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 19 in the Good category measuring Particulate Matter.

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

Cottage Grove: The Air Quality Index is 15 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 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:

• Partly cloudy today with a slight (20%) chance of showers and thunderstorms this afternoon, becoming mostly cloudy with a slight (20%) chance of showers and thunderstorms tonight,
• A mix of clouds and sun Tuesday, mostly cloudy with a slight (20%) chance of evening showers and thunderstorms in the evening, a slight (20%) chance of showers late Tuesday night,
• Mostly cloudy Wednesday AM, partly cloudy and cooler in the afternoon and Wednesday night.
• highs 86-82 lows 60-56.
• A mix of clouds and sun and just a bit cooler Thursday with a (40%) chance of afternoon showers and thunderstorms, mostly cloudy with a good (50%) chance of showers and thunderstorms in the evening,  a good (50%) chance of showers and a slight (20%) chance of thunderstorms late Thursday night,
• A mix of clouds and sun with a (40%) chance of showers and a slight (20%) chance of thunderstorms Friday AM, a slight (20%) chance of showers in the afternoon, mostly cloudy with a slight (20%) chance of evening showers, just mostly clear late Friday night,
• Mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
• highs 78-84 lows 57-52 warming to 84 Saturday night. (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 isolated thunderstorms this afternoon, mostly cloudy with patchy smoke and a slight (20%) chance of evening thunderstorms, a (30%) chance of scattered thunderstorms late tonight,
• Mostly cloudy with patchy smoke and a (30%) chance of thunderstorms Tuesday AM, partly cloudy with a slight (20%) chance of thunderstorms in the afternoon and evening, mostly cloudy with patchy smoke 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.
• highs 86 lows near 60.
• Mostly cloudy and cooler with a slight (20%) chance of showers Thursday AM, a bit cooler with a (30%) chance of thunderstorms in the afternoon and evening,  just mostly cloudy late Thursday night.
• Mostly cloudy Friday AM, partly cloudy and a bit warmer in the afternoon and evening, mostly clear at night,
• Mostly sunny and a bit warmer Saturday, mostly clear Saturday night,
• Then sunny and warmer Sunday.
• highs 80-90 lows 58-56. (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 showers this afternoon, a slight (20%) chance of evening inland thunderstorms, patchy smoke 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 while a slight (20%) chance of inland afternoon thunderstorms, mostly cloudy with patchy smoke and a slight (20%) chance of coastal showers at night while a slight (20%) chance of evening inland thunderstorms and a slight (20%) chance of showers late Tuesday night,
• Then mostly cloudy with a slight (20%) chance of showers Wednesday and partly cloudy with a slight (20%) chance of showers Wednesday night.
• highs near 66 lows near 58.
• Mostly cloudy with a slight (20%) chance of showers Thursday AM, a (30%) chance of afternoon thunderstorms, a slight (20%) chance of showers in the evening, just mostly cloudy late Thursday night,
• Partly cloudy Friday and Friday night,
• Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear at night.
• highs 66-70 lows 56-54. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• A mix of clouds and sun with a good (50%) chance of scattered showers and thunderstorms this afternoon (0.10 in. of rain possible, more in storms), becoming mostly cloudy with a (40%) chance of scattered evening showers and thunderstorms, a (40%) 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, partly cloudy with a (30%) chance of scattered showers and thunderstorms in the evening, partly cloudy with a (30%) chance of showers late Tuesday night,
• Partly cloudy with a slight (20%) chance of showers Wednesday AM, a slight (20%) chance of showers and thunderstorms and a bit cooler in the afternoon and evening, then just partly cloudy late Wednesday night.
• snow level above 8,000 ft. today through Wednesday night.
• highs near 76 lows near 48.
• 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 afternoon, mostly cloudy 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,
• Mostly cloudy with a (30%) chance of showers and a slight (20%) chance of thunderstorms Friday AM, partly cloudy with a slight (20%) chance of showers in the afternoon and evening, just partly cloudy late at night,
• Mostly sunny and warmer Saturday and Sunday, mostly clear Saturday night.
• snow level above 8,000 ft. Thursday through Friday night, free air freezing level 12,000 ft. Saturday, 14,000 ft. Saturday night, then 15,000 ft. Sunday.
• highs 65-72 lows 44-47.

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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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