Here is my weekly weather quiz question for the last time. What is an “okta?” Here is the correct answer. Okta is used for the measurement of total cloud cover. One okta of cloud cover is the equivalent of 1/8 of the sky covered with cloud. 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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The jet stream brought a lot of marine moisture straight to us. Now an upper level low (“Shaded “U” shape with blue arrows) returns will keep the rain around for a while.  A frontal system moved through the Pacific Northwest spreading wind and rain with the heaviest to the north. Another frontal system will approach the coast by next Saturday.

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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 12 in the Good category measuring Particulate Matter.

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

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Advisories:

• A WIND ADVISORY IS IN EFFECT UNTIL 4 AM TODAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, CENTRAL, WESTERN AND EASTERN LAKE COUNTIES.
• A HEALTH ADVISORY CONTINUES FOR THE CLACKAMAS COVE PORTION OF THE CLACKAMAS  RIVER IN CLACKAMAS COUNTY. WATER MONITORING BY THE USGS HAS CONFIRMED THE PRESENCE OF BLUE-GREEN ALGAE TOXINS WHICH CAN BE HARMFUL TO HUMANS AND ANIMALS. SWALLOWING, INHALING OR SKIN CONTACT WITH WATER DROPLETS SHOULD BE AVOIDED.
• A HEALTH ADVISORY CONTINUES FOR SUNSET BAY STATE PARK BEACH LOCATED IN COOS COUNTY FOR HIGHER-THAN-NORMAL FECAL BACTERIA WHICH CAN RESULT IN DIARRHEA, STOMACH CRAMPS, SKIN RASHES, UPPER RESPIRATORY INFECTIONS AND OTHER ILLNESSES. DIRECT CONTACT WITH THE WATER – ESPECIALLY BY CHILDREN AND THE ELDERLY, WHO MAY BE VULNERABLE TO WATERBORNE BACTERIA – SHOULD BE AVOIDED IN THIS AREA UNTIL THE ADVISORY IS LIFTED. VISITORS SHOULD AVOID WADING IN NEARBY CREEKS, POOLS OF WATER ON THE BEACH, OR IN DISCOLORED WATER AND STAY CLEAR OF WATER RUNOFF FLOWING INTO THE OCEAN.

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

• Mostly cloudy and cooler with showers today (0.25 in. of rain possible) and tonight (0.15 in. of rain possible),
• A bit cooler with a good (50%) chance of showers Monday (0.10 in. of rain possible) through Tuesday, then a slight (20%) chance of showers Tuesday night.
• highs 60-54 lows 44-38.
• Partly cloudy with patchy AM and late night fog Wednesday and at night,
• Areas of AM fog, a mix of clouds and sun and a bit cooler Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain Friday, mostly cloudy with a (40%) chance of rain at night,
• Then cloudy with a good (50%) chance of rain Saturday.
• highs 54-56 lows 36-42. (seasonal averages high 57 low 39)

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Your Saturday College Football Forecast:

Preliminary forecasts:

Ducks vs California at Autzen Stadium– Kickoff 7:30 PM PST: Cloudy with a good (50%) chance of rain.

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Beavers vs UCLA at Riser Stadium- Kickoff 1:30 PM PST: Cloudy with a good (50%) chance of rain.

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Forecast for Roseburg:

• Mostly cloudy and cooler with AM showers, showers and a slight (20%) chance of thunderstorms this afternoon (0.10 in. of rain possible), evening showers, showers and a slight (20%) chance of thunderstorms and colder late tonight (0.15 in. of rain possible),
• Showers likely (70%) with a slight (20%) chance of thunderstorms Monday AM, showers likely (70%) and a bit cooler in the afternoon (0.10 in. of rain possible), a good (50%) chance of showers Monday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers Tuesday, then a slight (20%) chance of showers at night.
• highs 62-56 lows 46-38.
• Partly cloudy Wednesday, partly cloudy with areas of fog late Wednesday night and Thursday AM, mostly cloudy in the afternoon and late at night with areas of fog,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Friday, mostly cloudy Friday night,
• Cloudy with a (30%) chance of rain Saturday.
• highs 57-62 cooling to 59 lows near 38-42. (seasonal averages high 59 low 42)

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

• Mostly cloudy with showers this AM, showers and cooler with a slight (20%) chance of thunderstorms this afternoon and evening (0.15 in. of rain possible), showers late tonight,
• Showers likely (70%) and a slight (20%) chance of thunderstorms Monday AM, showers likely (60%) in the afternoon (0.15 in. of rain possible), a (40%) chance of showers Monday night,
• Mostly cloudy with a good (50%) chance of showers Tuesday, then a slight (20%) chance of showers at night.
• highs 59-57 lows 50-43.
• Just partly cloudy Wednesday, partly cloudy with areas of fog late Wednesday night,
• Areas of AM fog, mostly cloudy and a bit cooler Thursday, mostly cloudy with patchy fog late at night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Friday and Friday night,
• Then cloudy and a bit cooler with a good (50%) chance of rain Saturday.
• highs 57-62 cooling to 58 Saturday lows 45-47. (seasonal averages high 58 low 45).

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Forecast for the Cascades in Lane County:

• Mostly cloudy and cooler with showers and breezy (Wind: SW 10-20 mph gusts to 40 mph) today and this evening (0.50 in. of rain possible), rain and snow showers and colder tonight (0.25 in. of rain possible, 1-3 in. of snow possible),
• Mostly cloudy and cooler with rain and snow showers and a bit cooler Monday,  a good (50%) chance of rain and snow showers Monday night and Tuesday, then a (40%) chance of rain and snow showers Tuesday night.
• snow level 6,000 ft. today, 5,000 ft. tonight, 4,500 ft. Monday and Monday night, 4,000 ft. Tuesday, then free air freezing level 4,000 ft. Tuesday night.
• highs 43-36 lows 30-23.
• Partly cloudy and warmer Wednesday and at night,
• A mix of clouds and sun and a bit warmer Thursday, mostly cloudy with a slight (20%) chance of rain and snow Thursday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain and snow Friday, partly cloudy with a slight (20%) chance of rain at night,
• Then mostly cloudy with a good (50%) chance of rain Saturday.
• free air freezing level 4,500 ft. Wednesday, 5,500 ft. Wednesday night and Thursday, snow level 5,000 ft. Thursday night, 5,500 ft. Friday, 7,500 ft. Friday night, then 7,000 ft. Saturday.
• highs near 39-45 lows 25-32.

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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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