Here is my weekly weather quiz question for the last time. What is  “orographic lifting?” Here is the correct answer. Orographic Lifting is the same as Upslope Flow; it occurs when air is forced to rise and cool due to terrain features such as hills or mountains. If the cooling is sufficient, water vapor condenses into clouds. Additional cooling results in rain or snow. It can cause extensive cloudiness and increased amounts of precipitation in higher terrain. 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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An upper level low (Shaded “U” shape with blue arrows) has moved in keeping us in clouds and rain. About midweek look for another frontal system to drop down from the northwest bringing even more rain with it.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

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

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Advisories:

• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• 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:

• Cloudy this evening, a good (50%) chance of showers late tonight (0.10 in. of rain possible),
• Patchy AM fog, mostly cloudy with a (40%) chance of showers Monday (under 0.10 in. of rain possible), partly cloudy with slight (20%) chance of evening showers, just partly cloudy with patchy fog late at night,
• Patchy AM fog, a mix of clouds and sun with a slight (20%) chance of rain Tuesday afternoon, cloudy with a (40%) chance of rain in the evening, rain likely (70%) late Tuesday night,
• Mostly cloudy with AM rain Wednesday (Veterans Day), showers likely (70%) in the afternoon, then a good (50%) chance of showers at night.
• lows 38-42 cooling back to 38 Wednesday night highs near 52.
• Mostly cloudy with a (30%) chance of rain Thursday, a good (50%) chance of rain Thursday night,
• Rain likely (60%) and a bit warmer Friday through Saturday, cloudy with a good (50%) chance of showers Saturday night,
• Then mostly cloudy with rain likely (70%) Sunday.
• highs 55-52 warming back to 55 Sunday lows 42-47 cooling back to 42 Saturday night. (seasonal averages high 54 low 39)

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Your Saturday College Football Forecast:

Ducks vs Stanford at Stanford Stadium, Stanford, CA– Kickoff 4:30 PM PST: Too early for an accurate forecast.

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Beavers vs California at Memorial Stadium Berkeley, CA- Kickoff 7:30 PM PST: Too early for an accurate forecast.

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Forecast for Roseburg:

• Cloudy with widespread evening showers, a good (50%) chance of showers late tonight (under 0.10 in. of rain possible, snow level 3,500 ft. late at night.),
• Mostly cloudy with a good (50%) chance of showers Monday AM, a (40%) chance of afternoon showers (under 0.10 in. of rain possible) and a slight (20%) chance of thunderstorms (snow level 3,500 ft. in the afternoon), a (40%) chance of evening showers, partly cloudy patchy fog late Monday night,
• Mostly cloudy with patchy fog Tuesday AM, partly cloudy in the afternoon, partly cloudy with a (30%) chance of evening rain, then mostly cloudy with a (30%) chance of rain late Tuesday night,
• Mostly cloudy with rain Wednesday AM (Veterans Day), rain likely (70%) and a bit cooler in the afternoon, then a (40%) chance of rain Wednesday night.
• lows 42-38 warming to 42 Tuesday night cooling to 40 Wednesday night highs 54-50.
• Partly cloudy with a slight (20%) chance of showers Thursday, a slight (20%) chance of rain Thursday night,
• Cloudy with a (40%) chance of rain Friday, rain likely (70%) Friday night and Saturday, a good (50%) chance of showers Saturday night,
• Then rain likely (70%) Sunday.
• highs 52-56 lows 38-45 cooling to 43 Saturday night. (seasonal averages high 56 low 41)

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

• Cloudy with widespread coastal showers and isolated thunderstorms this evening and showers likely (70%) with a slight (20%) chance of thunderstorms late tonight while widespread evening inland showers and a good (50%) chance of showers inland late tonight (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of coastal showers and a slight (20%) chance of thunderstorms Monday while a (40%) chance of inland AM showers and a (30%) chance of inland showers and a slight (20%) chance of thunderstorms in the afternoon, a (30%) chance of evening showers,  just partly cloudy with patchy fog late Monday night,
• Partly cloudy inland with patchy fog Tuesday AM and just partly cloudy in the afternoon while mostly cloudy with patchy AM coastal fog and partly cloudy with a slight (20%) chance of afternoon rain, mostly cloudy with a (30%) chance of rain Tuesday night,
• Mostly cloudy with AM rain Wednesday (Veterans Day), rain likely (60%) in the afternoon, then a (30%) chance of rain Wednesday night.
• lows 46-44 warming to 49 Tuesday night cooling to 44 Wednesday night highs near 54.
• Partly cloudy with a (40%) chance of showers Thursday, mostly cloudy with a a good (50%) chance of rain Thursday night,
• Rain likely (60%) and a bit warmer Friday and Friday night,
• Rain Saturday, mostly cloudy with a a good (50%) chance of showers at night,
• Then rain likely (70%) Sunday.
• highs 54-58 cooling to 55 Sunday lows 47-50 cooling back to 47 Saturday night. (seasonal averages high 56 low 44).

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Forecast for the Cascades in Lane County:

• Cloudy and colder with rain and snow showers tonight (0.25 in. of rain possible, 1-3 in. of snow possible),
• Mostly cloudy and a bit cooler with a good (50%) chance of rain and snow showers  Monday (0.10 in. of rain possible), a (30%) chance of rain and snow showers in the evening, partly cloudy with a slight (20%) chance of rain and snow showers late Monday night,
• Partly cloudy Tuesday, partly cloudy with a slight (20%) chance of rain and snow in the evening, mostly cloudy with a good (50%) chance of rain and snow late at night,
• Mostly cloudy with rain and snow Wednesday (Veterans Day), then a good (50%) chance of rain and snow showers Wednesday night.
• snow level 5,000 ft. tonight, 3,500 ft. Monday and Monday night, free air freezing level 4,000 ft. rising to 4,500 ft. Tuesday, snow level 3,500 ft. Tuesday night, 4,500 ft. Wednesday, then 4,000 ft. Wednesday night.
• lows 26-23 warming back to 26 Tuesday night cooling to 22 Wednesday night highs near 36.
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain and snow Thursday, mostly cloudy with a (40%) chance of rain and snow at night,
• Mostly cloudy and a bit warmer with rain likely (60%) Friday and Friday night,
• Rain Saturday, rain and snow showers likely (70%) at night,
• Then rain and snow likely (70%) and a bit cooler Sunday.
• snow level 3,500 ft. Thursday, 4,500 ft. Thursday night, 6,000 ft. Friday, 6,500 ft. Friday night, 6,000 ft. Saturday, 4,500 ft. Saturday night, then 4,000 ft. Sunday.
• highs 39-42 cooling back to 39 Sunday lows 28-33 cooling back to 28 Saturday night.

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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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