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Tim Chuey Weather

by | Dec 21, 2023 | Weather

December 21, 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 11 AM MST FRIDAY FOR HARNEY COUNTY AND MALHEUR COUNTY.
  • A DENSE FOG ADVISORY IS IN EFFECT UNTIL 10 AM FRIDAY FOR THE FOOTHILLS OF 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 a cold front moving through Oregon Friday. The graphics for days 3-7  Sunday through Thursday show multiple frontal systems sitting offshore ready to move into the Pacific Northwest and one right at the coast next Thursday.

Note: The Winter Solstice occurs at 7:27 pm this evening as the official beginning of astronomical Winter.

Forecast For The South Willamette Valley Including Eugene-Springfield:

  • Mostly cloudy with patchy fog and rain (under 0.10 in. of rain possible) late tonight (Winter Solstice 7:27 PM),
  • Mostly cloudy with AM rain, partly cloudy and a bit warmer with rain Friday afternoon (0.10 in. of rain possible), partly cloudy with patchy fog and a slight (20%) chance of evening rain, patchy fog late Friday night (under 0.10 in. of rain possible),
  • Patchy AM fog, a mix of clouds and sun and cooler Saturday afternoon, partly cloudy with patchy evening fog, mostly cloudy with patchy fog late at night,
  • Mostly cloudy with  (30%) chance of AM rain, rain likely (70%) and a bit warmer Sunday afternoon and evening, then a good (50%) chance of rain late Sunday night.
  • lows 42-29 warming to 38 Sunday night highs 50-40 warming to 42 Sunday.
  • Cloudy with a good (50%) chance of AM rain, rain likely (70%) and warmer Monday afternoon (Christmas Day), rain likely (70%) Monday night,
  • Mostly cloudy with a good (50%) and a bit warmer Tuesday, cloudy with a good (50%) chance of rain at night,
  • Mostly cloudy and a bit cooler with rain Wednesday, rain Wednesday night,
  • Then mostly cloudy and a bit cooler with rain likely (70%) Thursday.
  • highs 52-55 cooling back to 52 Thursday lows near 43. (seasonal averages high 46 low 34)

Forecast for the Umpqua Valley including Roseburg:

  • Becoming patchy fog and a (30%) chance of rain tonight,
  • Mostly cloudy with AM rain, patchy fog with a slight (20%) chance of rain and a (30%) chance of freezing rain and cooler Friday afternoon (under 0.10 in. of rain possible), a (30%) of evening rain, partly cloudy with patchy fog late Friday night (under 0.10 in. of rain possible),
  • Partly cloudy with patchy AM fog, just partly cloudy and a bit cooler Saturday afternoon and evening, mostly cloudy with patchy fog late at night,
  • Mostly cloudy with patchy AM fog, a (30%) chance of rain and a bit warmer Sunday afternoon, then a good (50%) chance of rain Sunday night.
  • lows 45-33 warming to 39 Sunday night highs 47-43 warming to 48 Sunday.
  • Mostly cloudy and a bit warmer with a (40%) chance of rain Monday (Christmas Day), evening rain likely (70%), a good (50%) chance of rain Monday night,
  • Mostly cloudy and a bit warmer with a (40%) chance of rain Tuesday and at night,
  • Mostly cloudy with AM rain likely (70%), rain Wednesday afternoon. rain Wednesday night,
  • Mostly cloudy with AM rain likely (70%), then a good (50%) chance of rain and a bit cooler Thursday afternoon.
  • highs 50-55 cooling to 52 Thursday lows 46-44 (seasonal averages high 48 low 36).

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

  • Partly cloudy with patchy dense evening coastal fog with late evening rain likely and continuing (Winter Solstice 7:27 PM) while mostly cloudy with patchy dense fog and a (40%) chance of evening rain (20%) with patchy dense inland fog tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with AM coastal rain and a good (50%) chance of coastal rain and a bit warmer Friday afternoon while a (30%) chance of inland rain and a bit warmer Friday (0.25 in. of rain possible), a (40%) chance of evening coastal rain while a (30%) chance of inland evening rain, patchy fog late Friday night (under 0.10 in. of rain possible),
  • AM clouds with patchy fog, sunny Saturday afternoon, mostly cloudy with patchy fog late at night,
  • Mostly cloudy with patchy AM fog and a good (50%) chance of rain, rain likely (70%) a bit warmer Sunday afternoon, rain likely (70%) Sunday night.
  • lows 44-36 warming to 42 Saturday night highs 53-55.
  • Mostly cloudy with rain likely (70%) and a bit warmer Monday (Christmas Day), rain likely (70%) Monday night,
  • Mostly cloudy and a bit warmer with rain likely (70%) Tuesday, rain likely (70%) at night,
  • Mostly cloudy with AM rain likely (70%), rain and a bit cooler Wednesday afternoon, rain and breezy Wednesday night,
  • Mostly cloudy and breezy with AM rain likely (70%), then breezy and a bit cooler with a good (50%) chance of rain Thursday afternoon.
  • highs 59-63 cooling to 58 Thursday lows 48-46 (seasonal averages high 53 low 40)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Partly cloudy with a good (50%) chance of rain developing late tonight (Winter Solstice 7:27 PM) (0.10 in of rain possible),
  • Mostly cloudy with AM snow and rain,  a good (50%) chance of snow rain and a bit warmer Friday afternoon, partly cloudy with a good (50%) chance of evening snow, just partly cloudy late Friday night,
  • Mostly sunny start, partly cloudy and a bit cooler Saturday afternoon, partly cloudy at night,
  • A mix of clouds and sun with a slight (20%) chance of rain and snow and a bit warmer Sunday, mostly cloudy with a good (50%) chance of rain and snow Sunday night.
  • snow level 6,500 ft. tonight, 5,000 ft. falling to 3,000 ft. Friday,  free air freezing level at the surface Friday night, at the surface rising to 4,500 ft. Saturday afternoon, 6,000 ft. rising to 7,000 ft. late Saturday night, snow level  3,000 ft. Sunday, then 4,500 ft. Sunday night.
  • lows 30-17 warming to 27 Sunday night highs 46-34 warming to 38 Sunday.
  • Mostly cloudy with a good (50%) chance of AM rain and snow, rain likely (70%) and a bit warmer Monday afternoon  (Christmas Day), rain and snow likely (70%) Monday night,
  • Mostly cloudy with a good (50%) chance of AM rain and snow, a bit warmer with a good (50%) chance of rain Tuesday, mostly cloudy with a good (50%) chance of evening rain, a (40%) chance of rain and snow late Tuesday night,
  • Mostly cloudy with AM rain likely (70%) with a good (50%) chance of snow, rain with snow likely (70%) Wednesday afternoon, rain and snow Wednesday night,
  • Then rain and snow likely (70%) and a bit cooler Thursday.
  •  snow level 5,500 ft. Monday, 6,500 ft. Monday night, 7,000 ft. Tuesday, 6,500 ft. Tuesday night,  6,000 ft. Wednesday, 5,000 ft. Wednesday night, then 4,500 ft. Thursday.
  • highs 39-42 cooling to 36 Thursday lows 32-34 cooling to 30 Wednesday night.