Here is my new weekly weather quiz question. What is  “orographic lifting?” 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 low (“Shaded “U” shape with blue arrows) will move through the Pacific giving us showers and cool temperatures for a while.  Short-lived high pressure (Shaded “Arch” shape with blue arrows on previous graphic) will move in about midweek returning some sunshine, then low pressure returns the chance of rain. A frontal system will approach the coast by Saturday increasing our rain chance even more.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 46 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 25 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 36 in the Good category measuring Particulate Matter.

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

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Advisories:

• 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 with patchy fog this AM, a mix of clouds and sun and a good (50%) chance of showers this afternoon (under 0.10 in. of rain possible), a slight (20%) chance of showers tonight (under 0.10 in. of rain possible) with patchy fog late,
• Mostly cloudy with areas of AM fog, a mix of clouds and sun and a bit cooler Wednesday afternoon, mostly cloudy with a (40%) chance of rain late at night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of rain Thursday AM, a good (50%) chance of afternoon showers (under 0.10 in. of rain possible), a slight (20%) chance of rain Thursday night.
• highs near 55 lows 36-43.
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Friday and Friday night,
• Mostly cloudy and a bit cooler with rain likely (60%) Saturday, cloudy with a (40%) chance of rain at night,
• Rain likely (60%) Sunday, showers likely (60%) Sunday night,
• Then mostly cloudy with a good (50%) chance of showers Monday.
• highs 59-54 lows 44-42. (seasonal averages high 56 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 early then chance dropping to near slight by the end of the game, 50 cooling slowly as the game progresses.

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Beavers vs UCLA at Riser Stadium- Kickoff 1:30 PM PST: Cloudy with a good (50%) chance of occasional showers, 50 warming to 55 as the game progresses, wind: S 5 mph.

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Forecast for Roseburg:

• Mostly cloudy and cooler with a (40%) chance of scattered showers today (under 0.10 in. of rain possible), a slight (20%) chance of showers tonight with patchy fog late (under 0.10 in. of rain possible),
• Mostly cloudy with patchy AM fog Wednesday, partly cloudy in the afternoon, mostly cloudy with a slight (20%) chance of rain Wednesday night and patchy fog late (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of rain Thursday AM, then mostly cloudy Thursday night.
• highs 55-58 lows 42-44.
• Just mostly cloudy and a bit warmer Friday and partly cloudy Friday night,
• Mostly cloudy and cooler with a (30%) chance of rain Saturday, a (30%) chance of showers Saturday night,
• Showers likely (60%) Sunday and at night,
• Then mostly cloudy with a good (50%) chance of showers Monday.
• highs 62-54 lows near 45. (seasonal averages high 58 low 42)

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

• Mostly cloudy with a (30%) chance of showers today (under 0.10 in. of rain possible), a (30%) chance of evening coastal showers and partly cloudy late tonight while  (30%) chance of inland showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy Wednesday AM, partly cloudy in the afternoon, mostly cloudy  with a (30%) chance of rain Wednesday night (under 0.10 in. of rain possible) and Thursday AM, then just mostly cloudy Thursday afternoon and at night.
• highs near 58 lows 45-48.
• Mostly cloudy Friday and a bit warmer, a slight (20%) chance of rain Friday night,
• Mostly cloudy and a bit cooler with a good (50%) chance of rain Saturday, a (30%) chance of showers at night,
• Mostly cloudy with showers likely (60%) Sunday and Sunday night,
• Then mostly cloudy with a good (50%) chance of showers Monday.
• highs 62-56 Sunday lows near 50. (seasonal averages high 58 low 44).

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Forecast for the Cascades in Lane County:

• Mostly cloudy and cooler with a good (50%) chance of rain and snow showers this AM, rain and snow showers likely (70%) and a bit cooler this afternoon (0.10 in. of rain possible, 1 in. of snow possible), a (40%) chance of rain and snow showers this evening, a slight (20%) chance of rain and snow showers late tonight (under 0.10 in. of rain possible),
• Just partly cloudy and warmer Wednesday and in the evening, mostly cloudy with a slight (20%) chance  of rain and snow late at night,
• Mostly cloudy and a bit warmer with a good (50%) chance of rain and snow Thursday AM, a slight (20%) chance of rain and snow showers in the evening, then a slight (20%) chance of rain and snow Thursday night.
• snow level 3,500 ft. today, 4,000 ft. tonight, free air freezing level 4,500 ft Wednesday, snow level 4,500 ft. Wednesday night and Thursday, then 5,500 ft. Thursday night.
• highs 36-42 lows 24-30.
• A mix of clouds and sun and warmer Friday, mostly cloudy Friday night,
• Mostly cloudy with a good (50%) chance of rain Saturday and at night,
• Rain likely (60%) Sunday, rain and snow showers likely (70%) Sunday night,
• Then mostly cloudy with a good (50%) chance of rain and snow showers Monday.
• free air freezing level 9,000 ft. Friday, 10,000 ft. Friday night, snow level above 8,000 ft. Saturday, 7,500 ft. Saturday night, 6,000 ft. Sunday, 5,500 ft. Sunday night, then 4,000 ft. Monday.
• highs 47-40 lows 34-29.

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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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