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June 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

  • NONE AT THIS TIME.

HEALTH ADVISORIES

  • A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER BAR. POOLS IN THE BEDROCK ALONG THE RIVERS EDGE ARE KNOWN TO DEVELOP BLUE-GREEN ALGAE (CYANOBACTERIAL) BLOOMS THAT CAN BE HARMFUL TO PETS AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED ALONG SEVERAL ACCESS AREAS ALONG THE  RIVER.

THE WEATHER PATTERN

An Upper Level High Pressure Ridge (“Arch” shape) is moving closer to the Pacific coast and will warm us up into next week.. The graphics for days 1-3  show a cold front moving over the Pacific Northwest Saturday. The graphics for days 3-7  Sunday through next Thursday show a frontal system moving in Sunday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Mostly clear tonight,
  • Mostly sunny and a bit warmer Friday, mostly clear Friday night,
  • Mostly sunny and a bit warmer Saturday, clear at night,
  • Sunny and a bit warmer Sunday, then clear Sunday night.
  • low 42-50 highs 74-78.
  • Mostly sunny and a bit warmer Monday, clear Monday night.
  • Mostly sunny and a bit warmer Tuesday, mostly clear at night,
  • AM sun, partly cloudy and a bit cooler with a slight (20%) chance of rain Wednesday afternoon and evening, just partly cloudy Wednesday night,
  • Then partly cloudy and a bit cooler with a slight (20%) chance of rain Thursday afternoon.
  • highs 82-87 cooling back to 82 Thursday lows near 52.  (seasonal averages high 71 low 46)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly clear with patchy fog late tonight,
  • Patchy dense AM fog, sunny and a bit warmer Friday afternoon, mostly clear Friday night,
  • Patchy AM fog, sunny and a bit warmer Saturday, mostly clear at night,
  • Mostly sunny and a bit warmer Sunday, then mostly clear Sunday night.
  • lows 45-52 highs 78-80.
  • Mostly sunny and a bit warmer Monday, then mostly clear Monday night,
  • Mostly sunny with a slight (20%) chance of showers and a bit warmer Tuesday afternoon, mostly clear with a slight (20%) chance of evening thunderstorms, just partly cloudy late at night,
  • Partly cloudy and a bit cooler with a slight (20%) chance of thunderstorms Wednesday through Thursday.
  • highs 85-86 cooling to 80 Thursday lows 52-54. (seasonal averages high 73 low 50)

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

  • Mostly clear this evening, partly cloudy with patchy inland fog late tonight,
  • Some AM clouds, sunny and a bit warmer Friday afternoon, mostly clear Friday night with patchy inland fog late,
  • Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear both nights.
  • lows 44-48 cooling to 46 Sunday night highs 63-65.
  • Mostly sunny Monday, mostly clear Monday night,
  • Mostly sunny and a bit warmer Tuesday, mostly clear in the evening, partly cloudy late at night,
  • Partly cloudy and a bit cooler with a slight (20%) chance of thunderstorms Wednesday afternoon and evening, just mostly cloudy Wednesday night,
  • Mostly cloudy start, then partly cloudy with a slight (20%) chance of thunderstorms Thursday afternoon.
  • highs 65-67 cooling back to 65 Wednesday warming to 66 Thursday lows 47-49. (seasonal averages high 62 low 50)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly clear tonight,
  • Mostly sunny and a bit warmer Friday, mostly clear Friday night,
  • Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear both nights.
  • free air freezing level 1o,000 ft. tonight, 10,000 ft. rising to 11,000 ft. Friday afternoon, 12,000 ft. Friday night through Sunday, then 13,000 ft. Sunday night.
  • lows 34-44 highs 64-73.
  • Mostly sunny and a bit warmer Monday, mostly clear with a slight (20%) chance of evening rain, just mostly clear late Monday night,
  • Mostly sunny with a slight (20%) chance of rain Tuesday afternoon, mostly cloudy with a (40%) chance of evening rain, partly cloudy with a slight (20%) chance of rain late at night,
  • Partly cloudy with a slight (20%) chance of AM rain, a bit cooler with a good (50%) chance of rain Wednesday afternoon and evening, partly cloudy with a slight (20%) chance of rain late Wednesday night,
  • Clouds and sun with a slight (20%) chance of AM rain, then a mix of clouds and sun and a bit cooler with a (40%) chance of rain Thursday afternoon.
  • free air freeing level 13,000 ft. Monday, then snow level above 8,000 ft. Monday night through Thursday.
  • highs 77-70 lows near 47.