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April 21, 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) is sending frontal systems our way and still even more moisture. The graphics for days 1-3 show weak surface high pressure holding the rain chances down lower for the day. A complex frontal system, warm front first followed by a cold front moves in. The graphics for days 3-7  Monday through next Friday show the continuing 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 and a bit warmer with a good (50%) chance of showers today (under 0.10 in. of rain possible), a good (50%) chance of evening showers, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with a slight (20%) chance of showers and a bit warmer Saturday and in the evening (under 0.10 in. of rain possible), a good (50%) chance of showers late at night (under 0.10 in. of rain possible),
  • Then mostly cloudy and a bit cooler with a good (50%) chance of showers Sunday and Sunday night.
  • highs 56-64 cooling to 59 Sunday lows 46-48 cooling to 43 Sunday night.
  • Clouds and sun with a (50%) chance of AM showers, a slight (20%) chance of showers and a bit cooler Monday afternoon, partly cloudy Monday night,
  • Then partly cloudy and a bit warmer Tuesday through Thursday.
  • highs 57-73 lows 42-38 warming to 45 Wednesday night. (seasonal averages high 62 low 43)

Forecast for the Umpqua Valley including Roseburg:

  • Cloudy with a (30%) chance of showers and warmer today (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
  • Mostly cloudy and a bit warmer with a slight (20%) chance of showers Saturday and at night (under 0.10 in. of rain possible),
  • Mostly cloudy and a bit cooler with a slight (20%) chance of showers Sunday, a (30%) chance of showers Sunday night.
  • highs 58-66 cooling to 62 Sunday lows 47-50 cooling to 44 Sunday night.
  • Mostly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit cooler Monday afternoon, partly cloudy Monday night,
  • Partly cloudy and a bit warmer Tuesday and Tuesday night,
  • Partly cloudy and a bit warmer Wednesday, mostly clear Wednesday night,
  • Then mostly sunny and a bit warmer Thursday.
  • highs 59-76 lows 42-47 (seasonal averages high 65 low 43)

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

  • Cloudy with a (30%) chance of showers and a bit warmer today (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with a slight (20%) chance of showers and a bit warmer Saturday and at night (under 0.10 in. of rain possible),
  • Then mostly cloudy and a bit cooler with a slight (20%) chance of showers Sunday and Sunday night.
  • highs 57-62 cooling to 54 Sunday lows near 47-42.
  • Partly cloudy and a bit warmer Monday, partly cloudy Monday night,
  • Then partly cloudy and a bit warmer Tuesday through Thursday.
  • highs 56-65 lows 39-44. (seasonal averages high 57 low 45)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with AM rain and snow showers likely (70%), a good (50%) chance of  showers and a bit warmer this afternoon (0.25 in. of rain possible, 1 in. of snow possible), a good (50%) chance of showers tonight,
  • A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Saturday, becoming mostly cloudy with a good (50%) chance of showers at night,
  • Mostly cloudy and a bit cooler with a good (50%) chance of showers Sunday, then rain and snow showers likely (70%) Sunday night.
  • snow level 5,500 ft. today, 6,500 ft. tonight and Saturday, 7,000 ft. Saturday night, 6,000 ft. Sunday, then 4,500 ft. Sunday night.
  • highs 42-48 cooling to 46 Sunday lows 33-36 cooling to 29 Sunday night.
  • A mix of clouds and sun with a good (50%) chance of snow and rain showers and a bit cooler Monday, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Monday night,
  • Partly cloudy and a bit warmer Tuesday, partly cloudy at night,
  • Mostly sunny and a bit warmer Wednesday, partly cloudy Wednesday night,
  • Some AM clouds, then mostly sunny and a bit warmer Thursday afternoon.
  • snow level  4,000 ft. Monday, 4,500 ft. Monday night, free air freezing level 9,000 ft. Tuesday, 11,000 ft. Tuesday night and Wednesday, then 12,000 ft. Thursday.
  • highs 39-62 lows  27-36.