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November 18, 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 AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 11 AM MST TODAY FOR THE OREGON LOWER TREASURE VALLEY.
  • WINTER WEATHER ADVISORY IS IN EFFECT FROM 7 PM TODAY UNTIL 5 PM SUNDAY ABOVE 4,000 FT. FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
  • A WINTER WEATHER ADVISORY IS IN EFFECT FROM 7 PM TODAY UNTIL 10 AM SUNDAY ABOVE 4,000 FT. FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS AND THE SOUTHERN OREGON CASCADES.
  • A WINTER WEATHER ADVISORY IS IN EFFECT FROM 7 PM THIS EVENING UNTIL 5 PM SUNDAY ABOVE 4,500 FT. FOR THE EAST SLOPES OF THE OREGON CASCADES.

HEALTH ADVISORIES

  • A PUBLIC HEALTH ADVISORY IS IN EFFECT FOR UNSAFE LEVELS OF FECAL BACTERIA IN OCEAN WATERS AT BEVERLY 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 A COMPROMISED IMMUNE SYSTEM SHOULD USE EXTRA CAUTION AS THEY ARE MORE VULNERABLE TO TO ILLNESSES FROM WATERBORNE BACTERIA. VISITORS SHOULD AVOID WADING IN NEARBY CREEKS, POLS OF WATER ON THE BEACH, OR IN DISCOLORED WATER, AND STAY CLEAR OF WATER RUNOFF FLOWING INTO THE OCEAN.
  • 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 CONTINUES 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

  • A cold front is changing our weather. The graphics for days 1-3  show the frontal system that pushed through Pacific Northwest Wednesday and the next coming Saturday. The graphics for days 3-7   Tuesday through Saturday show a cold front slides in Wednesday and then another front tries to come in through the back door (moving NE to SW) next Saturday.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Mostly cloudy with fog and a good (50%) chance of AM rain, rain and warmer this afternoon (0.25 in. of rain possible), evening rain, showers late tonight (0.50 in. of rain possible),
  • Mostly cloudy with showers and a bit cooler Sunday, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late at night,
  • Partly cloudy and a bit cooler Monday, then mostly cloudy with a slight (20%) chance of rain late Monday night.
  • highs 59-50 lows 43-35 warming to 37 Monday night.
  • Mostly cloudy with a slight (20%) chance of AM rain, a bit warmer with a good (50%) chance of rain Tuesday afternoon, mostly cloudy with a good (50%) chance of rain Tuesday night,
  • Cloudy and a bit cooler with a good (50%) chance of rain Wednesday and in the evening, mostly cloudy with a slight (20%) chance of rain late at night,
  • Mostly cloudy with a slight (20%) chance of AM rain, a bit cooler with a slight (20%) chance of showers Thursday afternoon (Thanksgiving Day), partly cloudy with a slight (20%) chance of evening showers, just partly cloudy Thursday night,
  • Then partly cloudy and a bit cooler with a slight (20%) chance of showers Friday.
  • highs 56-50 lows 43-35. (seasonal averages high 52 low 37)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with a good (50%) chance of AM rain, showers and a bit cooler with a slight (20%) chance of thunderstorms this afternoon and evening (0.25 in. of rain possible), showers and snow showers with a slight (20%) chance of thunderstorms, showers late tonight (0.50 in. of rain possible),
  • Mostly cloudy with AM rain and snow showers, showers likely (70%) and a bit cooler Sunday afternoon, a slight (20%) chance of mostly cloudy with patchy fog late at night,
  • AM clouds and fog, sunny and a bit warmer Monday afternoon, then mostly cloudy Monday night.
  • highs 60-52 warming to 54 Monday lows 44-36 warming to 42 Monday night.
  • Mostly cloudy and a bit warmer with a slight (20%) chance of rain Tuesday, a slight (20%) chance of rain Tuesday night,
  • Mostly cloudy and a bit cooler with a (30%) chance of rain Wednesday, a good (50%) chance of rain at night,
  • Mostly cloudy and a bit cooler with a slight (20%) chance of rain Thursday, partly cloudy with a slight (20%) chance of evening rain, just partly cloudy late Thursday night,
  • Then just partly cloudy Friday.
  • highs 58-52 lows 46-38. (seasonal averages high 53 low 40)

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

  • Mostly cloudy with a slight (20%) chance of AM rain, showers with a slight (20%) chance of thunderstorms and a bit cooler this afternoon (0.50 in. of rain possible), showers with a slight (20%) chance of thunderstorms tonight (0.25 in. of rain possible),
  • Mostly cloudy with AM showers likely (70%), a bit cooler with a slight (20%) chance of showers Sunday afternoon, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with patchy fog at night,
  • Mostly cloudy with areas of AM fog, sunny and a bit warmer Monday, then mostly cloudy with a slight (20%) chance of rain late Monday night.
  • highs 65-59 warming to 62 Monday night lows 44-39 warming to warming back to 44 Monday night.
  • Mostly cloudy and a bit warmer with a slight (20%) chance of rain Tuesday, then a (40%) chance of rain Tuesday night.
  • Mostly cloudy and a bit cooler with a good (50%) chance of rain Wednesday, rain likely (70%) at night,
  • Mostly cloudy with a (30%) chance of rain Thursday (Thanksgiving Day), partly cloudy with a slight (20%) chance of rain Thursday night,
  • Some AM clouds, then sunny Friday afternoon.
  • highs 63-60 lows 47-40. (seasonal averages high 56 low 43)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with a good (50%) chance of AM rain, rain and cooler this afternoon (0.25 in. of rain possible), evening snow showers and rain, showers and breezy (Pass Wind: W 15-25 mph gusts to 40 mph) late tonight (1 in. of rain possible, 4-8 in. of snow possible, snow possibly heavy at times),
  • Mostly cloudy with snow and rain showers and a bit cooler Sunday (snow possibly heavy at times), partly cloudy with a good (50%) chance of evening snow and rain shows showers, just partly cloudy late at night,
  • Mostly sunny and a bit warmer Monday, then partly cloudy Monday night.
  • snow level 7,000 ft. today, 5,500 ft. falling to 3,500 ft. late tonight, 3,500 ft. Sunday, 3,000 ft. Sunday night, free air freezing level 12,000 ft  Monday, then 13,000 ft. Monday night.
  • highs 48-32 warming to 43 Monday lows 27-22 warming to 29 Monday night.
  • Clouds and sun with a slight (20%) chance of AM rain, a mix of clouds and sun and a bit warmer with a (40%) chance of rain Tuesday afternoon, mostly cloudy with a good (50%) chance of rain Tuesday night,
  • Mostly cloudy with rain and a bit cooler Wednesday, evening rain and snow likely (70%), just mostly cloudy at night,
  • Clouds and sun with a good (50%) chance of AM rain and snow, a mix of clouds and sun and a bit cooler with a good (50%) chance of rain and snow showers Thursday afternoon (Thanksgiving Day), partly cloudy with a slight (20%) chance of rain and snow showers Thursday night,
  • Then partly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Friday.
  •  snow level 7,500 ft. Tuesday and Tuesday night, 7,000 ft. Wednesday, 5,500 ft. Wednesday night, 5,000 ft. Thursday, then 4,000 ft. Thursday night and Friday.
  •  highs 43-52 cooling to 38 Thursday lows 30-33 cooling back to 30 Wednesday night.