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May 26, 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 PUBLIC HEALTH ADVISORY IS IN EFFECT DUE TO UNSAFE LEVELS OF FECAL BACTERIA IN OCEAN WATERS AT NYE BEACH IN LINCOLN COUNTY. PEOPLE SHOULD AVOID DIRECT CONTACT WITH THE WATER IN THIS AREA UNTIL THE ADVISORY IS LIFTED. UNSAFE LEVELS OF FECAL BACTERIA CAN CAUSE DIARRHEA, STOMACH CRAMPS, SKIN RASHES, UPPER RESPIRATORY INFECTIONS, AND OTHER ILLNESSES. CHILDREN, THE ELDERLY, AND THOSE WITH COMPROMISED IMMUNE SYSTEM SHOULD USE EXTRA CAUTION AS THEY ARE MORE VULNERABLE TO ILLNESS FROM WATERBORNE BACTERIA. VISITORS SHOULD AVOID WADING IN NEARBY  CREEKS, POOLS OF WATER ON THE BEACH, OR IN DISCOLORED WATER, AND STAY CLEAR OF WATER RUNOFF FLOWING INTO THE OCEAN.
  • 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 Low Pressure Trough (“U” shape) is moving eastward and an Upper Level High Pressure Ridge is well offshore slowly heading toward the coast.  The graphics for days 1-3  show a weak surface wave moving over the Pacific Northwest Saturday bringing cooler air with it. The graphics for days 3-7  Monday through next Friday show a frontal system moving in between Monday and Tuesday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Becoming mostly cloudy late tonight,
  • A mix of clouds and sun and cooler Saturday, partly cloudy Saturday night,
  • Mostly sunny and a bit warmer Sunday, mostly clear at night,
  • Sunny and a bit warmer Monday (Memorial Day), then clear Monday night.
  • lows 52-46 highs 73-78.
  • Mostly sunny and a bit cooler Tuesday, mostly clear Tuesday night,
  • AM sun, partly cloudy and a bit cooler Wednesday afternoon, partly cloudy at night,
  • Mostly sunny  Thursday, mostly clear Thursday night,
  • Then mostly sunny and a bit cooler Friday.
  • highs 73-70 lows near 43-45.  (seasonal averages high 70 low 45)

Forecast for the Umpqua Valley including Roseburg:

  • Becoming mostly cloudy with patchy fog late tonight,
  • AM clouds with patchy fog, mostly cloudy and cooler with a slight (20%) chance of showers Saturday afternoon, partly cloudy with patchy fog late Saturday night,
  • AM clouds, sunny and a bit warmer Sunday afternoon, mostly clear at night,
  • Sunny and a bit warmer Monday (Memorial Day), then mostly clear Monday night.
  • lows 53-50 highs 73-82.
  • Some AM clouds, sunny and a bit cooler Tuesday, mostly clear Tuesday night,
  • Partly cloudy and a bit cooler Wednesday and at night,
  • Partly cloudy Thursday, mostly clear Thursday night,
  • Some AM clouds, then sunny and a bit warmer Friday afternoon.
  • highs 77-73 warming to 75 Friday lows near 47. (seasonal averages high 73 low 50)

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

  • Mostly cloudy with patchy evening coastal fog and areas of coastal fog late tonight with a slight (20%) chance of drizzle late while patchy inland evening fog with areas of inland fog late tonight,
  • Mostly cloudy with patchy AM fog and a slight (20%) chance of inland drizzle, just mostly cloudy and a bit warmer at the shore Saturday afternoon while mostly cloudy with a slight (20%) chance of inland drizzle and a bit warmer Saturday afternoon, partly cloudy in the evening, mostly cloudy with patchy fog late Saturday night,
  • AM clouds, sunny and a bit warmer Sunday afternoon, mostly clear in the evening, mostly cloudy late at night,
  • Partly cloudy and a bit warmer Monday (Memorial Day), then partly cloudy Monday night.
  • lows 52-46 highs 62-65.
  • Partly cloudy and a bit cooler Tuesday, mostly clear in the evening, partly cloudy late Tuesday night,
  • Then partly cloudy Wednesday through Friday.
  • highs near 62 lows near 45. (seasonal averages high 62 low 49)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Partly cloudy with a slight (20%) chance of evening showers and thunderstorms, just mostly cloudy late tonight,
  • Mostly cloudy with a (40%) chance of showers and a bit cooler Saturday with a slight (20%) chance of afternoon thunderstorms, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Saturday night,
  • Some AM clouds, mostly sunny and a bit warmer with a slight (20%) chance of showers Sunday afternoon, mostly clear at night,
  • Mostly sunny and a bit warmer Monday (Memorial Day), then mostly  clear Monday night.
  • snow level above 8,000 ft. tonight through Sunday, then free air freezing level 12,000 ft. Sunday night through Monday night.
  • lows 42-38 warming back to 42 Sunday night highs 66-62 warming to 65 Sunday.
  • Mostly sunny and a bit cooler Tuesday with a slight (20%) chance of afternoon showers, mostly clear Tuesday night,
  • Mostly sunny and a bit cooler with a slight (20%) chance of showers Wednesday afternoon, 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 Thursday afternoon, a slight (20%) chance of evening showers, just partly cloudy late Thursday night,
  • AM sun, then partly cloudy with a slight (20%) chance of showers Friday afternoon.
  • snow level above 8,000 ft. Tuesday, free air freezing level 11,000 ft. Tuesday night, snow level 7,500 ft. Wednesday and Wednesday night, above 8,000 ft. Thursday and Thursday night, then 8,000 ft. Friday.
  • highs 68-62 lows 42-40.