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Check out my latest Eugene Daily News Weather Or Not Column It’s 363 Miles Long, But What Is It?

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And don’t forget my latest feature story in the continuing series on service club organizations called This Moose Isn’t Named Bullwinkle.

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And my feature article about Contractors Electric called Is The Ground Wire The White One Or The Black One?

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No winner this week. Here is my weekly weather quiz question for the last time. What is “Zero Datum?” Here is the correct answer. Zero Datum: In hydrologic terms, a reference “zero” elevation for a stream or river gauge. This “zero” can be referenced (usually within ten feet of the bottom of the channel) to mean sea level, or to any other recognized datum. I’ll have a new weekly weather quiz question for you Monday. Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good luck.

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An upper level trough of low pressure (Shaded “U” shape with blue arrows) will be controlling our weather through the rest of weekend into next week. A frontal system already moved its way through the area.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 32 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 53 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 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 11 PM TODAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.

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

• Mostly cloudy with showers and a slight (20%) chance of thunderstorms with small hail possible this afternoon and evening (0.10 in. of rain possible), a (40%) chance of showers late tonight (0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM showers, good (50%) chance of showers Monday afternoon (under 0.10 in. of rain possible), showers likely (60%) in the evening, a good (50%) chance of showers late Monday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers Tuesday, then a (30%) chance of showers at night.
  highs 56-60 lows 36-40.
• Partly cloudy with a slight (20%) chance of showers Wednesday, just partly cloudy Wednesday night through Thursday night,
• A mix of clouds and sun Friday, mostly cloudy with a (30%) chance of rain at night,
• Then mostly cloudy with a good (50%) chance of rain Saturday.
• highs 62-64 cooling back to 62 Saturday lows 38-42. (seasonal averages high 59 low 39)
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Eugene-Springfield Pollen Count:

Trees: Moderate- 115

Grass: High- 0

Reading as of: 4/3/15

Data courtesy of Oregon Allergy Associates.

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Forecast for the Umpqua Basin including Roseburg:

• Mostly cloudy showers and a slight (20%) chance of thunderstorms this AM, showers with a slight (20%) chance of thunderstorms this  afternoon (0.20 in. of rain possible, small hail possible, snow level 2,500 ft.), showers likely (70%) with a slight chance of thunderstorms this evening, then a good (50%) chance of showers late tonight (0.10 in. of rain possible, small hail possible, snow level 2,500 ft.),
• A good (50%) chance of AM rain and snow showers Monday, a (40%) chance of showers in the afternoon (under 0.01 in. of rain possible, snow level 1,500 ft. rising to 2,500 ft. in the afternon), showers likely (70%) Monday night (0.15 in. of rain possible, snow level 3,500 ft.) and Tuesday (snow level 3,000 ft. rising to 3,500 ft.), a (40%) chance of showers Tuesday night.
• highs 53-58 lows 35-40.
• Mostly cloudy with a slight (20%) chance of showers Wednesday, partly cloudy Wednesday night through Friday, mostly cloudy with a slight (20%) chance of rain at night,
• Then mostly cloudy with a (40%) chance of rain Saturday.
• highs 60-68 cooling to 62 Saturday lows 38-43. (seasonal averages high 60 low 41)

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

• Mostly cloudy with showers likely (70%) and a slight (20%) chance of thunderstorms with small hail this afternoon and evening (0.30 in. of rain possible), a (40%) chance of showers showers late tonight (0.15 in. of rain possible),
• Coastal showers likely (70%) Monday AM while a good (50%) chance of AM inland showers and inland showers in the afternoon (0.20 in. of rain possible), coastal evening showers likely (60%) Monday night while inland showers at night (0.20 in. of rain possible),
• Mostly cloudy with showers likely (60%) Tuesday, then a (30%) chance of showers Tuesday night.
• highs near 55 lows 40-43.
• Partly cloudy with a slight (20%) chance of showers Wednesday, partly cloudy Wednesday night through Friday, then mostly with a (40%) chance of rain Friday night and Saturday.
• highs near 57 lows 42-46. (seasonal averages high 54 low 42)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a good (50%) chance of morning showers, showers and a slight (20%) chance of isolated afternoon and evening thunderstorms today with small hail possible (0.25 in. of rain possible, 2 in. of snow possible), rain and snow showers tonight (0.10 in. of rain possible with more in storms, 2 in. of snow possible),
• Cloudy with a slight (20%) chance of snow showers Monday AM, a  (40%) chance of showers with a slight (20%) chance of thunderstorms  in the afternoon, rain and snow showers likely (60%) in the evening, a good (50%) chance of rain and snow showers late Monday night and Tuesday AM, rain and snow showers in the afternoon, then a good (50%) chance of rain and snow showers Tuesday night.
• snow level 3,500 ft. today and tonight, 2,500 ft. Monday, 3,500 ft. Monday night and Tuesday, then 4,000 ft. Tuesday night.
• highs 39-42 lows 20-28.
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of  rain and snow showers Wednesday, just partly cloudy Wednesday night through Thursday night,
• A mix of clouds and sun Friday, mostly cloudy with a (30%) chance of rain Friday night,
• Then mostly cloudy with a good (50%) chance of rain and snow Saturday.
• snow level 4,000  ft. Wednesday, free air freezing level 6,000 ft. Wednesday night, 5,500 ft. Thursday, 7,000 ft. Thursday night and Friday, snow level 6,000 ft. Friday night, then 5,500 ft. Saturday.
• highs 45-50 cooling to 48 Saturday lows 28-32.
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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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