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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 16 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 11 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 12 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 THIS EVENING 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 evening (0.10 in. of rain possible), showers late tonight (0.10 in. of rain possible),
• Cloudy with a good (50%) chance of showers Monday (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),
• Cloudy with a good (50%) chance of showers Tuesday,  mostly cloudy with a (40%) chance of showers in the evening,
• AM clouds with a slight (20%) chance of showers AM showers, just clouds and sun Wednesday afternoon, just partly cloudy Wednesday night.
• lows 36-40 cooling back to 36 Wednesday night highs 58-62.
• Partly cloudy Thursday and Thursday night,
• A mix of clouds and sun Friday, more clouds to mostly cloudy with a (40%) chance of rain at night,
• Mostly cloudy with a (40%) chance of rain Saturday, then mostly cloudy with a (30%) chance of rain Saturday night and Sunday.
• highs 64-58 lows near 40. (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:

• Cloudy with showers and isolated thunderstorms this evening,  a good (50%) chance of showers late tonight (0.10 in. of rain possible, small hail possible, snow level 3,000 ft. falling to 2,500 ft.),
• Mostly cloudy with a (40%) 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 2,000 ft. rising to 2,500 ft. in the afternoon), showers likely (70%) Monday night (0.15 in. of rain possible, snow level 3,500 ft.),
• A (30%) chance of showers Tuesday AM, showers likely (60%) in the afternoon (snow level 3,000 ft. rising to 3,500 ft.), a (40%) chance of showers Tuesday night (snow level 3,500 ft. late at night),
• Mostly cloudy with a slight (20%) chance of showers Wednesday AM, partly cloudy in the afternoon and Wednesday night.
• lows 36-42 cooling to 38 Wednesday night highs 53-60.
• Partly cloudy Thursday through Friday, mostly cloudy with a slight (20%) chance of rain Friday night,
• Mostly cloudy with a (40%) chance of rain Saturday, a (30%) chance of showers at night,
• Then mostly cloudy with a slight (20%) chance of showers Sunday.
• highs 64-68 cooling to 62 Saturday lows 40-43 cooling back to 40 Saturday night. (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 tonight, isolated thunderstorms this evening changing to a slight (20%) of thunderstorms by late evening, (0.30 in. of rain possible, more in storms, small hail possible),
• Coastal showers likely (70%) Monday AM with showers and a slight (20%) chance of thunderstorms in the afternoon while a good (50%) chance of AM inland showers and inland showers in the afternoon (0.20 in. of rain possible), coastal evening showers and showers likely (60%) Monday night while inland showers at night (0.20 in. of rain possible),
• Cloudy with a good (50%) chance of showers, coastal showers likely (60%) Tuesday afternoon while inland afternoon showers, mostly cloudy with a (30%) chance of showers Tuesday night,
• Partly cloudy with a slight (20%) chance of showers Wednesday AM, just partly cloudy in the afternoon, then just partly cloudy Wednesday night.
• lows near 42 highs 58-55.
• Partly cloudy Friday, mostly with a (40%) chance of rain Friday night and Saturday, mostly cloudy with a (30%) chance of showers at night,
• Then cloudy with a slight (20%) chance of showers Sunday.
• highs near 57 lows 45-42. (seasonal averages high 54 low 42)

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Forecast for the Cascades in Lane County:

• Cloudy with a rain and snow showers with a slight (20%) chance of isolated evening thunderstorms with small hail possible this evening, a good (50%) chance of rain and snow showers late tonight (0.10 in. of rain possible with more in storms, 2 in. of snow possible),
• Mostly cloudy with a good (50%) chance of rain and snow showers Monday, rain and snow showers likely (70%) Monday night (0.10 in. of rain possible, 2 in. of snow possible),
• Rain and snow showers likely (60%) Tuesday, cloudy with a good (50%) chance of rain and snow showers Tuesday night,
• AM rain and snow showers, a mix of clouds and sun and a bit warmer with a slight (20%) chance of  rain and snow showers Wednesday afternoon, then just partly cloudy Wednesday night.
• snow level 3,000 ft. tonight, 3,500 ft. Monday, 4,000 ft. Monday night, 3,500 ft. Tuesday, 4,000 ft. Tuesday night and Wednesday, then free air freezing level 6,000 ft. Wednesday night.
• lows 20-28 cooling to 25 Wednesday night highs 39-45.
• Partly cloudy Thursday and Thursday night,
• A mix of clouds and sun Friday, mostly cloudy with a (40%) chance of rain Friday night,
• Mostly cloudy with a good (50%) chance of rain and snow Saturday, a (40%) chance of rain and snow at night,
• Then mostly cloudy with a (30%) chance of rain and snow Sunday.
• free air freezing level 6,000 ft. Thursday, 7,000 ft. Thursday night, free air freezing level 7,000 ft. Friday, snow level 6,500 ft. Friday night,  5,000 ft. Saturday, 4,500 ft. Saturday night, then 3,500 ft. Sunday.
• highs 50-40 lows 30-28.
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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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