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October 30, 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 RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR LAKE  EWAUNA IN KLAMATH COUNTY DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE LAKE AND SLOUGH WHERE BLOOMS ARE, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER, THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. THE OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE AREA AND ENJOY ACTIVITIES SUCH AS FISHING, CAMPING, HIKING, BILKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY. SPRAYS COULD LEAD TO THE RISK OF INHALING CYANOTOXINS.DO NOT DRINK THE WATER.
  • A RECREATIONAL USE HEALTH ADVISORY HAS BEEN EXPANDED FOR THE AREA FROM THE ROSS ISLAND LAGOON TO RIVERPLACE MARINA IN MULTNOMAH COUNTY DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE LAKE AND SLOUGH WHERE BLOOMS ARE, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER, THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. THE OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE AREA AND ENJOY ACTIVITIES SUCH AS CATCH AND RELEASE FISHING, CAMPING, HIKING, BILKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY. SPRAYS COULD LEAD TO THE RISK OF INHALING CYANOTOXINS. DRINKING WATER FROM THE LAKE IS ESPECIALLY DANGEROUS.
  • A RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR THE WILLAMETTE RIVER FROM ROSS ISLAND DOWNSTREAM (NORTH) TO THE AREA NEAR CATHEDRAL PARK IN PORTLAND, IN MULTNOMAH COUNTY DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE LAKE AND SLOUGH WHERE BLOOMS ARE, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER, THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. THE OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE AREA AND ENJOY ACTIVITIES SUCH AS FISHING, CAMPING, HIKING, BILKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY. SPRAYS COULD LEAD TO THE RISK OF INHALING CYANOTOXINS.DO NOT DRINK THE WATER.
  • A RECREATIONAL USE HEALTH ADVISORY ICONTINUES IN EFFECT FOR ARRONS LAKE, BUT HAS BEEN LIFTED FOR PETE’S SLOUGH AND STURGEON LAKE ON SAUVIE ISLAND DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE LAKE AND SLOUGH WHERE BLOOMS ARE, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER, THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. THE OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE AREA AND ENJOY ACTIVITIES SUCH AS FISHING, CAMPING, HIKING, BILKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY. SPRAYS COULD LEAD TO THE RISK OF INHALING CYANOTOXINS.
  • A RECREATIONAL USE HEALTH ADVISORY IS IN EFFECT FOR AGENCY LAKE AND EXTENDED THE ADVISORY FOR THE SOUTHERN PORTION OF UPPER KLAMATH LAKE, FROM HOWARD’S BAY SOUTH TO THE LINK RIVER DAM  IN KLAMATH COUNTY DUE TO THE PRESENCE OF A CYANOBACTERIA BLOOM. PEOPLE SHOULD AVOID SWIMMING AND HIGH SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE RESERVOIR WHERE BLOOMS ARE, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER, THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. THE OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT AND ENJOY ACTIVITIES SUCH AS FISHING, CAMPING, HIKING, BILKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY. SPRAYS COULD LEAD TO THE RISK OF INHALING CYANOTOXINS.
  • 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

Upper Level High Pressure takes over. The graphics for days 1-3  show the no frontal systems moving through or approaching the Pacific Northwest. The graphics for days 3-7   Thursday through Monday show a complex frontal system approaching the Pacific Northwest Thursday and pushing through. Another complex frontal system will be offshore Saturday then moving in next Sunday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Partly cloudy with areas of frost late tonight,
  • Mostly cloudy and a bit warmer Tuesday, mostly cloudy with a slight (20%) chance of rain late Tuesday night,
  • Cloudy with a slight (20%) chance of AM rain, mostly cloudy with a good (50%) of rain Wednesday afternoon (under 0.10 in. of rain possible), rain at night (0.25 in. of rain possible),
  • Mostly cloudy with rain Thursday, cloudy with evening showers, then a (40%) chance of showers late Thursday night.
  • lows 34-53 cooling to 50 Thursday night highs near 62.
  • Mostly cloudy with a good (50%) chance of AM showers, a good (50%) chance of rain Friday afternoon,
  • Mostly cloudy with rain Saturday and at night,
  • Mostly cloudy and a bit cooler with rain Sunday, rain likely (70%) Sunday night,
  • Then mostly cloudy and a bit cooler with rain Monday.
  • highs 62-58 lows 52-49 (seasonal averages high 58 low 40)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly clear this evening, mostly cloudy with dense fog late tonight,
  • Mostly cloudy with patchy AM fog, partly cloudy and a bit warmer Tuesday afternoon (Halloween), mostly cloudy Tuesday night,
  • Mostly cloudy and a bit cooler with a (30%) chance of rain Wednesday and in the evening, rain likely (70%) late at night (0.10 in. of rain possible),
  • Mostly cloudy with rain and a bit cooler Thursday and in the evening, then rain likely (70%) late Thursday night.
  • lows 37-53 highs 67-63.
  • Cloudy with a good (50%) chance of AM rain, cloudy and a bit cooler with rain likely (70%) Friday afternoon, rain Friday night,
  •  Mostly cloudy with rain Saturday and in the evening, showers late at night,
  • Mostly cloudy with showers likely (70%) Sunday and in the evening, rain late Sunday night,
  • Then mostly cloudy and a bit cooler with rain Monday.
  • highs 62-59 lows 54-52 (seasonal averages high 60 low 43)

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

  • Becoming mostly cloudy late tonight,
  • Mostly cloudy and a bit cooler Tuesday (Halloween), mostly cloudy Tuesday night with a slight (20%) chance of coastal rain late,
  • Mostly cloudy and a bit warmer with a (30%) chance of rain Wednesday (under 0.10 in. of rain possible), evening coastal rain likely (70%) while a (40%) chance of inland evening rain, rain late at night (0.25 in. of rain possible),
  • Mostly cloudy with rain and breezy and a bit cooler Thursday, then cloudy with rain likely (70%) Thursday night.
  • lows 43-54 highs 66-68 cooling back to 66 Thursday.
  • Cloudy with rain likely (70%) Friday afternoon, rain land breezy Friday night,
  • Mostly cloudy with rain and breezy Saturday, evening rain, showers late at night,
  • Mostly cloudy and a bit cooler with showers likely (70%) Sunday and in the evening, rain Sunday night,
  • Then mostly cloudy and a bit cooler with rain Monday.
  • highs 67-64 lows near 53. (seasonal averages high 60 low 45)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Clear this evening, partly cloudy late tonight,
  • A mix of clouds and sun and a bit warmer Tuesday (Halloween), mostly cloudy with a slight (20%) chance of rain late Tuesday night,
  • Mostly cloudy with a slight (20%) chance of AM rain, a bit cooler with a good (50%) chance of rain Wednesday afternoon, a good (50%) chance of evening rain, rain likely (70%) at night,
  • Mostly cloudy with rain and a bit cooler Thursday, then showers Thursday night.
  • free air freezing level 13,000 ft. falling to 12,000 ft. tonight, 12,000 ft. Tuesday, snow level 8,000 ft. Tuesday night, 8,000 ft. rising to above 8,000 ft. Wednesday afternoon through Thursday, then 8,000 ft.  Thursday night.
  • lows 32-42 cooling to 38 Thursday night highs 56-48.
  • Mostly cloudy with AM showers likely (70%) Friday, rain likely (70%) Friday night,
  • Mostly cloudy and a bit warmer with rain Saturday, rain at night,
  • Mostly cloudy and a bit cooler with rain Sunday, rain Sunday night,
  • Then mostly cloudy with rain Monday.
  • snow level 7,500 ft. Friday, above 8,000 ft. Friday night, 8,000 ft. Saturday, above 8,000 ft. Saturday night, 7,000 ft. Sunday and Sunday night, then 6,500 ft. Monday.
  • highs 49-42 lows 38-35.