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April 15, 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 ADVISORY IS IN EFFECT DUE TO SNOW MELT UNTIL 3 PM MONDAY FOR HARNEY COUNTY.

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 (“Arch” shape) is moving in to clear skies and keep us dry for  bit. The graphics for days 1-3 show the cold front that moved through the Pacific Northwest and the next one behind it.  The graphics for days 3-7  Tuesday through Saturday 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 cooler today, mostly cloudy tonight,
  • Mostly cloudy with a (40%) chance of AM rain, rain and a bit cooler Sunday afternoon, (0.10 in. of rain possible) evening rain likely (70%), a good (50%) chance of rain late at night (under 0.10 in. of rain possible),
  • Mostly cloudy and cooler with rain Monday, then rain Monday night.
  • highs 58-49 lows 42-36.
  • Mostly cloudy with showers Tuesday with a slight (20%) chance of afternoon thunderstorms, evening showers likely (70%) with a good (50%) chance of showers late Tuesday night,
  • Mostly cloudy with a good (50%) chance of AM showers, showers likely (70%) and a bit warmer Wednesday afternoon, a good (50%) chance of showers at night,
  • A mix of clouds and sun and a bit warmer with a good (50%) chance of showers Thursday, partly cloudy with a (40%) chance of evening showers, a slight (20%) chance of showers late Thursday night,
  • Clouds and sun with a slight (20%) chance of AM showers, then a (30%) chance of showers and a bit warmer Friday afternoon.
  • highs 49-59  lows near 36. (seasonal averages high 61 low 40)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy and a bit cooler today, mostly cloudy tonight,
  • Mostly cloudy with a (30%) chance of AM showers, showers with a slight (20%) chance of thunderstorms and a bit cooler Sunday afternoon (0.10 in. of rain possible, snow level 3,500 ft.), evening showers likely (70%) with a slight (20%) chance of thunderstorms, then a good (50%) chance of rain and snow showers late Sunday night (under 0.10 in. of rain possible, snow level 2,500 ft. falling to 2,000 ft. late at night),
  • Mostly cloudy with AM rain and snow showers likely (70%), showers with a slight (20%) chance of thunderstorms and a bit cooler Monday afternoon, evening rain and snow showers, then rain and snow showers likely (70%) late Monday night.
  • highs 62-52 lows 42-37.
  • Mostly cloudy with AM rain and snow showers, rain showers, snow showers and 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 Tuesday night,
  • Mostly cloudy with a good (50%) chance of AM rain and snow showers, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit warmer Wednesday afternoon, a (40%) chance of rain and snow showers at night,
  • Mostly cloudy and a bit warmer with a (40%) chance of rain and snow, a (30%) chance of evening showers, partly cloudy with a slight (20%) chance of showers  Thursday night with widespread frost late,
  • Mostly cloudy with a slight (20%) chance of AM showers, then partly cloudy and a bit warmer with a slight (20%) chance of showers Friday afternoon.
  • highs 49-59 lows near 36. (seasonal averages high 63 low 42)

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

  • Mostly cloudy and a bit warmer today, mostly cloudy tonight,
  • Mostly cloudy with AM showers likely (70%), coastal showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Sunday afternoon while inland showers and a slight (20%) chance of thunderstorms Sunday afternoon (0.25 in. of rain possible) , a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, a good (50%) chance of showers late at night (under 0.10 in. of rain possible, snow level 2,000 ft.),
  • Mostly cloudy with AM showers, showers and a bit cooler Monday with a slight (20%) chance of thunderstorms, evening showers, then rain and snow showers late Monday night.
  • highs 56-52 lows 42-36.
  • Mostly cloudy with AM rain and snow showers, showers likely (70%) and a bit cooler with a slight (20%) chance of thunderstorms Tuesday afternoon, a good (50%) chance of evening showers, rain and snow showers likely (70%) late Tuesday night,
  • Mostly cloudy with a good (50%) chance of AM rain and snow showers, a bit warmer with a good (50%) chance of showers and s slight (20%) chance of thunderstorms Wednesday afternoon, a (40%) chance of showers at night,
  • Mostly cloudy and a bit warmer with a (50%) chance of showers Thursday, a slight (20%) chance of showers Thursday 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 Friday afternoon.
  • highs 50-57 lows near 37. (seasonal averages high 57 low 44)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • A mix of clouds and sun and a bit cooler today, mostly cloudy tonight,
  • Mostly cloudy with a (20%) chance of AM rain and snow, rain and snow and a bit cooler Sunday afternoon, snow and rain at night,
  • Mostly cloudy with AM snow likely (70%), snow and rain and colder Monday afternoon, then snow Monday night.
  • free air freezing level 5,500 ft. rising to 7,000 ft. this afternoon, 7,500 ft. falling to 7000 ft. late tonight, snow level 4,500 ft. Sunday, 4,000 ft. falling to  3,000 ft. late Sunday night, 3,000 ft. Monday, then 2,000 ft. Monday night.
  • highs 47-35 lows 32-20.
  • Mostly cloudy with snow snow showers and a bit cooler Tuesday with a slight (20%) chance of afternoon thunderstorms, evening snow showers  likely (70%), a good (50%) chance of snow late Tuesday night,
  • Mostly cloudy with a good (50%) chance of AM snow showers, snow showers likely (70%) and a bit warmer Wednesday afternoon, a good (50%) chance of snow showers at night,
  • Clouds and sun with a good (50%) chance of AM snow showers, a good (50%) chance of showers and a bit warmer Thursday afternoon, partly cloudy with a (40%) chance of evening rain and snow showers, a slight (20%) chance of rain and snow showers late Thursday night,
  • Clouds and sun with a (30%) chance of AM rain showers and snow showers, then a (30%) chance of showers and a bit warmer Friday afternoon.
  • snow level 2,000 ft. Tuesday and Tuesday night, 2,500 ft. Wednesday and Wednesday night, 3,500 ft. Thursday, 4,000 ft. Thursday night, then 4,500 ft. Friday.
  • highs 32-42 lows near 23.