Here is my weekly weather quiz question for the last time. What is “Juvenile Water?” Here is the correct answer. Juvenile Water is in hydrologic terms, water formed chemically within the earth and brought to the surface in intrusive rock. 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 high pressure ridge that gave us record high temperatures in the 100s will slowly move away allowing an upper low pressure trough to bring an increased southerly airflow. That will mean some more clouds and the slight chance of thunderstorms with a cooling trend to more reasonable temperatures.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 25 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 26 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 in the Good 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 UNTIL 9 PM TODAY FOR THE EAST SLOPES OF THE NORTHERN OREGON CASCADES AND THE LOWER COLUMBIA RIVER BASIN.
• THE SOUTH CENTRAL OREGON COAST, THE WESTERN ROGUE RIVER INCLUDING THE ILLINOIS VALLEY, THE UMPQUA BASIN AND THE FREMONT-WINEMA NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT UNTIL 10 PM TODAY FOR THE CENTRAL MOUNTAINS OF OREGON, THE SOUTHERN BLUE MOUNTAINS AND THE STRAWBERRY MOUNTAINS.
• A RED FLAG WARNING IS IN EFFECT FROM 11 AM TODAY UNTIL 5 AM MONDAY FOR THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM TODAY FOR THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE AND THE UPPER HOOD RIVER VALLEY.
• A HEALTH ADVISORY HAS BEEN ISSUED FOR UPPER KLAMATH LAKE AND AGENCY LAKE DOWN TO KENO DAM, 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 and cooler with a slight (20%) chance of showers and thunderstorms this afternoon and tonight,
• Partly cloudy Monday AM, mostly sunny and a bit cooler in the afternoon and Tuesday, mostly clear Monday night, partly cloudy Tuesday night.
• highs 94-87 lows 58-55.
• Partly cloudy Wednesday through Friday (a bit warmer Friday), mostly clear Friday night,
• Then mostly sunny and a bit warmer Saturday.
• highs 83-88 lows near 55. (seasonal averages high 84 low 52)
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Eugene/Springfield Pollen Count:

Trees: Low- 4

Grass: Moderate- 5*

Reading as of: 7/25/15

*Now the grass pollen season is officially over.

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Forecast for the Umpqua Basin including Roseburg:

• Mostly cloudy with patchy smoke and a slight (20%) chance of isolated AM thunderstorms, partly cloudy and cooler with areas of smoke and a slight (20%) chance of isolated thunderstorms this afternoon, areas of evening fog, mostly cloudy with a slight (20%) chance of isolated thunderstorms late tonight,
• Partly cloudy with a slight (20%) chance of thunderstorms Monday  afternoon, mostly clear at night,
• Then just partly cloudy and cooler Tuesday and Tuesday night.
• highs 93-90 lows 63-58.
• Partly cloudy and cooler Wednesday and Wednesday night,
• Sunny just a bit warmer Thursday, partly cloudy and a bit warmer Thursday night through Saturday AM,  then sunny Saturday afternoon.
• highs 83-89 lows near 58. (seasonal averages high 86 low 57)

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

• Mostly cloudy with a slight (20%) chance of isolated thunderstorms this AM, partly cloudy with a slight (20%) chance of thunderstorms this afternoon, mostly cloudy with a slight (20%) chance of isolated thunderstorms this evening, just mostly cloudy late tonight,
• Mostly cloudy Monday AM, sunny in the afternoon, then partly cloudy Monday evening through Tuesday night.
• highs near 67 lows near 57.
• Partly cloudy Wednesday, mostly clear at night,
• Mostly sunny Thursday, partly cloudy Thursday night through Friday night,
• Partly cloudy Saturday AM, then sunny in the afternoon.
• highs near 68 lows near 56. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Partly cloudy with patchy smoke and cooler with a slight (20%) chance of showers and thunderstorms this AM, more patchy smoke with a (30%) chance of showers this afternoon and tonight,
• Partly cloudy and cooler with a slight (20%) chance of showers and thunderstorms Monday and in the evening, just partly cloudy late Monday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Tuesday afternoon and evening, then just partly cloudy Tuesday night.
• snow level above 8,000 ft. tonight through Tuesday night.
• highs 83-76 lows 53-47.
• Partly cloudy and a bit cooler Wednesday and Wednesday night,
• Mostly sunny Thursday AM, partly cloudy in the afternoon through Friday AM, mostly sunny and a bit warmer with a slight (20%) chance of showers and thunderstorms in the afternoon, mostly clear with a slight (20%) chance of showers and thunderstorms Friday night,
• Then mostly sunny with a slight (20%) chance of showers and thunderstorms Saturday.
• free air freezing level 11,000 ft. Wednesday, 12,000 ft. Wednesday night and Thursday, 13,000 ft. Thursday night, then snow level above 8,000 ft. Friday through Saturday.
• highs 72-74 lows 46-49.

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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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