Here is my weekly weather quiz question for the last time. What is the “NAO Index?”  Here is the correct answer. The NAO Index measures the anomalies in sea level pressure between the Icelandic low pressure system and the Azores high pressure system in the North Atlantic Ocean. When the NAO is in its is positive phase (+NAO), the northeastern United States sees an increase in temperature and a decrease in snow days; the central US has increased precipitation, the North Sea has an increase in storms; and Norway along with Northern Europe has warmer temperatures and increased precipitation. When the NAO is in its negative phase (-NAO), the Tropical Atlantic and Gulf coast have increased number of strong hurricanes; northern Europe is drier, and Turkey along with other Mediterranean countries has increased precipitation. 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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There will be a short break from the rain as an upper level high pressure ridge drys us out for a day. Low pressure follows close behind returning the clouds Tuesday an another frontal system follows this one that moves through tonight and falls apart. Next week another frontal system will approach the Oregon coast Wednesday followed by yet another frontal system between Thursday night and Friday to keep the rain falling.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 9 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 21 in the Good category measuring Particulate Matter.

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

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Advisories: None At This Time.

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

• Cloudy with evening rain likely (70%), patchy fog with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Patchy AM fog, a mix of clouds and sun and a bit warmer Monday afternoon, partly cloudy in the evening, becoming mostly cloudy late Monday night,
• Cloudy with a slight (20%) chance of rain Tuesday (under 0.10 in. of rain possible), a good (50%) chance of evening rain, a slight (20%) chance of rain late at night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with patchy fog Wednesday, then cloudy with a good (50%) chance of rain Wednesday night.
• lows 40-47 highs 53-56.
• Cloudy with rain Thursday and Thursday night,
• Mostly cloudy and a bit cooler with showers likely (70%) Friday, a (40%) chance of showers and a bit cooler Friday night and Saturday, then a good (50%) chance of showers Saturday night and Sunday.
• highs 55-47 lows 44-40. (seasonal averages high 48 low 35)

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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:

• Mostly cloudy with evening rain, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Mostly cloudy Monday with patchy AM fog and a slight (20%) chance of showers, breaking out to sunny and a bit warmer in the afternoon, partly cloudy in the evening, increasing clouds to mostly cloudy late Monday night,
• Mostly cloudy with a slight (20%) chance of rain Tuesday, a (30%) chance of rain at night,
• Mostly cloudy with areas of fog and a slight (20%) chance of rain Wednesday AM, becoming partly cloudy and a bit warmer in the afternoon, then mostly cloudy with a (30%) chance of rain Wednesday night.
• lows 39-49 highs 56-60.
• Mostly cloudy with rain and a bit cooler Thursday and Thursday night,
• Showers and cooler Friday, cloudy with a good (50%) chance of showers at night,
• Showers likely (60%) and cooler Saturday, then mostly cloudy with a good (50%) chance of showers Saturday night and Sunday.
• highs 59-46 lows 46-38. (seasonal averages high 51 low 37)

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

• Cloudy with evening rain, a good (50%) chance of rain late tonight (under 0.10 in. of rain possible),
• Mostly cloudy Monday with patchy AM fog and a slight (20%) chance of showers, partly cloudy at the shore while mostly sunny inland and a bit warmer in the afternoon, mostly cloudy at night with a slight (20%) chance of coastal showers Monday night,
• A (40%) chance of rain Tuesday (under o.10 in. of rain possible), partly cloudy with a slight (20%) chance of evening rain, increasing clouds to cloudy with a slight (20%) chance of rain Tuesday night (under o.10 in. of rain possible),
• Mostly cloudy with areas of fog and a slight (20%) chance of rainWednesday AM, partly cloudy in the afternoon, then mostly cloudy with a good (50%) chance of rain Wednesday night.
• lows 45-54 highs 58-60.
• Mostly cloudy and a bit cooler with rain Thursday and Thursday night,
• Showers likely (60%) and a bit cooler Friday, cloudy with a good (50%) chance of showers Friday night,
• Mostly cloudy with showers likely (60%) and a bit cooler Saturday, then mostly cloudy with a good (50%) chance of showers and a bit cooler Saturday night and Sunday.
• highs 57-48 lows 49-42. (seasonal averages high 52 low 40).

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Forecast for the Cascades in Lane County:

• Cloudy with evening rain and snow likely (70%), a good (50%) chance of rain and snow showers late tonight (0.10 in. of rain possible, 2 in. of snow possible),
• A mix of clouds and sun and warmer Monday, partly cloudy Monday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Tuesday afternoon, cloudy with a (40%) chance of evening rain, a slight (20%) chance of rain Tuesday night,
• A mix of clouds and sun and a bit warmer Wednesday, then mostly cloudy with a slight (20%) chance of rain at night.
• snow level 4,500 ft. tonight, free air freezing level 6,000 ft. Monday, 8,000 ft. Monday night, snow level 8,000 ft. Tuesday and Tuesday night, free air freezing level 9,000 ft. Wednesday, then snow level 8,000 ft. Wednesday night.
• lows 27-36 highs 38-44.
• Mostly cloudy and a bit warmer with rain Thursday and at night,
• Showers and a bit cooler Friday, cloudy with a good (50%) chance of rain and snow showers Friday night,
• Then mostly cloudy and a bit cooler with a good (50%) chance of rain and snow showers Saturday through Sunday.
• snow level 8,000 ft. Thursday, above 8,000 ft. Thursday night, 6,000 ft. Friday, 4,500 ft. Friday night, 5,000 ft. Saturday, 4,500 ft. Saturday night, then 4,000 ft. Sunday.
• highs 44-34 lows 32-27.

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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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