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Tim Chuey Weather

by | Dec 18, 2023 | Weather

December 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 PM MST TONIGHT FOR HARNEY COUNTY, BAKER COUNTY, MALHEUR COUNTY, AND THE OREGON LOWER TREASURE VALLEY.
  • A WIND ADVISORY IS IN EFFECT FROM 4 PM MONDAY  UNTIL 7 AM TUESDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
  • A WIND ADVISORY IS IN EFFECT UNTIL 3 PM TUESDAY FOR THE GRANDE RONDE VALLEY.
  • A WIND ADVISORY IS IN EFFECT UNTIL 1 AM TUESDAY FOR JACKSON COUNTY.

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 High Pressure Ridge (“Arch” shape) is slowly moving eastward to be replaced by Upper Level Low Pressure (“U” shape) offshore. The graphics for days 1-3  show a front ready to move in Tuesday . The graphics for days 3-7  Thursday through Monday show active frontal systems moving through the Eastern Pacific region and into the Pacific Northwest. A cold front pushes through between Friday and Saturday. Another frond will be offshore next Monday.

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:

  • Mostly cloudy with rain tonight (0.25 in. of rain possible)
  • Mostly cloudy and a bit warmer with rain Tuesday (0.10 in. of rain possible), a slight (20%) chance of evening rain, mostly cloudy with patchy fog late Tuesday night,
  • Patchy AM fog, a mix of clouds and sun and a bit cooler Wednesday, partly cloudy in the evening, mostly cloudy with patchy fog late at night,
  • A mix of clouds and sun and a bit cooler Thursday (Winter Solstice 7:27 PM), mostly cloudy a slight (20%) chance of evening rain, then rain likely (70%) Thursday night.
  • lows near 42 highs 55-49.
  • Mostly cloudy with rain Friday, evening rain likely (70%), a (40%) chance of rain late Friday night,
  • Clouds and sun and a bit cooler with a (40%) chance of AM rain, a mix of clouds and sun and a bit cooler Saturday, a slight (20%) chance of rain Saturday night,
  • Mostly cloudy with a (30%) chance of AM rain and snow, a (30%) chance of rain and a bit cooler Sunday afternoon, a (30%) chance of rain Sunday night with a (30%) of snow late,
  • Then mostly cloudy and a bit warmer with a good (50%) chance of rain and snow Monday (Christmas Day).
  • highs 49-45 warming back to 49 Monday lows 35-32 warming to 34 Sunday night. (seasonal averages high 46 low 34)

Forecast for the Umpqua Valley including Roseburg:

  • Mostly cloudy with early evening rain likely (70%), rain tonight (under 0.10 in. of rain possible),
  • Mostly cloudy with AM rain, rain likely (70%) Tuesday afternoon (0.25 in. of rain possible), a (30%) chance of rain Tuesday night and patchy fog late (under 0.10 in. of rain possible),
  • Mostly cloudy with areas of AM fog, sunny Wednesday afternoon, partly cloudy with patchy fog at night,
  • Some AM clouds with patchy fog, sunny Thursday afternoon (Winter Solstice 7:27 PM), partly cloudy in the evening, then mostly cloudy with a slight (20%) chance of rain late  Thursday night.
  • lows 50-42 highs 56-48.
  • Mostly cloudy with rain likely (70%) and a bit cooler Friday, evening rain and snow likely (70%), a good (50%) chance of rain and snow late Friday night,
  • Mostly cloudy with a slight (20%) chance of rain and snow, and a bit cooler Saturday, partly cloudy in the evening rain, a slight (20%) chance of rain late at night,
  • Mostly cloudy with a slight (20%) chance of rain and a bit warmer Sunday, a slight (20%) chance of rain Sunday night,
  • Then mostly cloudy with a (30%) chance of rain Monday (Christmas Day).
  • highs 48-44 warming to 48 Monday lows 37-34 warming to 36 Sunday night (seasonal averages high 48 low 36).

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

  • Mostly cloudy with coastal rain tonight while inland early evening rain likely (70%) continuing late tonight (0.25 in. of rain possible),
  • Mostly cloudy with AM rain, rain likely (70%) and slightly warmer Tuesday afternoon (0.25 in. of rain possible),  a (30%) chance of rain Tuesday night with inland patchy fog (under 0.10 in. of rain possible),
  • Some AM clouds with patchy fog,  sunny and a bit warmer with patchy fog Wednesday afternoon, mostly clear in the evening, partly cloudy late at night,
  • Some AM clouds, sunny and a bit cooler Thursday afternoon (Winter Solstice 7:27 PM), then mostly cloudy with a (30%) chance of rain Thursday night.
  • lows 52-42 highs 58-60 cooling to 57 Thursday.
  • Mostly cloudy with rain and a bit cooler Friday, a good (50%) chance of rain Friday night,
  • Mostly cloudy and a bit cooler with a slight (20%) chance of rain Saturday, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late at night,
  • Mostly cloudy and a bit warmer with a slight (20%) chance of rain Sunday, a slight (20%) chance of rain Sunday night,
  • Then mostly cloudy and a bit warmer with a (40%) chance of rain Monday.
  • highs 54-52 Monday warming to 57 Monday lows near 37. (seasonal averages high 53 low 40)

Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Mostly cloudy with rain tonight (0.25 in. of rain possible),
  • Mostly cloudy and a bit warmer with rain Tuesday (0.25 in. of rain possible), a good (50%) chance of evening rain, partly cloudy with a slight (20%) chance of rain late Tuesday night,
  • Partly cloudy start, sunny and a bit warmer Wednesday, mostly at night,
  • Mostly sunny and a bit warmer Thursday (Winter Solstice 7:27 PM),  partly cloudy with a slight (20%) chance of evening , then a good (50%) chance of rain Thursday night.
  • snow level 7,000 ft. tonight and Tuesday, 6,500 ft. Tuesday night, free air freezing level 9,000 ft. Wednesday through Thursday, then snow level 6,500 ft. Thursday night.
  • lows 35-30 highs 42-46.
  • Mostly cloudy with a good (50%) chance of AM rain and snow, rain and snow and a bit cooler Friday afternoon, evening snow likely (70%) with a slight (20%) chance of rain, mostly cloudy with good (50%) chance of snow and rain late Friday night,
  • Clouds and sun with a good (50%) chance of AM rain and snow, a mix of clouds and sun with a good (50%) chance of snow Saturday afternoon, partly cloudy with a slight (20%) chance of rain and snow at night,
  • Clouds and sun with a (30%) chance of AM snow and a slight (20%) chance of rain, a (30%) chance of rain and a bit warmer Sunday afternoon, partly cloudy with a (40%) chance of rain and snow Sunday night,
  • Then a mix of clouds and sun with a good (50%) chance of snow and rain Monday.
  • snow level 5,000 ft. Friday, 3,000 ft. Friday night, 2,500 ft. Saturday, 2,000 ft. Saturday night, 2,500 ft. Sunday, 3,500 ft. Sunday night, then 4,000 ft. Monday.
  • highs 36-30 warming to 39 Monday lows 22-20 warming to 26 Sunday night.