Here is my weekly weather quiz question for the last time. What is “ Attenuation?” Here is the correct answer. Attenuation refers to the reduction of the radar beam power due to the reflection or absorption of energy when it strikes a target. The greatest attenuation occurs when the radar beam goes through very heavy rain. 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 High Pressure Ridge (Shaded “Arch” shape with blue arrows) took over warming us up. The graphics for days 1-3 shows the surface front that’s moving through the Pacific Northwest for today. The graphics for days 3-7 show more fronts that will push into our area Wednesday and Friday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 1 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Home Wood Heating Advisory:

Eugene-Springfield: GREEN – Burning is Allowed.

Oakridge: GREEN – Burning is Allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• Permanent Health Advisory remains in effect for the South Umpqua River and Lawson 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:

• Partly cloudy and colder with patchy fog tonight and Monday AM, mostly cloudy and a bit cooler with a good (50%) chance of showers in the afternoon (under 0.10 in. of rain possible), a (40%) chance of evening showers, a slight (20%) chance of showers late Monday night (under 0.10 in. of rain possible),
• Partly cloudy with a slight (20%) chance of rain and a bit warmer Tuesday afternoon and evening (under 0.10 in. of rain possible), just mostly cloudy late at night,
• Partly cloudy  in the AM, mostly sunny and a bit warmer Wednesday afternoon, then clear Wednesday night.
• lows 37-52 highs 59-79.
• Partly cloudy with a slight (20%) chance of showers Thursday afternoon, mostly cloudy with a (30%) chance of showers Thursday night,
• Partly cloudy with a (30%) chance of showers and much cooler Friday, mostly cloudy with a slight (20%)  chance of showers at night,
• Partly cloudy with a (30%) chance of showers Saturday, mostly cloudy with a (40%) chance of showers Saturday night,
• Then a mix of clouds and sun with a slight (20%) chance of showers Sunday.
• highs 78-60 lows 52-40 warming to 42 Saturday night. (seasonal averages high 64 low 41)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (5)

Trees………. High (110)

Last Counted: 4/26/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Partly cloudy tonight,
• Mostly cloudy and a bit warmer with a (30%) chance of rain Monday afternoon (under 0.10 in. of rain possible) a (30%) chance of showers Monday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Tuesday AM, just mostly cloudy and a bit warmer in the afternoon and at night,
• Sunny and a bit warmer Wednesday, then clear Wednesday night.
• lows 42-56 highs 67-84.
• Partly cloudy and a bit cooler with a (30%) chance of showers and a slight (20%) chance of thunderstorms Thursday afternoon, mostly cloudy with a (30%) chance of showers and a slight (20%) chance of thunderstorms in the evening, a (30%) chance of showers at night,
• Mostly cloudy with a (30%) chance of showers and a bit cooler Friday through Saturday, then mostly cloudy with a slight (20%) chance of showers Saturday night and Sunday.
• highs 77-62 lows 52-42. (seasonal averages high 66 low 44)

 

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

• Partly cloudy this evening, mostly cloudy late tonight,
• Mostly cloudy and a bit warmer with a good (50%) chance of rain Monday afternoon (under 0.10 in. of rain possible), a (40%) chance of showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM showers (under 0.10 in. of rain possible), just mostly cloudy and a bit warmer Tuesday afternoon and Tuesday night,
• Sunny and a bit warmer Wednesday, then clear at night.
• lows 44-54 highs 58-70.
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Thursday afternoon and Thursday night,
• Mostly cloudy and a bit cooler with a (40%) chance of showers Friday through Saturday, then mostly cloudy with a slight (20%) chance of showers Saturday night and Sunday.
• highs 62-57 lows 50-46. (seasonal averages high 57 low 45)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late tonight,
• Mostly cloudy Monday and a bit warmer with a good (50%) chance of showers in the afternoon (under 0.10 in. of rain possible), a good (50%) chance of showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of AM, a bit warmer with a slight (20%) chance of showers Tuesday afternoon, a slight (20%) chance of evening rain, just mostly cloudy Tuesday night,
• A mix of clouds and sun in the AM, mostly sunny and a bit warmer Wednesday afternoon, then mostly clear at night.
• snow level 5,500 ft. tonight, 6.000 ft. Monday, 8,000 ft. Monday night, 8,000 ft. rising to above 8,000 ft. Tuesday afternoon and Tuesday night, free air freezing level 12,000 ft. rising to 13,000 ft. Wednesday night, then 13,000 ft. Wednesday night.
• lows 26-46 highs 49-69.
• A mix of clouds and sun with a (40%) chance of showers and a slight (20%) chance of thunderstorms Thursday afternoon, mostly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the evening, a (40%) chance of showers late Thursday night,
• A mix of clouds and sun with a good (50%) chance of showers and much cooler Friday, mostly cloudy with a (40%) chance of showers Friday night,
• A mix of clouds and sun with a (40%) chance of rain and snow showers and a bit cooler Saturday, mostly cloudy with a good (50%) chance of rain and snow showers at night,
• Then a mix of clouds and sun and a bit warmer with a slight (20%) chance of rain and snow showers Sunday.
• snow level above 8,000 ft.  Thursday and Thursday night, 7,000 ft. Friday, 6,000 ft. Friday night, 5,500 ft. Saturday, and Saturday night, then 5,000 ft. Sunday.
• highs 69-46 warming to 48 Saturday lows 43-30.

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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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