Mostly cloudy late tonight, clouds and sun, chance of getting wet Wednesday.

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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 toward 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 25 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 52 in the Moderate 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:

  • Partly cloudy this evening, mostly cloudy late tonight,
  • Clouds and sun with a slight (20%) chance of AM rain, a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Wednesday afternoon, partly cloudy and colder with patchy frost late Wednesday night and Thursday AM, partly cloudy and a bit cooler Thursday afternoon and at night,
  • Clouds and  with a slight (20%) chance of AM rain, cloudy with a good (50%) chance of rain and a bit cooler Friday afternoon and Friday night.
  • lows 45-35 warming to 40 Friday night highs 62-56.
  • Mostly cloudy with a slight (20%) chance of AM showers, just partly cloudy and a bit cooler Saturday afternoon, partly cloudy with widespread frost late Saturday night and Sunday AM, becoming mostly sunny and a bit cooler in afternoon, mostly clear with widespread frost late Sunday night,
  • Widespread frost again Monday AM, partly cloudy and a bit warmer Monday afternoon and at night,
  • Then partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday.
  • highs 54-52 warming to 58 Tuesday lows 29-34 (seasonal averages high 62 low 40)

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Forecast for the Umpqua Valley including Roseburg:

  • Variable evening cloudiness, mostly cloudy late tonight and Wednesday AM, partly cloudy and cooler in the afternoon, mostly clear in the evening, partly cloudy and colder with areas of frost late Wednesday night,
  • Areas of AM and late night frost, partly cloudy and a bit cooler Thursday and at night,
  • Partly cloudy with areas of AM frost, mostly cloudy and a bit warmer with a slight (20%) chance of showers Friday afternoon, then cloudy with a good (50%) chance of showers Friday night.
  • lows 47-35 warming to 43 Friday night highs 62-59 warming back to 62 Friday.
  • AM clouds, partly cloudy and a bit cooler with a slight (20%) chance of showers Saturday afternoon and evening, mostly clear and colder with areas of frost late Saturday night,
  • Widespread AM and late night frost, mostly sunny and a bit cooler Sunday and Monday, mostly clear both nights,
  • Areas of AM frost, then partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday.
  • highs 57-55 warming to 64 Tuesday lows 32-35. (seasonal averages high 64 low 44)

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

  • Partly cloudy with patchy inland fog late tonight,
  • AM clouds, mostly sunny Wednesday afternoon, mostly clear in the evening, partly cloudy and colder late Wednesday night,
  • AM sun, partly cloudy and a bit cooler Thursday afternoon and at night,
  • Some AM clouds, mostly cloudy and a bit warmer with a (30%) chance of showers Friday afternoon, cloudy with a (40%) chance of showers Friday night.
  • lows 50-42 warming to 47 Friday night highs 65-62 warming to 64 Friday.
  • AM clouds, partly cloudy and a bit cooler Saturday afternoon, mostly clear and colder Saturday night,
  • Areas of AM frost, sunny and  bit cooler Sunday, mostly clear at night,
  • Areas of AM frost, sunny and a bit warmer Monday afternoon, mostly clear in the evening, partly cloudy with a slight (20%) chance of showers late Monday night,
  • Then partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday.
  • highs 62-59 warming to 65 Tuesday lows 37-42. (seasonal averages high 60 low 46).

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Forecast for the Northern Oregon Cascades including Willamette Pass:

  • Becoming mostly cloudy with a slight (20%) chance of rain late tonight,
  • Clouds and sun with a slight (20%) chance of AM rain, a mix of clouds and sun and cooler with a slight (20%) chance of rain and snow showers Wednesday afternoon, a slight (20%) chance of evening rain and snow showers, a slight (20%) chance of snow showers and colder with widespread frost late Wednesday night,
  • Partly cloudy with more widespread AM frost, becoming mostly sunny Thursday afternoon, partly cloudy at night,
  • Some AM clouds, mostly cloudy and a bit warmer with a good (50%) chance of rain and snow Friday afternoon (1 in. of snow possible), then rain likely (70%) Friday night.
  • snow level above 8,000 ft. tonight, 5,500 ft. Wednesday, 4,500 ft. Wednesday evening, free air freezing level at the surface rising to 6,000 ft. Thursday afternoon, 7,000 ft. rising to 9,000 ft. late Thursday night, snow level 7,000 ft. Friday afternoon, then above 8,000 ft. falling to 6,000 ft. late Friday night.
  • lows 35-22 warming to 28 Friday night highs 43-45.
  • Clouds and sun with a (40%) chance of AM rain and snow, a mix of clouds and sun and cooler with a slight (20%) chance of rain showers and snow showers Saturday afternoon, partly cloudy with a slight  (20%) chance of evening snow showers, just partly cloudy Saturday night,
  • Some AM clouds, just mostly sunny Sunday afternoon, mostly clear at night,
  • Mostly sunny and a bit warmer Monday, partly cloudy Monday night,
  • Then partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday.
  • snow level 4,500 ft. falling to 3,500 ft. Saturday afternoon, 2,500 ft. Saturday evening, free air freezing level 2,000 ft. rising to 4,500 ft. Sunday afternoon, 3,500 ft. falling to the surface late Sunday night, 4,500 ft. rising to 8,000 ft. Monday afternoon, 9,000 ft. rising to 10,000 ft. Monday night, then snow level 6,000 ft. rising to 8,000 ft. Tuesday.
  • highs 35-52 lows 17-26.

 

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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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