Patchy AM fog, more clouds, maybe some sun peeks, this afternoon.

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 WATCH IS IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH THURSDAY MORNING FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON 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 for the weekend. The graphics for days 1-3 show a weak frontal system moving through Wednesday. The graphics for days 3-7  Friday through next Tuesday show a front moving in Friday night into early Saturday.

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THE AIR QUALITY INDEX:

For the local area:

Eugene/Springfield: The Air Quality Index is 36 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 54 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 44 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:

  • Mostly cloudy with patchy AM fog, mostly cloudy with possible sun peeks, and a bit cooler this afternoon, mostly cloudy tonight,
  • A mix of clouds and sun and a bit cooler Wednesday, mostly clear with patchy frost late at night,
  • Patchy AM frost, mostly sunny and a bit cooler Thursday afternoon, then becoming mostly cloudy late Thursday night.
  • highs 65-57 lows 45-35.
  • Mostly cloudy and a bit cooler with a (40%) chance of rain Friday, a good (50%) chance of showers Friday night,
  • Partly cloudy and a bit cooler with a slight (20%) chance of showers Saturday and in the evening, partly cloudy with widespread frost at night and Sunday AM, becoming mostly sunny and  bit cooler Sunday afternoon, mostly clear with widespread frost late Sunday night,
  • Widespread frost again Monday AM, then partly cloudy and a bit warmer Monday afternoon.
  • highs 56-52 warming to 55 Monday lows 39-29 (seasonal averages high 62 low 41)

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Forecast for the Umpqua Valley including Roseburg:

  • Patchy dense fog this AM, sunny and a bit warmer this afternoon, mostly cloudy late tonight,
  • AM clouds, partly cloudy and cooler Wednesday afternoon and evening, mostly clear and colder late at night,
  • Some AM clouds with areas of frost and patchy fog, sunny and a bit cooler Thursday afternoon, then partly cloudy with areas of frost late Thursday night.
  • highs 70-59 lows 48-35.
  • Partly cloudy with areas of AM frost, mostly cloudy and a bit warmer with a slight (20%) chance of showers Friday and Friday night,
  • Mostly cloudy and a bit cooler with a slight (20%) chance of showers Saturday, partly cloudy and colder with areas of frost late at night,
  • Partly cloudy with widespread AM and late night widespread frost, partly cloudy and a bit cooler Sunday afternoon, mostly clear Sunday night,
  • AM sun with widespread frost, then partly cloudy and a bit warmer Monday afternoon.
  • highs 62-55 warming back to 62 Monday lows 42-32. (seasonal averages high 64 low 44)

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

  • Sunny and a bit warmer today, becoming mostly cloudy with patchy inland fog late tonight,
  • AM clouds, partly cloudy and a bit cooler Wednesday afternoon, mostly clear and colder at night,
  • Partly cloudy and a bit cooler Thursday, then partly cloudy Thursday night.
  • highs 69-62 lows 49-40.
  • Partly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit warmer with a (30%) chance of showers Friday afternoon and Friday night,
  • Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit cooler with a slight (20%) chance of showers Saturday afternoon and evening, mostly clear and colder at night,
  • Mostly sunny and  bit cooler Sunday, mostly clear Sunday night,
  • AM sun, then partly cloudy and a bit warmer Monday afternoon.
  • highs 63-59 warming to 62 Monday lows 45-38. (seasonal averages high 60 low 46).

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Forecast for the Northern Oregon Cascades including Willamette Pass:

  • AM sun, partly cloudy and a bit cooler this afternoon, becoming mostly cloudy with a slight (20%) chance of showers late tonight,
  • Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and cooler with a slight (20%) chance of showers Wednesday afternoon, becoming partly cloudy with widespread frost late at night,
  • More widespread AM frost, becoming mostly sunny and a bit warmer Thursday afternoon, then partly cloudy Thursday night.
  • free air freezing level 12,000 ft. today, snow level above 8,000 ft. tonight, 6,000 ft. falling to 5,000 ft. Wednesday afternoon, free air freezing level 6,500 ft. falling to 5,500 ft. late Wednesday night, 6,000 ft. Thursday, then 8,000 ft. Thursday night.
  • highs 54-42 lows 36-22 warming to 24 Thursday night.
  • Mostly cloudy and a bit warmer with a (40%) chance of rain Friday, a good (50%) chance of showers Friday night,
  • A mix of clouds and sun and cooler with a good (50%) chance of showers Saturday, partly cloudy with a slight  (20%) chance of showers at night,
  • A slight (20%) chance of AM showers, just partly cloudy and a bit warmer Sunday afternoon and Sunday night,
  • Then partly cloudy and a bit warmer Monday.
  • snow level 3,500 ft. rising to 6,000 ft. Friday afternoon, 6,500 ft. falling to 3,500 ft. late Friday night, 3,500 ft. Saturday, 1,500 ft. Saturday night, free air freezing level 2,000 ft. rising to 6,000 ft. Sunday afternoon, 6,000 ft. Sunday night, then 9,000 ft. Monday.
  • highs 45-37 lows 25-27 cooling to 19 Sunday.

 

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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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