Here is my new weekly weather quiz question. What is a “Temperature Inversion?” 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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Advisories:

• A HIGH WIND WARNING IS IN EFFECT FROM 4 PM THIS AFTERNOON UNTIL 10 PM SATURDAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH SURF WARNING IS IN EFFECT FROM 4 PM SATURDAY UNTIL 10 AM SUNDAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH WIND WARNING IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 10 PM SATURDAY FOR THE COAST RANGE OF NORTHWEST OREGON AND THE CENTRAL COAST RANGE OF OREGON.
• A WIND ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 10 PM SATURDAY FOR  THE LOWER COLUMBIA I-5 CORRIDOR, FOR THE ENTIRE I-5 CORRIDOR FROM PORTLAND SOUTH THROUGH EUGENE AND SPRINGFIELD.
• A HIGH SURF WARNING IS IN EFFECT FROM 10 AM SATURDAY UNTIL 10 AM SUNDAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A WINTER STORM WATCH IS IN EFFECT FROM SATURDAY MORNING THROUGH LATE SATURDAY NIGHT FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
• A HIGH SURF WARNING IS IN EFFECT FROM 10 PM TONIGHT UNTIL 10 AM SUNDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A HIGH WIND WARNING IS IN EFFECT FROM 7 PM THIS EVENING THROUGH 7 AM SATURDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WINTER STORM WATCH IS IN EFFECT FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTH OREGON CASCADES, AND THE SISKIYOUS MOUNTAINS.
• A HIGH WIND WARNING IS IN EFFECT FROM 1 AM UTIL 7 PM SATURDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.

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An upper level high pressure ridge ( Shaded “arch” shape) is going to keep sending waves of moisture at us. A frontal system is going to spread more rain over the Pacific Northwest. More storms will push in with the strongest frontal system coming through Oregon on Saturday increasing our chances for rain even more.

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Air Quality Index:

Eugene-Springfield: The Pollution Index is 15 in the Good category measuring Particulate Matter at Springfield City Hall. Data courtesy of Lane Regional Air Protection Agency (LRAPA)

Oakridge: The Pollution Index is 43 in the Good category measuring Particulate Matter at Willamette Activity Center, Oakridge.  Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Home Wood Heating Advisory:

Eugene/Springfield: (GREEN) Burning Allowed.

Oakridge: (GREEN) Burning Allowed.

The use of Pellet stoves is always allowed.

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

• Mostly cloudy with a (40%) chance of AM coastal showers and showers likely (60%) this afternoon while a good (50%) chance of inland showers (0.10 in. of rain possible) and breezy (Wind: S 20-30 mph at the beaches and SW 10-20 mph inland, gusts to 40 mph late ion the afternoon), a good (50%) chance of evening rain, rain late tonight (0.50 in. of rain possible) and windy (Wind: S 25-35 mph at the beaches SW 15-25 mph inland),
• AM coastal rain with rain and isolated thunderstorms Saturday afternoon while rain inland (0.70 in. of rain possible) and windy (Wind: W 20-30 mph AM gusts to 45 mph), coastal showers likely (60%) and isolated thunderstorms while inland evening showers and showers likely (60%) late Saturday night (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers Sunday, a slight (20%) chance of showers Sunday evening, mostly cloudy at night,
• highs 53-50 lows 49-40.
• Mostly cloudy with patchy AM fog and late night fog and lingering afternoon fog  Monday through Tuesday, partly cloudy at night,
• Mostly sunny Wednesday, mostly clear at night,
• Then partly cloudy Thursday.
• highs near 55 lows near 36. (seasonal averages high 51 low 40)

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Forecast for the Cascades of Lane County:

• AM rain and snow likely (60%), rain likely (60%) this afternoon (0.10 in. of rain possible, 1 in. of snow possible) and breezy (Wind: SW 10-15 mph increasing to SW 15-25 mph in the afternoon), cloudy with a (50%) chance of rain in the evening, rain likely (60%) tonight and windy (Wind: SW 20-30 mph gusts to 55 mph),
• AM rain, rain and snow showers Saturday afternoon and windy (Wind: SW 20-30 mph gusts to 55 mph), rain and snow showers Saturday night,
• Rain and snow showers likely (60%) Sunday, then mostly cloudy with a good (50%) chance of rain and snow Sunday night.
• snow level 5,000 ft. rising to 6,500 ft. today, 7,000 ft. tonight, 6,000 ft. falling to 3,500 ft. Saturday afternoon, 3,000 ft. Saturday night and Sunday, then 4,000 ft. Sunday night.
• highs 40-32 lows 36-26.
• A mix of clouds and sun with a slight (20%) chance of rain and snow Monday, partly cloudy at night and Tuesday, mostly clear Tuesday night,
• Partly cloudy Wednesday and Thursday, mostly clear Wednesday night.
• snow level 4,500 ft. Monday, free air freezing level 8,000 ft. at night, 9,000 ft. Tuesday, 9,000 ft. at night, 10,000 ft. Wednesday, 7,500 ft. at night, then 10,000 ft. Thursday.
• highs 39-44 cooling to near 32 Thursday lows near 32.