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May 10, 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   THURSDAY MORNING DUE TO RAIN AND 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 Low  (“U” shape) is moving eastward and will weaken the moisture flow to the Pacific Northwest to be replaced by a High Pressure Ridge (“Arch” shape). The graphics for days 1-3  show the frontal system, show no frontal systems approaching the Pacific Northwest. The graphics for days 3-7  Saturday through next Wednesday show a quiet weather pattern with a frontal system lingering offshore next Wednesday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Partly cloudy, a slight (20%) chance of evening thunderstorms, just partly cloudy late tonight,
  • Some AM clouds, sunny and a bit warmer Thursday, partly cloudy Thursday night,
  • Mostly sunny and a bit warmer Friday, mostly clear at night,
  • Sunny and a bit warmer Saturday, then clear Saturday night.
  • lows 46-57 highs 73-87.
  • Sunny and a bit warmer, Hot, Sunday, mostly clear Sunday night,
  • Mostly sunny start, partly cloudy and a bit cooler Monday with a slight (20%) chance of afternoon showers, partly cloudy at night,
  • Mostly sunny and a bit cooler Tuesday, mostly clear Tuesday night,
  • Some AM clouds, then mostly sunny and a bit cooler Wednesday afternoon.
  • highs 93-82 lows 59-54. (seasonal averages high 67 low 43)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with a (30%) chance of evening showers and a slight (20%) chance of thunderstorms, a (30%) chance of rain with patchy fog late tonight,
  • Some AM clouds with patchy fog, sunny and a bit warmer Thursday afternoon, partly cloudy Thursday night,
  • Mostly sunny and a bit warmer Friday, mostly clear at night,
  • Sunny and warmer Saturday, then clear Saturday night.
  • lows 48-60 highs 76-92.
  • Sunny and a bit warmer Sunday, mostly clear Sunday night,
  • AM sun, partly cloudy and a bit cooler with a slight (20%) chance of of thunderstorms Monday afternoon, a slight (20%) chance of evening thunderstorms, mostly clear at night,
  • Mostly sunny and a bit cooler Tuesday and Wednesday, mostly clear Tuesday night,
  • highs 97-84 lows 62-57. (seasonal averages high 70 low 47)

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

  • Mostly cloudy with patchy fog late tonight,
  • Mostly cloudy start, sunny and a bit warmer Thursday afternoon, mostly cloudy Thursday night,
  • Some AM clouds, sunny and a bit warmer Friday, mostly clear at night,
  • Sunny and warmer Saturday, then clear Saturday night.
  • lows 46-44 warming to 56 Saturday night highs 63-80.
  • Sunny and warmer Sunday, mostly clear Sunday night,
  • Mostly sunny and cooler Monday, partly cloudy and a bit cooler at night,
  • Partly cloudy and a bit cooler Tuesday, partly cloudy Tuesday night,
  • Then partly cloudy Wednesday.
  • highs 87-66 lows 55-49. (seasonal averages high 60 low 47)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with a good (50%) chance of evening showers and thunderstorms (0.10 in. of rain possible, more in storms), just partly cloudy late tonight,
  • Partly cloudy and a bit warmer Thursday, partly cloudy Thursday night,
  • Mostly sunny and a bit warmer Friday, mostly clear at night,
  • Sunny and a bit warmer Saturday, then clear Saturday night.
  • snow level 7,500 ft. tonight, free air freezing level 8,000 fr. rising to 9,000 ft. Thursday afternoon, 10,000 ft. Thursday night, 11,000 ft. Friday, 12,000 ft. Friday night, 13,000 ft. Saturday, then 14,000 ft. Saturday night.
  • lows 36-47 highs 60-72.
  • Sunny Sunday, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Sunday night,
  • AM sun, a mix of clouds and sun with a (40%) chance of showers and a slight (20%) chance of thunderstorms Monday afternoon, partly cloudy with a (40%) chance of evening showers, just partly cloudy at night,
  • Mostly sunny and a bit warmer with a slight (20%) chance of showers Tuesday afternoon,  just partly cloudy late Tuesday night,
  • Mostly sunny start, then partly cloudy and a bit warmer with a slight (20%) chance of showers Wednesday afternoon.
  • free air freezing level  14,000 ft. Sunday, then snow level above 8,000 ft. Sunday night through Tuesday night.
  • highs 72-70 warming back to 72 Tuesday and Wednesday lows 47-45.