Patchy AM frost, partly cloudy, a bit cooler for your Thursday.

Check out my latest Eugene Daily News “Weather Or Not” column now at:

Just One More Thing To Prepare For.

Here is my weekly weather quiz question. What is “Vertical Velocity?” The First person to post the correct answer as a comment will win a week of free personalized weather forecasts tailored to your needs. 

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ADVISORIES:

  • A FREEZE WARNING IS IN EFFECT FROM 1 AM UNTIL 9 AM TODAY FOR THE EASTERN COLUMBIA RIVER GORGE, THE LOWER COLUMBIA BASIN OF OREGON, THE JOHN DAY BASIN, THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, AND NORTH CENTRAL OREGON.
  • A FREEZE WARNING IS IN EFFECT FROM 2 AM UNTIL 9 AM TODAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
  • A FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 9 AM TODAY FOR THE COAST RANGE OF NORTHWEST OREGON, THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE NORTHERN OREGON CASCADE FOOTHILLS, AND THE CASCADE FOOTHILLS IN LANE COUNTY.
  • A FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 9 AM TODAY FOR CENTRAL DOUGLAS COUNTY.

HEALTH ADVISORIES:

  • THE OREGON HEALTH AUTHORITY HAS ISSUED A RECREATIONAL USE HEALTH ADVISORY FOR HOWARD’S BAY AND THE SURROUNDING AREA ON UPPER KLAMATH LAKE DUE TO THE PRESENCE OF CYANOBACTERIA (HARMFUL ALGAE) BLOOM THAT HISTORICALLY PRODUCES CYANOTOXINS (HARMFUL ALGAE TOXINS) ABOVE RECREATIONAL GUIDELINE VALUES FOR HUMAN EXPOSURE. MOORE PARK IS LOCATED ON THE SOUTHERN END OF UPPER KLAMATH LAKE IN KLAMATH COUNTY. UNTIL THE ADVISORY IS LIFTED PEOPLE SHOULD AVOID SWIMMING AND HIGH-SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE LAKE WHERE BLOOMS ARE IDENTIFIED. ALTHOUGH TOXINS ARE NOT ABSORBED THROUGH THE SKIN, PEOPLE WITH SKIN SENSITIVITIES MAY EXPERIENCE A PUFFY RED RASH. VISITING ODELL LAKE IS SAFE AS LONG AS ANY BOATING OR OTHER ACTIVITIES DO NOT CAUSE EXCESSIVE WATER SPRAY WHICH COULD LEAD TO INHALATION RISKS IF THERE IS EXCESSIVE WATER SPRAY.
  • THE OREGON HEALTH AUTHORITY HAS ISSUED A PUBLIC HEALTH ADVISORY FOR HIGHER-THAN-NORMAL LEVELS OF BACTERIA IN OCEAN WATERS AT SUNSET BAY STATE PARK IN COOS COUNTY. PEOPLE SHOULD AVOID DIRECT CONTACT WITH WATER IN THIS AREA UNTIL THE ADVISORY IS LIFTED. HIGHER-THAN-NORMAL LEVELS OF FECAL BACTERIA CAN CAUSE DIARRHEA, STOMACH CRAMPS, SKIN RASHES, UPPER RESPIRATORY INFECTIONS AND OTHER ILLNESSES. THIS APPLIES ESPECIALLY TO CHILDREN AND THE ELDERLY, WHO MAY BE MORE VULNERABLE TO ILLNESSES FROM WATERBORNE BACTERIA. VISITORS SHOULD AVOID WADING IN NEARBY CREEKS, POOLS OF WATER ON THE BEACH, OR IN DISCOLORED WATER, AND STAY CLEAR OF WATER RUNOFF FLOWING INTO THE OCEAN.
  • THE OREGON HEALTH AUTHORITY HAS ISSUED A RECREATIONAL USE HEALTH ADVISORY FOR ODELL LAKE IN KLAMATH COUNTY DUE TO THE PRESENCE OF CYANOBACTERIA (HARMFUL ALGAE) BLOOM THAT HISTORICALLY PRODUCES CYANOTOXINS (HARMFUL ALGAE TOXINS) ABOVE RECREATIONAL GUIDELINE VALUES FOR HUMAN EXPOSURE. UNTIL THE ADVISORY IS LIFTED PEOPLE SHOULD AVOID SWIMMING AND HIGH-SPEED WATER ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS OF THE LAKE WHERE BLOOMS ARE IDENTIFIED. ALTHOUGH TOXINS ARE NOT ABSORBED THROUGH THE SKIN, PEOPLE WITH SKIN SENSITIVITIES MAY EXPERIENCE A PUFFY RED RASH. VISITING ODELL LAKE IS SAFE AS LONG AS ANY BOATING OR OTHER ACTIVITIES DO NOT CAUSE EXCESSIVE WATER SPRAY WHICH COULD LEAD TO INHALATION RISKS IF THERE IS EXCESSIVE WATER SPRAY.
  • A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER DUE TO BLUE-GREEN ALGAE. SIGNS ARE POSTED.

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THE WEATHER PATTERN

  • An Upper Level High Pressure Ridge (Shaded “Arch” shape with arrows) keeps us in a northwest airflow, then an Upper Level Low Pressure Trough (Shaded “U” shape with arrows) will give us a drastic weather change toward the weekend. The graphics for days 1-3 show the weak frontal system that moved through Oregon and another front sliding in Friday. The graphics for days 3-7  Sunday through next Thursday show the front that moved through the Pacific Northwest well south of us, then no frontal activity through next Thursday.

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THE AIR QUALITY INDEX:

For the local area:

Eugene/Springfield: The Air Quality Index is 34 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 46 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 46 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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FORECASTS:

Forecast for the Southern Willamette Valley including Eugene-Springfield:

  • Patchy AM frost, partly cloudy and a bit cooler this afternoon and tonight with areas of frost late,
  • Partly cloudy with patchy AM frost, mostly cloudy with a good (50%) chance of rain Friday and Friday night,
  • Partly cloudy and a bit cooler Saturday, mostly clear with widespread frost late at night.
  • highs 58-56 lows 34-42 cooling to 27 Saturday night.
  • Mostly sunny and a bit cooler Sunday, mostly clear with widespread frost late Sunday night and Monday AM, mostly sunny in the  afternoon, partly cloudy Monday night,
  • Partly cloudy and a bit warmer Tuesday through Wednesday.
  • highs 52-60 lows 25-35 (seasonal averages high 61 low 40)

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Forecast for the Umpqua Valley including Roseburg:

  • Areas of frost this AM, sunny and a bit cooler this afternoon, partly cloudy tonight,
  • AM sun with areas of frost, becoming mostly cloudy and a bit warmer with a (30%) chance of rain Friday afternoon, cloudy with a good (50%) chance of rain at night,
  • AM clouds, partly cloudy and a bit cooler Saturday afternoon, then mostly clear and colder with areas of frost late Saturday night.
  • highs 59-65 cooling back to 59 Saturday lows 37-44 cooling to 32 Saturday night.
  • AM sun with widespread frost, sunny and a bit cooler Sunday afternoon, mostly clear Sunday night,
  • Mostly sunny and a bit warmer Monday, mostly clear with areas of frost late at night,
  • Areas of AM frost, mostly sunny and a bit warmer Tuesday afternoon and Wednesday, mostly clear Tuesday night.
  • highs 57-67 lows 29-37. (seasonal averages high 63 low 44)

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

  • Sunny and a bit warmer today, partly cloudy this evening, clearing late tonight,
  • Some AM coastal clouds, becoming mostly cloudy and a bit cooler with a (30%) chance of coastal rain Friday afternoon while AM inland sun and becoming mostly cloudy with a slight (20%) chance of inland afternoon rain, cloudy with a (30%) chance of rain at night,
  • AM clouds, sunny and a bit cooler Saturday afternoon, then mostly clear and colder Saturday night.
  • highs 64-62 lows 39-49 cooling to 37 Saturday night.
  • Mostly sunny and  bit cooler Sunday, mostly clear Sunday night,
  • Mostly sunny and a bit warmer Monday, Tuesday, and Wednesday, mostly clear each night.
  • highs 60-66 lows 36-45. (seasonal averages high 60 low 46).

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Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Partly cloudy with more widespread AM frost, partly cloudy this afternoon and tonight,
  • Partly cloudy and a bit warmer with a good (50%) chance of rain Friday, mostly cloudy with rain at night,
  • A good (50%) chance of AM rain and snow, just partly cloudy and cooler Saturday afternoon, then mostly clear Saturday night.
  • free air freezing level 4,000 ft. rising to 6,000 ft. this afternoon, 7,500 ft. rising to 10,000 ft. late tonight, snow level 3,000 ft. rising to above 8,000 ft. Friday afternoon, above 8,000 ft. falling to 7,500 ft. late Friday night, 4,500 ft. Saturday morning, then free air freezing level 6,000 ft. falling to 2,000 ft. Saturday night.
  • highs 44-47 cooling to 37 Saturday lows 25-30 cooling to 16 Saturday night.
  • Mostly sunny and a bit cooler Sunday, mostly clear Sunday night,
  • Mostly sunny and a bit warmer Monday, partly cloudy at night,
  • Partly cloudy and a bit warmer Tuesday, partly cloudy Tuesday night,
  • Partly cloudy with a slight (20%) chance of AM showers, then just partly cloudy and a bit warmer Wednesday afternoon.
  • free air freezing level 1,500 ft. rising to 4,000 ft. Sunday afternoon, 5,500 ft. falling to 4,000 ft. late Sunday night, 5,000 ft. rising to 8,000 ft. Monday afternoon, 10,000 ft. rising to 11,000 ft. Monday night,  12,000 ft. rising to 13,000 ft. Tuesday afternoon, 14,000 ft. Tuesday night, snow level 8,000 ft. Wednesday AM, then free air freezing level 13,000 ft. Wednesday afternoon.
  • highs 43-55 lows 17-32.

 

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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 change due to unexpected changes in atmospheric conditions, so there are no guarantees that the actual weather will conform to the projected forecast.

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For all of your Lane County and Eugene-Springfield News, Weather and Sports go to: eugenedailynews.com

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