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) is moving in behind that high which gave us some sunshine Friday. A frontal system was pushed through Oregon Saturday ushering in more 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 46 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 30 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 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:

• Mostly cloudy and a bit cooler with showers today (0.10 in. of rain possible), showers likely (70%) this evening, a good (50%) chance of showers late tonight (under 0.10 in. of rain possible),
• A bit cooler with a (40%) chance of showers Monday (0.10 in. of rain possible), partly cloudy with slight (20%) chance of evening showers, just partly cloudy with patchy fog at night,
• Patchy AM fog, a mix of clouds and sun with a slight (20%) chance of showers Tuesday afternoon, mostly cloudy with a (40%) chance of rain Tuesday night.
• highs 55-52 lows 38-42.
• Mostly cloudy and just a bit warmer with rain likely (60%) Wednesday (Veterans Day) and at night.
• Mostly cloudy with a (30%) chance of rain Thursday, a good (50%) chance of rain Thursday night,
• Then rain likely (60%) Friday through Saturday.
• highs 52-55 lows 39-46. (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 a chance of rain, 50 cooling slowly as the game progresses, wind S 5-10 mph.

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Forecast for Roseburg:

• Showers and cooler today (0.15 in. of rain possible), cloudy with evening showers likely (70%), 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 (30%) chance of evening showers, partly cloudy patchy fog late Monday night (under 0.10 in. of rain possible, snow level 3,500 ft.),
• Mostly cloudy with patchy fog Tuesday AM, partly cloudy in the afternoon, then partly cloudy with a slight (20%) chance of rain Tuesday night.
• highs 54-52 lows 40-42.
• Mostly cloudy with rain Wednesday (Veterans Day), rain likely (70%) Wednesday night,
• Mostly cloudy with a (30%) chance of showers Thursday and Thursday night,
• Cloudy with a (40%) chance of rain Friday, then mostly cloudy with rain likely (70%) Friday night and Saturday.
• highs 52-56 lows 39-46. (seasonal averages high 56 low 41)

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

• Coastal showers this AM with showers and cooler with a slight (20%) chance of thunderstorms this afternoon (0.20 in. of rain possible) while inland AM showers likely (70%) with showers this afternoon (0.10 in. of rain possible), cloudy with coastal showers likely (70%) and a slight (20%) chance of thunderstorms, while a (40%) chance of showers inland tonight (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers and a slight (20%) chance of thunderstorms at the shore 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, partly cloudy with a (30%) chance of evening showers,  just partly cloudy with patchy fog late Monday night,
• Partly cloudy with patchy fog Tuesday AM, just partly cloudy in the afternoon, then becoming mostly cloudy with a (30%) chance of rain Tuesday night.
• highs near 54 lows 45-42 warming to 48 Tuesday night.
• Mostly cloudy with rain Wednesday (Veterans Day), rain likely (60%) at night,
• Mostly cloudy with a good (50%) chance of showers Thursday and Thursday night,
• Then rain likely (60%) Friday through Saturday.
• highs 54-58 lows 42-50. (seasonal averages high 57 low 44).

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Forecast for the Cascades in Lane County:

• Cloudy and colder with rain and snow showers today (0.50 in. of rain possible, 1-4 in. of snow possible) and this evening, a good (50%) chance of rain and snow showers late tonight (0.10 in. of rain possible, 2 in. of snow possible),
• 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 in the evening, partly cloudy with a slight (20%) chance of rain and snow showers late Monday night,
• Partly cloudy Tuesday, then partly cloudy with a (30%) chance of rain and snow at night.
• snow level 4,500 ft. today, 3,000 ft. tonight, 3,500 ft. Monday and Monday night, free air freezing level 4,000 ft. Tuesday, then snow level 3,500 ft. Tuesday night.
• highs near 38 lows 25-23 warming back to 25 Tuesday night.
• Mostly cloudy with rain and snow likely Wednesday (Veterans Day) and Wednesday night,
• A (40%) chance of rain and snow Thursday, a good (50%) chance of rain and snow at night,
• Then mostly cloudy and a bit warmer with rain likely (60%) Friday through Saturday.
• snow level 4,500 ft. Wednesday, 4,000 ft. Wednesday night, 3,500 ft. Thursday, 4,500 ft. Thursday night, 6,000 ft. Friday, 6,500 ft. Friday night, then 6,000 ft. Saturday.
• highs 37-42 lows 24-32.

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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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