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Tim Chuey Weather

Check out my latest Eugene Daily News Weather Or Not column:

http://eugenedailynews.com/2018/04/it-was-their-month-in-history-but-why-didnt-we-know-about-them/

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Here is my weekly weather quiz question for the last time. What is  “Differential Motion?” Here is the correct answer. Differential Motion is cloud motion that appears to differ relative to other nearby cloud elements, e.g. clouds moving from left to right relative to other clouds in the foreground or background. Cloud rotation is one example of differential motion, but not all differential motion indicates rotation. For example, horizontal wind shear along a gust front may result in differential cloud motion without the presence of rotation. I’ll have a new weekly weather quiz question for you starting Monday. The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs. Good luck.

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An Upper Level Low Pressure Trough (Shaded “U” shape with arrows) continues to control our weather.  The graphics for days 1-3 show a front that moved through. The graphics for days 3-7 show the frontal system that moved through the Pacific Northwest. Then a frontal system moves inland from the Oregon and California coasts late next Wednesday into Thursday and the next fronts pushing in Friday night into Saturday .

 

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Air Quality Index:

Eugene/Springfield: The Air Quality Index is 9 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 8 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 4 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

  • A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 8 AM TUESDAY FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
  • A WIND ADVISORY IS IN EFFECT UNTIL 8 PM THIS EVENING FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
  • 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.

 

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

  • Cloudy with showers and a bit cooler tonight (0.25 in. of rain possible),
  • Mostly cloudy with showers and a slight (20%) chance of thunderstorms and a bit warmer Monday, (0.25 in. of rain possible, more in storms, small hail possible), cloudy with good (50%) of showers at night (0.10 in. of rain possible),
  • Mostly cloudy and a bit warmer with a good (50%) chance of showers Tuesday, a slight (20%) chance of evening showers, just mostly cloudy late Tuesday night,
  • A mix of clouds and sun with a slight (20%) chance of showers and a bit warmer Wednesday afternoon, then partly cloudy with a slight (20%) chance of showers and at night.
  • lows 40-36 highs 50-57.
  • Partly cloudy and a bit warmer Thursday and Thursday night,
  • A mix of clouds and sun Friday, becoming mostly cloudy with a slight (20%) chance of showers at night and Saturday (a bit cooler), partly cloudy at night,
  • Then a mix of clouds and sun and a bit warmer Sunday.
  • highs 60-62 cooling to 59 Sunday lows 38-40 cooling back to 38 Saturday night. (seasonal averages high 61 low 39)

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Eugene-Springfield Pollen Count

Grass………. Low (0)
Trees………. Very High (755)
Last Counted: 4/7/18
Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

  • Mostly cloudy with evening showers likely (70%), showers with snow showers likely (70%) late tonight (0.10 in. of rain possible, 1 in. of snow possible, snow level 3,000 ft. falling to 2,500 ft. late at night),
  • Mostly cloudy Monday AM with showers and with snow showers likely (70%) and a slight (20%) chance of thunderstorms, mostly cloudy and a bit cooler with showers and snow showers with a slight (20%) chance of thunderstorms Monday afternoon (0.25 in. of rain possible, snow level 2,000 ft. rising to 2,500 ft.), cloudy with evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers late Monday night (under 0.10 in. of rain possible, snow level 2,500 ft.),
  • A (30%) chance of rain and snow showers and a bit warmer Tuesday (snow level 2,500 ft.), cloudy with a slight (20%) chance of showers at night,
  • Mostly cloudy and a bit warmer with a (30%) chance of showers Wednesday, then a slight (20%) chance of showers Wednesday night.
  • lows near 40 highs 52-58.
  • Partly cloudy and a bit warmer Thursday and Thursday night,
  • Mostly cloudy and a bit warmer Friday, a slight (20%) chance of showers Friday night and Saturday (a bit cooler), just mostly cloudy at night,
  • Then partly cloudy and just a bit warmer Sunday.
  • highs 63-66 cooling to back to 63 Saturday lows 40-43 cooling back to 40 Saturday night. (seasonal averages high 62 low 42)

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

  • Cloudy with coastal showers likely (70%) and a slight (20%) chance of thunderstorms tonight while inland showers likely (70%) tonight (0.50 in. of rain possible),
  • Mostly cloudy with AM showers likely (70%) and a slight (20%) chance of thunderstorms Monday, showers with a slight (20%) chance of thunderstorms and a bit warmer in the afternoon (under 0.10 in. of rain possible), evening showers likely (70%) and a good (50%) chance of showers late Monday night,
  • Mostly cloudy with a (30%) chance of showers and a bit warmer Tuesday,  just mostly cloudy at night,
  • A (30%) chance of showers and a bit warmer Wednesday, then partly cloudy with a slight (20%) chance of showers Wednesday night.
  • lows near 42 highs 50-55.
  • Just partly cloudy and a bit warmer  Thursday and at night,
  • Mostly cloudy and a bit warmer Friday, a slight (20%) chance of showers Friday night and Saturday (a bit cooler), mostly cloudy Saturday night,
  • Then partly cloudy and a bit warmer Sunday.
  • highs 58-56 warming back to 58 Sunday lows near 42. (seasonal averages high 55 low 43)

 

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Forecast for the Cascades in Lane County:

  • Mostly cloudy with rain and snow showers and a bit colder tonight (0.25 in. of rain possible, 1-4 in. of snow possible),
  • Mostly cloudy with AM snow showers, snow showers with a slight (20%) chance of thunderstorms and a bit cooler Monday afternoon (0.50 in. of rain possible, 2-5 in. of snow possible, small hail possible), snow showers at night (2-5 in. of snow possible),
  • AM snow showers likely (70%), a bit warmer with a rain and snow showers Tuesday afternoon, a slight (20%) chance of evening rain and snow showers, a slight (20%) chance of snow showers late Tuesday night,
  • Cloudy with a (30%) chance of AM snow showers, a bit warmer Wednesday with a (40%) chance of rain and snow showers in the afternoon, mostly cloudy with a slight (20%) chance of rain and snow showers at night.
  • snow level 4,000 ft. tonight, 2,500 ft. Monday through Tuesday, then 3,000 ft. Tuesday night and Wednesday, then 4,000 ft. Wednesday night,
  • lows 27-23 warming to 26 Tuesday night cooling to 24 Wednesday night Wednesday night highs 34-39.
  • Partly cloudy and a bit warmer Thursday and Thursday night,
  • A mix of clouds and sun and a bit warmer Friday, becoming  mostly cloudy with a slight (20%) chance of showers at night,
  • A mix of clouds and sun and a bit cooler with a slight (20%) chance of rain and snow showers Saturday, just partly cloudy Saturday night,
  • Then a mix of clouds and sun and a bit warmer Sunday.
  • free air freezing level 4,000 ft. Thursday, 6,500 ft. Thursday night, 7,500 ft. Friday, snow level 6,500 ft. Friday night, 5,000 ft. Saturday, then free air freezing level 7,500 ft. Saturday night and Sunday.
  • highs 44-49 cooling to 46 Saturday warming to 52 Sunday lows 27-30 cooling back to 27 Saturday night.

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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