Here is my 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) is moving in behind that high which gave us some sunshine today. A frontal system will be pushed into Oregon between tonight and Saturday ushering in more rain. It looks like you could get wet at either of the home football games Saturday whether you are in Autzen Stadium or Reser Stadium. About midweek look for another frontal system will drop down from the northwest bringing colder air with it.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 35 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 23 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 2 AM UNTIL 9 AM SATURDAY 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 tonight,
• Mostly cloudy with a slight (20%) chance of rain Saturday AM, rain in the afternoon (0.25 in. of rain possible) and Saturday night (0.25 in. of rain possible),
• Mostly cloudy and a bit cooler with showers Sunday (0.20 in. of rain possible), a good (50%) chance of evening showers, showers likely (70%) late Sunday night (0.15 in. of rain possible),
• A bit cooler with a good (50%) chance of showers Monday, then partly cloudy with slight (20%) chance of showers at night.
• lows 42-45 cooling to 38 Monday night highs 57-52.
• A mix of clouds and sun Tuesday, mostly cloudy with a good (50%) chance of rain Tuesday night,
• Mostly cloudy and just a bit warmer with rain likely (60%) Wednesday (Veterans Day), a good (50%) chance of rain at night,
• Mostly cloudy with a (40%) chance of rain Thursday, a good (50%) chance of rain Thursday night,
• Then rain likely (60%) Friday.
• highs 53-50 lows 39-42. (seasonal averages high 55 low 39)

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Your Saturday College Football Forecast:

Ducks vs California at Autzen Stadium– Kickoff 7:30 PM PST: Mostly cloudy with rain 55 cooling slowly as the game progresses, wind S 5-15 mph.

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Beavers vs UCLA at Riser Stadium- Kickoff 1:30 PM PST: Mostly cloudy with rain likely, 54 warming to 58 as the game progresses, then cooling, wind S 5-15 mph gusts to 25 mph.

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Forecast for Roseburg:

• Mostly clear tonight,
• Mostly cloudy with a good (50%) chance of rain Saturday AM, rain in the afternoon (0.20 in. of rain possible) and Saturday night (0.50 in. of rain possible).
• Showers likely (60%) Sunday AM, showers and co0ler in the afternoon (0.30 in. of rain possible), a good (50%) chance of late Sunday night (0.20 in. of rain possible),
• Cloudy and a bit cooler with a good (50%) chance of showers Monday, partly cloudy with a slight (20%) chance of evening showers, then just partly cloudy Monday night.
• lows 42-46 cooling to 39 Monday night highs 58-54.
• Mostly cloudy Tuesday AM, partly cloudy in the afternoon, partly cloudy with a slight (20%) chance of rain Tuesday night,
• Mostly cloudy with rain likely (60%) Wednesday (Veterans Day) and Wednesday night,
• Mostly cloudy with a (30%) chance of showers Thursday and Thursday night,
• Then cloudy with a (40%) chance of rain Friday.
• highs near 54 lows 39-44. (seasonal averages high 57 low 42)

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

• Mostly clear tonight,
• Mostly cloudy with a (40%) chance of AM rain, rain and a bit cooler Saturday afternoon (0.30 in. of rain possible) and Saturday night (0.50 in. of rain possible),
• Coastal showers Sunday AM with showers and cooler with a slight (20%) chance of thunderstorms in the afternoon (0.30 in. of rain possible) and evening then showers likely (70%) with a slight (20%) chance of thunderstorms late Sunday night while AM inland showers likely (70%) with showers in the afternoon and inland showers likely (70%) Sunday night (0.30 in. of rain possible),
• Mostly cloudy with showers likely (70%) and a slight (20%) chance of thunderstorms Monday AM, a bit warmer with a good (50%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon, partly cloudy with a slight (20%) chance of evening showers, then clearing to mostly clear late Monday night.
• lows 48-40 highs 58-54 warming to 56 Monday.
• Mostly cloudy Tuesday, mostly cloudy with a slight (20%) chance of rain Tuesday night,
• Mostly cloudy with rain Wednesday (Veterans Day), rain likely (70%) at night,
• Mostly cloudy with a good (50%) chance of showers Thursday and Thursday night,
• Then rain likely (60%) and a bit warmer Friday.
• highs 56-59 lows 45-50. (seasonal averages high 57 low 44).

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Forecast for the Cascades in Lane County:

• Partly cloudy tonight,
• A mix of clouds and sun Saturday AM, becoming mostly cloudy with rain likely (60%) in the afternoon, rain in the evening, rain and snow late at night (0.25 in. of rain possible),
• Mostly cloudy and colder with rain and showers Sunday, cloudy with rain and snow showers likely (70%) in the evening, a good (50%) chance of rain and snow showers late Sunday night,
• Cloudy and a bit cooler with a good (50%) chance of rain and snow showers  Monday, then partly cloudy with a (30%) chance of rain and snow showers Monday night.
• free air freezing level 9,000 ft. tonight, snow level 7,500 ft. Saturday, 7,000 ft. falling to 6,000 ft. late Saturday night, 4,500 ft Sunday, then 3,500 ft. Sunday night through Monday night.
• lows 32-20 highs 50-35.
• A mix of clouds and sun Tuesday, partly cloudy with a slight (20%) chance of rain and snow at night,
• A mix of clouds and sun and warmer with a good (50%) chance of rain and snow showers Wednesday (Veterans Day), mostly cloudy with a good (50%) chance of rain and snow Wednesday night,
• A (30%) chance of rain and snow Thursday, a good (50%) chance of rain and snow at night,
• Then mostly cloudy with rain and snow likely (60%) Friday.
• free air freezing level 4,000 ft. Tuesday and Tuesday night, 5,000 ft. Wednesday, 4,000 ft. Wednesday night and Thursday, 4,500 ft. Thursday night, then 5,000 ft. Friday.
• highs 37-40 cooling to 37 Thursday warming to 40 Friday lows 24-27.

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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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