Here is my weekly weather quiz question. What is a “Ribbon Lightning?” 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 high pressure ridge (Shaded “Arch” shape with blue arrows) will slowly weaken, tilt to the northwest and move eastward allowing an upper level low (Shaded “U” shape with blue arrows) to move toward the Pacific Northwest. A parade of frontal systems push through increasing rain chances and possibly producing thunderstorms.  Another frontal system heads our way Saturday. By Monday we’ll have yet another frontal system pushing through the Pacific Northwest. Continuing the trend yet another frontal system approaches from the Southwest by Tuesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 6 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A HIGH SURF ADVISORY IS IN EFFECT FROM 5 AM UNTIL 5 PM THURSDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.

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Eugene-Springfield Pollen Count:

Grass………. Moderate (9)

Trees………. Very High (535)

Last Counted: 4/12/16

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 scattered showers tonight (0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM showers, a good (50%) chance of showers Wednesday afternoon (0.10 in. of rain possible), evening rain, showers late Wednesday night (0.50 in. of rain possible),
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms and a bit cooler Thursday afternoon (0.35 in. of rain possible), evening showers likely (70%), a slight (20%) chance of showers late Thursday night (under 0.10 in. of rain possible),
• AM clouds with a slight (20%) chance of showers, a mix of clouds and sun with a slight (20%) chance of showers and a bit warmer Friday afternoon, then just mostly cloudy Friday night.
• lows 45-40 highs 62-56 warming to 60 Friday.
• AM clouds, mostly sunny and a bit warmer Saturday, Sunday and Monday, partly cloudy Saturday night and Sunday night, mostly cloudy with a slight (20%) chance of showers Monday night,
• Then a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Tuesday.
• highs 66-75 cooling back to 66 Tuesday lows 44-48 cooling back to 44 Monday night. (seasonal averages high 60 low 39).

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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.

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA).

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Forecast for Roseburg:

• Cloudy with a good (50%) chance of scattered showers tonight (0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers and a bit cooler Wednesday (under 0.10 in. of rain possible), evening rain, showers (0.25 in. of rain possible, more in storms) and a slight (20%) chance of thunderstorms late Wednesday night (snow level 3,000 ft. late at night),
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms and a bit cooler Thursday, a good (50%) chance of showers late at night (snow level 3,500 ft. late at night),
• Mostly cloudy with a slight (20%) chance of showers Friday AM, then just mostly cloudy and a bit warmer in the afternoon and Friday night.
• lows 44-40 warming back to 44 Friday night highs 65-55 warming back to 65 Friday.
• Partly cloudy and a bit warmer Saturday through Sunday night,
• Partly cloudy with a slight (20%) chance of rain and a bit cooler Monday, then partly cloudy with a slight (20%) chance of showers and a bit cooler Monday night and Tuesday.
• highs 76-86 cooling back to 76 Monday night lows 47-50 cooling back to 47 Monday 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 showers this evening, a (40%) of showers late tonight (0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Wednesday AM, a (30%) chance of afternoon rain and breezy (Wind: S 10-15 mph increasing to S 15-25 mph by late afternoon), evening rain (0.15 in. of rain possible), showers and a slight (20%) chance of thunderstorms (0.70 in. of rain possible, more in storms) and windy Wednesday night (Wind: S 25-25 mph decreasing to S 20-30 mph by late evening at the shore while S 15-25 mph),
• Mostly cloudy and a bit cooler with showers and a slight (20%) chance of thunderstorms Thursday and breezy (Wind: SW 15-25 mph decreasing and shifting to W 10-15 mph in the afternoon), a good (50%) chance of showers Thursday night,
• Mostly cloudy with a slight (20%) chance of AM showers, just mostly cloudy and a bit warmer Friday and at night
• lows 46-43 warming to 46 Friday night highs 59-55 warming back to 59 Friday.
• Partly cloudy and a bit warmer Saturday through Sunday, partly cloudy Saturday night, mostly cloudy Sunday night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Monday, then partly cloudy with a slight (20%) chance of showers Monday night and Tuesday.
• highs 66-72 cooling to 63 Monday and Tuesday lows near 50. (seasonal averages high 55 low 43).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with showers a good (50%) chance of scattered showers tonight decreasing to a (30%) chance of showers late (0.25 in. of rain possible),
• Mostly cloudy with a (40%) chance of rain and snow showers and a bit cooler Wednesday, rain or snow in the evening, showers late Wednesday night (0.50 in. of rain possible),
• Mostly cloudy with rain and snow showers and a bit cooler Thursday and Thursday night, a (40%) chance of showers late at night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Friday, then just partly cloudy Friday night.
• snow level 5,000 ft. tonight, 4,500 ft. Wednesday, 4,000 ft. Wednesday night, 3,500 ft. Thursday, 3,500 ft. Thursday night, 4,000 ft. Friday, then free air freezing level 6,500 ft. Friday night..
• lows 32-27 warming to 29 Friday night highs 48-37 warming to 44 Friday.
• Mostly sunny and warmer Saturday and Sunday, partly cloudy both nights,
• More clouds to mostly cloudy and a bit cooler with a slight (20%) chance of rain Monday, a slight (20%) chance of showers at night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of showers Tuesday.
• free air freezing level 7,500 ft. Saturday, 9,000 ft. Saturday night, 10,000 ft. Sunday and Sunday night, snow level above 8,000 ft. Monday and Monday night, then 7,000 ft. Tuesday.
• highs 55-62 cooling back to 55 Tuesday lows 37-42.

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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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