (50%) chance of showers and a bit cooler this afternoon, mostly cloudy with showers likely (70%) tonight (little or no snow accumulation expected),
  • A mix of clouds and sun and a bit warmer with a good (50%) chance of showers Tuesday, partly cloudy with a (40%) chance of showers at night,
  • Clouds and sun with a slight (20%) chance of AM showers, good (50%) chance of showers with a slight (20%) chance of thunderstorms and a bit warmer Wednesday afternoon, evening showers likely (70%), then a good (50%) chance of showers late Wednesday night.
  • snow level 4,500 ft. today, 5,500 ft. rising to 7,000 ft. late tonight, 8,000 ft. Tuesday, above 8,000 ft. Tuesday night and Wednesday, then 8,000 ft. Wednesday night.
  • highs 42-62 lows 33-39.
  • Mostly cloudy with a good (50%) chance of AM showers, cooler with showers likely (70%) Thursday afternoon and evening, a (50%) chance of showers late Thursday night,
  • Mostly cloudy and a bit cooler with showers likely (70%) Friday and in the evening, a good (50%) chance of rain and snow showers late at night,
  • Mostly cloudy with a good (50%) chance of AM rain and  showers, showers likely (70%) and a bit warmer Saturday afternoon and evening, a good (50%) chance of rain and snow showers late Saturday night,
  • Mostly cloudy with a good (50%) chance of AM rain with snow showers, then showers likely (70%) Sunday afternoon.
  • snow level 8,000 ft. Thursday, 7,500 ft. Thursday night, 6,000 ft. Friday, 5,500 ft. Friday night and Saturday, 6,000 ft. Saturday night, then 5,500 ft. Sunday.
  • highs 52-44 warming to 49 Saturday and Sunday lows 36-34.