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May 11, 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

  • AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM SATURDAY AFTERNOON THROUGH MONDAY EVENING FOR THE NORTH OREGON COAST, THE CENTRAL OREGON COAST, THE COAST RANGE OF NORTHWESTERN OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE NORTH OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY, THE UPPER HOOD RIVER VALLEY, THE WESTERN COLUMBIA RIVER GORGE, AND THE CENTRAL COLUMBIA GORGE.
  • A FLOOD WARNING IS IN EFFECT FOR THE SILVIES RIVER NEAR BURNS AFFECTING HARNEY  COUNTY UNTIL   THIS 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 High Pressure Ridge(“Arch” shape) takes over bringing a heat wave.. The graphics for days 1-3  show system, show no frontal systems approaching the Pacific Northwest. The graphics for days 3-7  Sunday through next Thursday show a quiet weather pattern with a complex frontal system lingering offshore next Thursday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Some AM clouds, sunny and a bit warmer this afternoon, partly cloudy tonight,
  • Mostly sunny and a bit warmer Friday, mostly clear at night,
  • Sunny and a bit warmer Saturday, then clear Saturday night.
  • highs 75-87 lows 47-57.
  • 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:

  • Some AM clouds with patchy fog, sunny and a bit warmer this afternoon, partly cloudy tonight,
  • Mostly sunny and a bit warmer Friday, mostly clear at night,
  • Sunny and warmer Saturday, then clear Saturday night.
  • highs 76-92 lows 50-60.
  • 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 start, sunny and a bit warmer this afternoon, mostly cloudy tonight,
  • Some AM clouds, sunny and a bit warmer Friday, mostly clear at night,
  • Sunny and warmer Saturday, then clear Saturday night.
  • highs 63-80 lows 44-56.
  • 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:

  • Partly cloudy and a bit warmer today, partly cloudy tonight,
  • Mostly sunny and a bit warmer Friday, mostly clear at night,
  • Sunny and a bit warmer Saturday, then clear Saturday night.
  • free air freezing level 8,000 fr. rising to 9,000 ft. this afternoon, 10,000 ft. tonight, 11,000 ft. Friday, 12,000 ft. Friday night, 13,000 ft. Saturday, then 14,000 ft. Saturday night.
  • highs 60-72 lows 40-47.
  • 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.