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) moved through the Pacific giving us showers and cool temperatures.  Short-lived high pressure (Shaded “Arch” shape with blue arrows on previous graphic) moves in for today, then low pressure returns the chance of rain by nightfall. 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 68 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 34 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 43 in the Good category measuring Particulate Matter.

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

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Advisories:

• A FROST ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL 8 AM THURSDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A HEALTH ADVISORY HAS BEEN LIFTED FOR THE CLACKAMAS COVE PORTION OF THE CLACKAMAS  RIVER IN CLACKAMAS COUNTY. WATER MONITORING TESTS PROVIDED BY THE USGS HAVE CONFIRMED THAT THE BLUE-GREEN ALGAE TOXINS ARE NO LONGER PRESENT.
• 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:

• Partly cloudy this evening, mostly cloudy with rain likely (70%) late tonight (0.10 in. of rain possible),
• Cloudy with AM rain likely (70%), a bit warmer and a (40%) chance of afternoon showers (under 0.10 in. of rain possible), just mostly cloudy Thursday night,
• Partly cloudy and warmer Friday, becoming mostly cloudy with a slight (20%) chance of rain Friday night,
• Cloudy and a bit cooler with a (40%) chance of rain Saturday AM, rain in the afternoon and evening, then a good (50%) chance of showers late Saturday night.
• lows 42-46 highs 56-60 cooling to 58 Saturday.
• Cloudy and a bit cooler with a good (50%) chance of rain Sunday, rain likely (60%) Sunday night,
• A mix of clouds and sun with a good (50%) chance of showers Monday, a slight (20%) chance of showers at night,
• A mix of clouds and sun Tuesday, mostly cloudy Tuesday night,
• Then a mix of clouds and sun and just a bit warmer with a slight (20%) chance of rain Wednesday (Veterans Day).
• highs 52-54 lows 42-40. (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: Mostly cloudy with rain 54 cooling slowly as the game progresses.

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Beavers vs UCLA at Riser Stadium- Kickoff 1:30 PM PST: Mostly cloudy with rain, 52 warming to 58 as the game progresses, then cooling.

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Forecast for Roseburg:

• Mostly cloudy with showers and patchy fog tonight and Thursday AM, cloudy with a good (50%) chance of showers in the afternoon (under 0.10 in. of rain possible), mostly cloudy with patchy fog again late Thursday night,
• Patchy AM fog,  partly cloudy and a bit warmer Friday and Friday night,
• Mostly cloudy with a good (50%) chance of AM rain, then rain and a bit warmer Saturday afternoon and Saturday night.
• lows 43-40 warming to 47 Sunday night highs 58-64.
• Cloudy and cooler with a (40%) chance of rain Sunday, rain likely (60%) at night,
• Cloudy and a bit cooler with a good (50%) chance of showers Monday, partly cloudy with a slight (20%) chance of showers Monday night,
• Just mostly cloudy Tuesday, then partly cloudy Tuesday night and Wednesday (Veterans Day).
• highs 56-52 warming to 54 Wednesday lows 42-40. (seasonal averages high 57 low 42)

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

• Mostly cloudy with coastal showers likely (70%) late tonight (under 0.10 in. of rain possible) and Thursday AM while a good (50%) chance of inland showers tonight,
• Cloudy with a good (50%) chance of showers Thursday (under 0.10 in. of rain possible), mostly cloudy with patchy fog late at night,
• Patchy AM fog, partly cloudy Friday and in the evening, mostly cloudy with a slight (20%) chance of coastal showers Friday night,
• Then mostly cloudy and a bit cooler with rain Saturday and Saturday night.
• lows near 48 highs 58-62.
• Mostly cloudy with rain likely (70%) and a bit cooler Sunday and Sunday night,
• Cloudy with a good (50%) chance of showers Monday, partly cloudy with a slight (20%) chance of showers Monday night,
• Just partly cloudy Tuesday and Tuesday night,
• Then mostly cloudy with a slight (20%) chance of rainWednesday (Veterans Day).
• highs 62-58 lows 50-44. (seasonal averages high 57 low 44).

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Forecast for the Cascades in Lane County:

• Partly cloudy this evening, mostly cloudy with a good (50%) chance of rain and snow late tonight,
• Cloudy with rain and snow likely (60%) Thursday AM,  a bit cooler with a good (50%) chance of rain and snow in the afternoon, mostly cloudy with a slight (20%) chance of evening rain, partly cloudy late Thursday night and Friday (a bit warmer), partly cloudy Friday night,
• Mostly cloudy with a good (50%) chance of rain Saturday, rain in the evening, a good (50%) chance of showers at night.
• snow level 4,500 ft. tonight and Thursday, 5,000 ft. Thursday night, free air freezing level 6,500 ft. Friday, 9,000 ft. Friday night, snow level 8,000 ft. Saturday, then 6,500 ft. Saturday night.
• lows 28-35 highs 40-50.
• Mostly cloudy and cooler with a rain and snow likely (70%) Sunday and Sunday night,
• Mostly cloudy and a bit cooler with a good (50%) chance of rain and snow showers Monday, a (30%) chance of rain and snow showers Monday night,
• A mix of clouds and sun Tuesday, then partly cloudy Tuesday night and (warmer) Wednesday (Veterans Day).
• snow level 5,000 ft. Sunday, 3,500 ft. Sunday night, 3,500 ft. Monday and Monday night, free air freezing level 4,500 ft. Tuesday and Tuesday night, then 5,000 ft. Wednesday.
• highs 36-42 lows 27-22.

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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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