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Check out my latest Eugene Daily News Weather Or Not Column Does It Fall From The Sky? Hail Yes It Does.

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And don’t forget my latest feature story in the continuing series on service club organizations called Truly Altrusa.
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No winner. Here is my weekly weather quiz question for the last time. Define the term “inversion.” Here is the correct answer. Inversion (abbrev. INVRN) Generally, a departure from the usual increase or decrease in an atmospheric property with altitude. Specifically it almost always refers to a temperature inversion, i.e., an increase in temperature with height, or to the layer within which such an increase occurs. An inversion is present in the lower part of a cap. I’ll have a new weekly weather quiz question for you starting 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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Upper level Low Pressure (Shaded “U” shape with blue arrows) has replaced the high pressure returning the much cooler onshore airflow. The low will keep us in clouds sending disturbances our way until a High Pressure Ridge (Shaded “Arch” shape with blue arrows) takes over for Wednesday and Thursday.

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Advisories: None at this time.

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Air Quality Index: Eugene-Springfield: The Air Quality Index is 23 in the Good category measuring Ozone at Delight Valley School, Saginaw. Data courtesy of Lane Regional Air Protection Agency (LRAPA)

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter at Willamette Activity Center, Oakridge. Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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Eugene-Springfield Pollen Count:

Grass……….Moderate (8)

Trees……….High (183)

Last Counted: 5/2/14

Data Courtesy of Oregon Allergy Associates.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly cloudy with some sun breaks and showers today (0.25 in. of rain possible), showers tonight (0.10 in. of rain possible),
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms Monday afternoon and evening (0.10 in. of rain possible), a good (50%) chance of showers late Monday night,
• Mostly cloudy with a good (50%) chance of showers Tuesday, partly cloudy with a slight (20%) chance of showers in the evening, partly cloudy at night.
• highs 59-62 lows 49-40.
• A mix of clouds and sun Wednesday, partly cloudy at night,
• Becoming mostly cloudy Thursday, then a good (50%) chance of rain Thursday night through Saturday.
• highs 63-66 lows 42-46. (seasonal averages high 65 low 42).

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Forecast for the Umpqua Basin including Roseburg:

• Mostly cloudy with AM rain, showers this afternoon (0.15 in. of rain possible), evening showers likely (70%), showers late tonight (0.15 in. of rain possible),
• AM showers, showers and a slight (20%) chance of thunderstorms Monday afternoon and evening, mostly cloudy with a (40%) chance of showers late Monday night,
• Mostly cloudy with a (30%) chance of showers Tuesday, a slight (20%) chance of showers in the evening, just mostly cloudy at night.
• highs 63-60 warming back to 63 Tuesday lows 45-40.
• Mostly cloudy Wednesday and Wednesday night,
• A slight (20%) chance of showers Thursday, mostly cloudy with a (40%) chance of showers Thursday night and Friday, a (40%) chance of rain Friday night,
• Then mostly cloudy with a (30%) chance of rain Saturday.
• highs 68-72 cooling to near 70 Saturday lows 44-48. (seasonal averages high 67 low 45)

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

• Rain this AM, showers this afternoon (0.20 in. of rain possible) and breezy (Wind: SW 10-20 mph increasing to 20-25 mph late afternoon, showers tonight (0.20 in. of rain possible),
• Mostly cloudy with coastal showers Monday while AM showers inland and showers with a slight (20%) chance of thunderstorms in the afternoon (0.20 in. of rain possible), a (30%) chance of coastal showers Monday night while a (40%) chance of inland showers and a slight (20%) chance of thunderstorms in the evening, a (40%) chance of showers late at night (0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers Tuesday, a slight (20%) chance of showers in the evening then just mostly cloudy at night.
• highs near 58 lows 49-45.
• Mostly cloudy Wednesday and Wednesday night,
• A slight (20%) chance of showers Thursday, mostly cloudy with a (40%) chance of rain Thursday night and Friday, a (40%) chance of showers at night,
• Then mostly cloudy with a (40%) chance of rain Saturday.
• highs 59-65 lows 47-50. (seasonal averages high 58 low 45).

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Forecast for the Cascades in Lane County:

• Rain and snow showers (0.50 in. of rain possible, 1-4 in. of snow possible) today and breezy (Wind: SW 15-25 mph gusts to 40 mph), rain and snow showers tonight (0.25 in. of rain possible, 1-4 in. of snow possible),
• AM rain and snow showers, rain and snow showers with a slight (20%) chance of thunderstorms Monday afternoon (0.25 in. of rain possible, 1-4 in. of snow possible), cloudy with rain and snow showers likely (60%) and a slight (20%) chance of thunderstorms in the evening, a good (50%) chance of rain and snow showers late Monday night,
• Mostly cloudy with a good (50%) chance of rain and snow showers Tuesday, partly cloudy with a (40%) chance of evening rain and snow showers, then a slight (20%) chance of rain and snow showers late at night.
• snow level 5,000 ft. today through Monday night, 4,500 ft. Tuesday, then 5,500 ft. at night.
• highs 44-42 lows 35-30.
• A mix of clouds and sun Wednesday and Thursday, partly cloudy Wednesday night, mostly cloudy with a good (50%) chance of rain Thursday night,
• Then mostly cloudy with a good (50%) chance of rain Friday through Saturday.
• free air freezing level 6,000 ft. Wednesday, 7,500 ft. at night, 8,000 ft. Thursday, snow level 7,500 ft. at night, 6,500 ft. Friday, 6,000 ft. at night, then 6,500 ft. Saturday.
• highs 49-54 cooling to near 50 Saturday lows 30-33.

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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 Eugene Daily News.com.

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