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April 19, 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 FREEZE WARNING IS IN EFFECT FROM 2 AM UNTIL 9 AM THURSDAY 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

An Upper Level Low Pressure Trough (“U” shape) is moving eastward and will push more frontal systems our way. The graphics for days 1-3 show a warm front just offshore Thursday. The graphics for days 3-7  Saturday through next Wednesday 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:

  • Partly cloudy with a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, mostly cloudy with a good (50%) chance of rain tonight with areas of frost late (under 0.10 in. of rain possible, more in storms),
  • Mostly cloudy with rain Thursday (0.25 in. of rain possible), evening rain, showers likely (70%) late Thursday night (0.25 in. of rain possible),
  • Cloudy and a bit warmer with a good (50%) chance of showers Friday (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers at night (under 0.10 in. of rain possible),
  • Mostly cloudy with a slight (20%) chance of showers and a bit warmer Saturday, then a good (50%) chance of showers late Saturday night.
  • lows 36-49 highs 52-66.
  • Mostly cloudy and a bit cooler with a good (50%) chance of showers Sunday, a good (50%) chance of showers Sunday night,
  • Clouds and sun with a (40%) chance of AM showers, a slight (20%) chance of showers and a bit warmer Monday afternoon, partly cloudy with patchy frost late at night,
  • Partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday afternoon, a slight (20%) chance of showers Tuesday night,
  • Then partly cloudy and a bit warmer Wednesday.
  • highs 57-65 lows 42-37 warming to 37 Tuesday night. (seasonal averages high 62 low 40)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with a (40%) chance of evening showers and a slight (20%) of thunderstorms, a (40%) chance of rain and snow showers late this evening and tonight (under 0.10 in. of rain possible, evening snow level 2,500 ft.),
  • Cloudy with a good (50%) chance of AM rain and showers, showers and slightly cooler Thursday afternoon (under 0.10 in. of rain possible, snow level 2,000 ft. rising to 2,500 ft. in the afternoon), showers likely (70%) Thursday night (under 0.10 in. of rain possible),
  • Cloudy with a (30%) chance of showers and a bit warmer Friday (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of evening showers just mostly cloudy late Friday night,
  • Mostly cloudy and a bit warmer Saturday, then mostly cloudy with a slight (20%) chance of showers Saturday night.
  • lows 36-46 highs 52-67.
  • Mostly cloudy and a bit cooler with a slight (20%) chance of showers Sunday and Sunday night,
  • Mostly cloudy with a slight (20%) chance of AM showers, just mostly cloudy and a bit cooler Monday afternoon, partly cloudy Monday night,
  • Then partly cloudy and a bit warmer Tuesday through Wednesday.
  • highs 60-58 warming to 72 Wednesday lows 44-40 warming to 42 Tuesday night. (seasonal averages high 64 low 43)

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

  • Mostly cloudy evening coastal showers and a slight (20%) chance of thunderstorms and slight (20%) chance of coastal showers tonight while a (30%) chance of evening inland showers and a slight (20%) chance of thunderstorms with a (30%) chance of inland showers tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with AM showers likely (70%), showers and a bit warmer Thursday afternoon (under 0.10 in. of rain possible),   coastal showers likely (70%) Thursday night while inland evening showers likely (70%) and a (40%) chance of inland showers late Thursday night (0.10 in. of rain possible),
  • Cloudy with a (30%) chance of showers and a bit warmer Friday, mostly cloudy with a slight (20%) chance of evening inland showers while a slight (20%) chance of coastal showers at night,
  • Mostly cloudy with a slight (20%) chance of AM showers, just mostly cloudy and a bit warmer Saturday afternoon, then a slight (20%) chance of showers Saturday night.
  • lows near 38-46 highs 54-62.
  • Mostly cloudy and a bit cooler with a slight (20%) chance of showers Sunday, a slight (20%) chance of showers Sunday night,
  • Partly cloudy with a slight (20%) chance of AM showers, partly cloudy Monday afternoon, partly cloudy Monday night,
  • Then partly cloudy and a bit warmer Tuesday through Wednesday.
  • highs 55-58 lows 42-38 warming to 40 Tuesday night. (seasonal averages high 57 low 44)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with a good (50%) chance of evening snow showers and a slight (20%) chance of thunderstorms, a slight (20%) chance of snow late tonight (0.10 in. of rain possible, 2 in. of snow possible),
  • Mostly cloudy with AM snow, rain Thursday afternoon (0.25 in. of rain possible, 2 in. of snow possible), evening rain and snow, rain and snow showers late Thursday night (0.50 in. of rain possible, 1-4 in. of snow possible),
  • Mostly cloudy with AM rain and snow showers likely (70%), a good (50%) chance of  showers and a bit warmer Friday afternoon, a (40%) chance of evening showers, a slight (20%) chance of showers late at night,
  • A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Saturday, then becoming mostly cloudy with a good (50%) chance of showers Saturday night.
  • snow level 2,000 ft. tonight, 2,000 ft. rising to 4,000 ft. Thursday afternoon, 5,000 ft. Thursday night, 5,500 ft. Friday, 6,000 ft. Friday night, then 7,000 ft. Saturday and  Saturday night.
  • lows 19-35 highs 37-50.
  • Mostly cloudy and a bit cooler with a good (50%) chance of showers Sunday, a good (50%) chance of rain and snow showers Sunday night,
  • A mix of clouds and sun with a (40%) chance of rain and snow showers and a bit cooler Monday, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late at night,
  • Partly cloudy with a slight (20%) chance of showers and a bit warmer Tuesday afternoon, a slight (20%) chance of showers and snow showers Tuesday night,
  • Mostly cloudy with a slight (20%) chance of AM showers, then partly cloudy and a bit warmer with a slight (20%) chance of showers Wednesday afternoon.
  • snow level  6,000 ft. Sunday, 4,500 ft. Sunday night, 4,000 ft. Monday, 4,500 ft. Monday night, 5,000 ft. Tuesday, then 5,500 ft. Tuesday night and Wednesday.
  • highs 45-43 warming to 55 Wednesday lows  29-32.