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Tim Chuey Weather

by | Dec 19, 2023 | Weather

December 20, 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 DENSE FOG ADVISORY IS IN EFFECT UNTIL 10 AM TODAY FOR THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, AND THE SOUTH WILLAMETTE VALLEY.
  • A DENSE FOG ADVISORY IS IN EFFECT UNTIL NOON TODAY FOR THE NORTHERN BLUE MOUNTAINS OF OREGON.

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

An Upper Level Low Pressure Trough (“U” shape) is just offshore. The graphics for days 1-3  show no fronts ready to move into Oregon. The graphics for days 3-7  Saturday through Wednesday show multiple frontal systems sitting offshore ready to move into the Pacific Northwest.

Note: The Winter Solstice occurs at 7:27 pm this Thursday December 21st as the official beginning of astronomical Winter.

Forecast For The South Willamette Valley Including Eugene-Springfield:

________________

  • Patchy dense AM fog, partly cloudy and cooler this afternoon, partly cloudy with patchy fog tonight,
  • Patchy dense AM fog, a mix of clouds and sun and a bit cooler Thursday afternoon (Winter Solstice 7:27 PM), mostly cloudy with patchy fog and rain likely (70%) late at night,
  • Mostly cloudy and a bit cooler with rain Friday and in the evening, then patchy fog late Friday night.
  • highs 51-48 lows 42-36.
  • Clouds and sun with patchy AM fog and a (40%) chance of rain, a mix of clouds and sun and a bit cooler Saturday afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain and snow late Saturday night,
  • Patchy AM fog with a slight (20%) chance of rain, mostly cloudy with a good (50%) chance of rain and a bit cooler Sunday afternoon and at night,
  • Mostly cloudy with patchy AM fog and a (40%) chance of rain, rain likely (70%) and a bit warmer Monday (Christmas Day), rain likely (70%) Monday night,
  • Then mostly cloudy with rain likely (70%) and a bit warmer Tuesday.
  • highs 47-42 warming to 46 Tuesday lows 32-42. (seasonal averages high 46 low 34)

Forecast for the Umpqua Valley including Roseburg:

  • Some AM clouds with patchy fog, sunny and cooler this afternoon, mostly clear this evening, mostly cloudy with patchy fog late tonight,
  • Some AM clouds with patchy fog, sunny and a bit warmer Thursday afternoon (Winter Solstice 7:27 PM), partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late at night,
  • Mostly cloudy with AM rain, showers and a bit cooler Friday and evening, then a good (50%) chance of rain and snow showers late Friday night.
  • highs 52-55 cooling to 48 Friday lows 42-46.
  • Mostly cloudy start, partly cloudy and a bit cooler Saturday afternoon and evening, mostly cloudy with  a slight (20%) chance of rain late Saturday night,
  • Mostly cloudy with a slight (20%) chance of rain and a bit warmer Sunday, a (40%) chance of rain at night,
  • Mostly cloudy with a (30%) chance of rain Monday (Christmas Day), rain likely (70%) Monday night,
  • Then mostly cloudy and a bit warmer with rain likely (70%) Tuesday.
  • highs 46-54 lows 37-44 (seasonal averages high 48 low 36).

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

  • Sunny and a bit warmer today, mostly clear this evening, mostly cloudy with patchy fog late tonight,
  • AM clouds with patchy fog, sunny Thursday afternoon (Winter Solstice 7:27 PM), mostly cloudy with a slight (20%) chance of evening coastal with coastal rain late at night while partly cloudy with a good (50%) chance of evening inland rain and mostly cloudy with inland rain late at night (under 0.10 in. of rain possible).
  • Mostly cloudy with AM rain, showers and a bit cooler Friday afternoon, then a good (50%) chance of showers and colder Friday night.
  • highs 59-55 lows 42-44 cooling to 39 Friday night.
  • Mostly cloudy start, partly cloudy and a bit cooler Saturday afternoon and evening, mostly cloudy with a slight (20%) chance of rain late Saturday night,
  • Mostly cloudy and a bit warmer with a (40%) chance of rain Sunday, a good (50%) chance of rain at night,
  • Mostly cloudy and a bit warmer with a good (50%) chance of rain Monday (Christmas Day), rain likely (70%) Monday night,
  • Then mostly cloudy with rain likely (70%) and a bit warmer Tuesday.
  • highs 52-62 lows 36-45 (seasonal averages high 53 low 40)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Some AM clouds, sunny and a bit cooler this afternoon, mostly tonight,
  • Mostly sunny and a bit warmer Thursday (Winter Solstice 7:27 PM), partly cloudy with rain likely (70%) at night,
  • Mostly cloudy with snow and rain and cooler Friday, then snow and rain late Friday night.
  • free air freezing level 8,000 ft. today, 9,000 ft. tonight and Thursday, snow level 6,500 ft. Thursday night, 5,000 ft. Friday, then 3,000 ft. Friday night.
  • highs 42-46 lows 32-22.
  • Mostly cloudy with a good (50%) chance of AM rain, a mix of clouds and sun with a good (50%) chance of snow and a bit cooler Saturday afternoon, partly cloudy with a slight (20%) chance of snow Saturday night,
  • A mix of clouds and sun with a good (50%) chance of snow and rain and a bit warmer Sunday, mostly cloudy with a good (50%) chance of rain and snow Sunday night,
  • Clouds and sun with a good (50%) chance of AM rain and snow, a mix of clouds and sun with rain likely (70%) and a bit warmer Monday afternoon, rain and snow likely (70%) Monday night,
  • Then mostly cloudy and a bit warmer with rain likely (70%) Tuesday.
  • snow level  2,500 ft. Saturday and Saturday night, 3,000 ft. Sunday, 4,000 ft. Sunday night, 5,000 ft. Monday, 5,500 ft. Monday night, then 5,000 ft. Tuesday.
  • highs 36-30 warming to 39 Monday lows 22-20 warming to 26 Sunday night.