Here is my new weekly weather quiz question. What is a “Jet Max?” 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 pressure trough (Shaded “U” shape with blue arrows) is moving in behind the high pressure ridge (Shaded “Arch” shape with blue arrows) that is leaving us. A frontal system will push in (position shown is Wednesday) bringing more clouds, slightly cooler temperatures and a continued chance of precipitation.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 28 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 70 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 63 in the Moderate category measuring Particulate Matter.

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

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Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR THUNDERSTORMS PRODUCING ABUNDANT LIGHTNING FROM 5 PM UNTIL 11 PM TUESDAY FOR THE UMPQUA NATIONAL FOREST, AND THE SOUTH OREGON CASCADES.
• A RED FLAG WARNING IS IN EFFECT FOR THUNDERSTORMS PRODUCING ABUNDANT LIGHTNING UNTIL 11 PM TUESDAY FOR THE NORTH OREGON CASCADE FOOTHILLS, THE CENTRAL OREGON CASCADE FOOTHILLS, THE MT. HOOD NATIONAL FOREST WEST OF CASCADE CREST, THE WILLAMETTE NATIONAL FOREST, THE EAST SLOPES OF THE CENTRAL OREGON CASCADES, THE DESCHUTES NATIONAL FOREST, MINUS SISTERS RANGER DISTRICT, THE EAST SLOPES OF THE NORTHERN OREGON CASCADES, THE CENTRAL MOUNTAINS OF OREGON, THE LOWER COLUMBIA BASIN OF OREGON, THE SOUTHERN BLUE AND STRAWBERRY MOUNTAINS, THE NORTHERN BLUE MOUNTAINS OF OREGON AND THE CENTRAL BLUE MOUNTAINS.
• A HEALTH ADVISORY HAS BEEN ISSUED FOR UPPER KLAMATH LAKE AND AGENCY LAKE DOWN TO KENO DAM TO THE CALIFORNIA BORDER, LOCATED JUST NORTH OF KLAMATH FALLS ALONG HIGHWAY 97 IN KLAMATH COUNTY. WATER MONITORING BY THE USGS HAS CONFIRMED THE PRESENCE OF BLUE-GREEN ALGAE TOXINS WHICH CAN BE HARMFUL TO HUMANS AND ANIMALS. SWALLOWING, INHALING OR SKIN CONTACT WITH WATER DROPLETS SHOULD BE AVOIDED.

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

• Mostly cloudy with a slight (20%) chance of showers and thunderstorms tonight,
• A mix of clouds and sun Tuesday with a slight (20%) chance of AM showers, mostly cloudy with a slight (20%) chance of evening showers and thunderstorms, a slight (20%) chance of showers late Tuesday night,
• Mostly cloudy Wednesday AM, partly cloudy and cooler in the afternoon and evening, mostly cloudy late Wednesday night,
• A mix of clouds and sun and just a bit cooler Thursday with a (40%) chance of afternoon and evening showers and a slight (20%) chance of thunderstorms, mostly cloudy with a (40%) chance of showers and thunderstorms in the evening,  a (40%) chance of showers late Thursday night.
• lows 58-55 highs 84-78.
• A mix of clouds and sun with a (40%) chance of showers Friday, mostly cloudy with a (40%) chance of evening showers, just partly cloudy late Friday night and Saturday AM, mostly sunny and a bit warmer in the afternoon and Sunday, mostly clear both nights,
• Mostly sunny Monday AM, then partly cloudy and a bit cooler in the afternoon.
• highs 77-84 cooling to 82 Monday lows near 53. (seasonal averages high 84 low 52)

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Forecast for the Umpqua Basin including Roseburg:

• Partly cloudy with patchy smoke and a slight (20%) chance of evening thunderstorms, mostly cloudy with a (30%) chance of showers and a slight (20%) chance of thunderstorms late tonight,
• Mostly cloudy with patchy smoke and a slight (20%) chance of thunderstorms Tuesday AM, partly cloudy with patchy smoke and a slight (20%) chance of thunderstorms in the afternoon and evening, mostly cloudy with patchy smoke and a slight (20%) chance of showers late Tuesday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Wednesday afternoon and at night,
• Mostly cloudy with a slight (20%) chance of showers Thursday AM, a bit cooler with a (30%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon and evening,  then a (30%) chance of showers late Thursday night.
• lows 60-58 highs 85-80.
• Mostly cloudy with a slight (20%) chance of showers Friday AM, partly cloudy and a bit warmer in the afternoon and evening, mostly clear at night,
• Then sunny and a bit warmer Saturday, Sunday and Monday, clear each night.
• highs 80-90 cooling to 87 lows near 57. (seasonal averages high 86 low 56)

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

• Mostly cloudy with a slight (20%) chance of evening inland thunderstorms, patchy smoke with a slight (20%) chance of showers and thunderstorms late tonight,
• Mostly cloudy with patchy smoke and a (30%) chance of showers and a slight (20%) chance of  inland thunderstorms Tuesday AM and a slight (20%) chance of inland afternoon thunderstorms while patchy smoke and a slight (20%) chance of coastal showers Tuesday, patchy smoke and a slight (20%) chance of showers Tuesday night,
• Mostly cloudy with a slight (20%) chance of showers Wednesday AM, partly cloudy and a bit warmer with a slight (20%) chance of showers in the afternoon and evening, mostly cloudy with a slight (20%) chance of showers late Wednesday night,
• Mostly cloudy with a (30%) chance of showers Thursday, then a slight (20%) chance of showers at night.
• lows near 58 highs near 66.
• Mostly cloudy with a slight (20%) chance of showers Friday AM, partly cloudy in the afternoon and evening, mostly clear late Friday night,
• Mostly sunny and a bit warmer Saturday and Sunday, mostly clear at night,
• Then just partly cloudy Monday.
• highs 66-70 lows 56-54. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a (40%) chance of scattered evening showers and thunderstorms, a slight (20%) chance of isolated showers and thunderstorms late tonight (under 0.10 in of rain possible, more in storms),
• A mix of clouds and sun Tuesday with a slight (20%) chance of AM showers, a (30%) chance of scattered showers and thunderstorms and a bit warmer in the afternoon, mostly cloudy with a (30%) chance of scattered showers and thunderstorms in the evening, partly cloudy with a (30%) chance of isolated showers late Tuesday night,
• A mix of clouds and sun with a slight (20%) chance of showers Wednesday AM, a slight (20%) chance of showers and thunderstorms and a bit cooler in the afternoon, partly cloudy with a slight (20%) chance of evening showers and thunderstorms, just partly cloudy late Wednesday night,
• A mix of clouds and sun and a bit cooler Thursday with showers likely (60%) and a slight (20%) chance of thunderstorms in the afternoon, mostly cloudy and a bit warmer with showers likely (60%) and a slight (20%) chance of thunderstorms in the evening, mostly cloudy with  a good (50%) chance of showers and thunderstorms late Thursday night.
• snow level above 8,000 ft. tonight through Thursday night.
• lows 47-50 cooling to 43 Thursday night highs 75-66.
• Mostly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms Friday AM, partly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon and evening, just partly cloudy late at night,
• Mostly sunny and a bit warmer Saturday and Sunday, mostly clear both nights.
• Mostly sunny Monday AM, then partly cloudy Monday afternoon.
• snow level above 8,000 ft. Friday and Friday night, free air freezing level 12,000 ft. Saturday, 13,000 ft. Saturday night, 14,000 ft. Sunday and Sunday night, then 13,000 ft. Monday.
• highs 65-72 cooling to 68 Monday lows 42-48.

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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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