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May 12, 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 HEAT  ADVISORY IS IN EFFECT FROM 2 PM SATURDAY UNTIL 11 PM SUNDAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
  • A HEAT ADVISORY IS IN EFFECT FROM 2 PM SATURDAY UNTIL 8 PM MONDAY 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 NORTHERN OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY.
  • A HEAT ADVISORY IS IN EFFECT FROM NOON SATURDAY UNTIL 11 PM SUNDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
  • A HEAT ADVISORY IS IN EFFECT FROM NOON SATURDAY UNTIL 11 PM SUNDAY FOR CENTRAL DOUGLAS COUNTY , EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS,  JACKSON COUNTY, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES..

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  Monday through next Friday show a quiet weather pattern with a complex frontal system lingering offshore through Thursday and then pushing through Oregon next Friday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Mostly clear tonight,
  • Sunny and a bit warmer Saturday, clear  Saturday night,
  • Sunny and a bit warmer, Hot, Sunday, mostly clear at night,
  • Mostly sunny and a bit cooler Monday, then mostly clear Monday night.
  • lows 52-59 cooling to 55 Monday night highs 87-93 cooling back to 87 Monday.
  • Mostly sunny and a bit cooler Tuesday and Wednesday, mostly clear both nights,
  • Some AM clouds, mostly sunny and a bit cooler Thursday afternoon, partly cloudy Thursday night,
  • Then partly cloudy and a bit cooler Friday.
  • highs 86-77 lows near 54. (seasonal averages high 68 low 44)

Forecast for the Umpqua Valley including Roseburg:

  • Clear tonight,
  • Sunny and a bit warmer Saturday, clear Saturday night,
  • Sunny and a bit warmer Sunday, mostly clear at night,
  • Mostly sunny and a bit cooler Monday, then mostly clear Monday night.
  • lows 55-62 highs 85-97.
  • Mostly sunny and a bit cooler Tuesday and Wednesday, mostly clear both nights,
  • Some AM clouds, sunny and a bit cooler Thursday afternoon, mostly clear in the evening, partly cloudy late Thursday night,
  • Some AM clouds, then sunny Friday afternoon.
  • highs 92-82 lows 58-56. (seasonal averages high 71 low 47)

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

  • Mostly clear tonight,
  • Sunny and warmer Saturday, clear Saturday night,
  • Sunny and warmer Sunday, mostly clear at night,
  • AM clouds, sunny and cooler Monday afternoon, mostly clear in the evening, partly cloudy late Monday night.
  • lows 48-56 cooling to 50 Monday night highs 76-87 cooling to 69 Monday.
  • Partly cloudy and a bit cooler Tuesday, partly cloudy Tuesday night,
  • Partly cloudy and a bit cooler Wednesday through Thursday night,
  • Mostly cloudy start, then partly cloudy Friday afternoon.
  • highs 68-65 lows near 50. (seasonal averages high 60 low 48)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Clear tonight,
  • Sunny and a bit warmer Saturday, clear Saturday night,
  • Mostly sunny and a bit cooler Sunday with a slight (20%) chance of afternoon showers, partly cloudy with a (30%) chance of evening showers, just partly cloudy late at night,
  • Mostly sunny with a slight (20%) chance of AM showers, 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 and a slight (20%) chance of thunderstorms, then just partly cloudy late Monday night.
  • free air freezing level 12,000 ft. rising to 13,000 ft. late tonight, 13,000 ft. rising to 14,000 ft. Saturday afternoon, 14,000 ft. falling to 13,000 ft. late Saturday night, then snow level above 8,000 ft. Sunday through Monday night.
  • lows 45-47 cooling to 44 Monday night highs 72-69 warming to 70 Monday.
  • Mostly sunny and a bit warmer Tuesday and Wednesday, mostly clear both nights,
  • Mostly sunny Thursday, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Thursday night,
  • Some AM clouds, then mostly sunny and a bit cooler with a slight (20%) chance of showers Friday afternoon.
  • free air freezing level 12,000 ft. Tuesday through Wednesday, 13,000 ft. Wednesday night and Thursday, then snow level above 8,000 ft. Thursday night and Friday.
  • highs 74-72 lows 45-47.