Here is my weekly weather quiz question for the last time. What is a “Warm Occlusion?” Here is the correct answer. A Warm Occlusion is a frontal zone formed when a cold front overtakes a warm front and, finding colder air ahead of the warm front, leaves the ground and rises up and over this denser air. Compare with cold occlusion. 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. Good luck.

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A weak cold front slid through the Pacific Northwest, but did little to change our weather except to give us one day of cooling. An upper level high pressure ridge (Shaded “Arch” shape in blue arrows) strengthens again to bring more sunshine and warmer temperatures for the workweek.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 30 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 in the Good category measuring Ozone.

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

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Advisories:

• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM MONDAY FOR STRONG GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR THE SOUTH CENTRAL OREGON COAST INCLUDING COOS COUNTY AND DOUGLAS COUNTY.
• A FIRE WEATHER WATCH IS IN EFFECT IS IN EFFECT FROM MONDAY AFTERNOON THROUGH MONDAY EVENING FOR STRONG GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR COOS COUNTY, CURRY COUNTY, DOUGLAS COUNTY, AND LANE COUNTY INCLUDING THE WESTERN KLAMATH NATIONAL FOREST, THE UMPQUA NATIONAL FOREST, THE WESTERN ROGUE RIVER AND THE SISKIYOU NATIONAL FOREST.
• A FREEZE WATCH IS IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING FOR CENTRAL OREGON.
• A Health Advisory remains in effect for ocean water contact at Neskowin Beach located in Tillamook County due to higher than normal levels of fecal bacteria. Contact with the water can result in diarrhea, stomach cramps, skin rashes, upper respiratory infections and other illnesses. Direct contact with the water should be avoided in this area until the advisory is lifted, especially by children and the elderly who may be more vulnerable to waterborne bacteria. 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.
• A Health Advisory remains in effect for ocean water contact at Nye Beach located in Lincoln County due to higher than normal levels of fecal bacteria. Contact with the water can result in diarrhea, stomach cramps, skin rashes, upper respiratory infections and other illnesses.Direct contact with the water should be avoided in this area until the advisory is lifted, especially by children and the elderly who may be more vulnerable to waterborne bacteria. 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.
• A Blue-Green Algae Health Advisory remains in effect for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the presence of high levels of blue-green algae and associated toxins that can be harmful to people and animals. Swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing and power boating, should be avoided in areas where blooms are identified. Although toxins are not absorbed through the skin, contact with cells from a bloom can cause skin irritation and a red, puffy rash in individuals with skin sensitivities, or those who develop rashes easily.
• A Blue-Green Algae Health Advisory remains in effect for Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake ONLY. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly clear and colder late tonight,
• Sunny and a bit warmer Monday and Tuesday, clear both nights,
• Sunny and just a bit cooler Wednesday, then clear Wednesday night.
• lows 42-47 highs 79-83 cooling to 80 Wednesday.
• Sunny and a bit warmer Thursday and Friday, clear at night,
• Then mostly sunny and a bit cooler Saturday and Sunday, mostly clear Saturday night.
• highs 84-87 cooling to near 82 Sunday lows 50-53. (seasonal averages high 79 low 48)

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College Football Forecast:

Saturday September 17th

Ducks vs. Nebraska at Memorial Stadium Lincoln, Nebraska Kickoff 12:30 PM– Mostly sunny 65 degrees and warming as the game progresses to 75 toward games end, Wind NW 8 mph.

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Beavers vs Idaho State at Reser Stadium Kickoff 2 PM – Mostly sunny 82 warming to 87 then cooling toward games end, Wind NE 10 mph.

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Forecast for Roseburg:

• Clear tonight,
• Sunny and a bit warmer Monday and Tuesday, clear both nights.
• Mostly sunny and a bit cooler Wednesday, then mostly clear at night.
• lows near 48 highs 80-85 cooling to 83 Wednesday.
• Mostly sunny and a bit warmer Thursday, mostly clear at night,
• Sunny and a bit warmer Friday, mostly clear Friday night,
• Then sunny and a bit cooler Saturday and Sunday, clear Saturday night.
• highs 84-90 cooling to 85 Sunday lows 49-52. (seasonal averages high 80 low 52)

 

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly clear this evening, partly cloudy late tonight with patchy coastal fog late tonight and Monday AM, sunny and a bit warmer Monday afternoon and Tuesday, clear Monday night, clear Tuesday with patchy coastal fog late Wednesday night.
• lows 50-47 warming to 49 Wednesday night highs 70-66.
• Partly cloudy Thursday AM, mostly sunny in the afternoon, mostly clear Thursday night,
• Mostly sunny and a bit warmer Friday, mostly clear at night,
• Then sunny Saturday and Sunday, clear Saturday night.
• highs 66-68 cooling back to 66 Sunday lows 50-52. (seasonal averages high 65 low 51)

 

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Forecast for the Cascades in Lane County:

• Mostly clear tonight,
• Sunny and a bit warmer Monday, Tuesday and Wednesday, then clear each night.
• free air freezing level 11,000 ft. falling to 10,000 ft. tonight, 9,000 ft. Monday, 11,000 ft. Monday night through Tuesday night, then 12,000 ft. Wednesday and Wednesday night.
• lows 36-40 highs 63-68.
• Sunny and a bit warmer Thursday and Friday, clear Thursday night, mostly clear Friday night,
• Then mostly sunny and a bit warmer Saturday and a bit cooler Sunday, mostly clear Sunday night.
• free air freezing level 12,000 ft. Thursday,  13,000 ft. Thursday night, 14,000 ft. Friday, 15,000 ft. Friday night and Saturday, then 14,000 ft. Saturday night and Sunday.
• highs 72-77 cooling to 74 Sunday lows 43-47.

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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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