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 for a cooling trend to more reasonable temperatures.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 35 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 28 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 36 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 UNTIL 10 PM TODAY FOR HOT, DRY, UNSTABLE CONDITIONS COMBINED WITH CRITICALLY DRY FUELS FOR NORTH OREGON COAST RANGE, THE EAST SLOPES OF THE CENTRAL OREGON COAST RANGE, THE WILLAMETTE VALLEY AND ADJACENT FOOTHILLS, THE NORTH OREGON CASCADES FOOTHILLS, THE GIFFORD PINCHOT NATIONAL FOREST, THE MT. HOOD NATIONAL FOREST WEST OF THE CASCADE CREST, THE WILLAMETTE NATIONAL FOREST , THE DESCHUTES NATIONAL FOREST AND MINUS THE WILLAPA HILLS INCLUDING PORTIONS OF THE SISTERS RANGER DISTRICT, THE SIUSLAW NATIONAL FOREST, THE TILLAMOOK NATIONAL FOREST AND OTHER OREGON DEPARTMENT OF FORESTRY AND BLM LANDS AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A RED FLAG WARNING IS IN EFFECT UNTIL 5 AM MONDAY FOR 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 SUNDAY UNTIL 5 AM MONDAY FOR THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• AN EXCESSIVE HEAT WARNING IS IN EFFECT UNTIL 9 PM THIS EVENING FOR ENTIRE WILLAMETTE VALLEY, THE COLUMBIA RIVER GORGE AND THE UPPER HOOD RIVER VALLEY.
• A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM SUNDAY FOR THE CENTRAL COAST RANGE OF WESTERN OREGON, EAST COLUMBIA RIVER GORGE OF OREGON, THE LOWER COLUMBIA BASIN AND THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS, THE NORTHERN OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY.
• A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM THIS EVENING FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY AND JACKSON COUNTY.
• 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:

• Sunny and a bit cooler today, partly cloudy with a slight (20%) chance of showers late tonight,
• Just partly cloudy and cooler Sunday through Monday AM, mostly sunny in the afternoon, then mostly clear Monday night.
• highs 99-92 lows near 60.
• Mostly sunny and a bit cooler Tuesday, partly cloudy Tuesday night through Thursday AM, mostly sunny and cooler Thursday afternoon, then just partly cloudy Thursday night and Friday.
• highs 88-82 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:,

• Areas of AM smoke, partly cloudy and cooler this afternoon with a slight (20%) chance of dry thunderstorms in the afternoon and evening, mostly cloudy with a slight (20%) chance of showers late tonight,
• Then partly cloudy and cooler Sunday with a slight (20%) chance of afternoon and evening thunderstorms, just partly cloudy late Sunday night,
• Partly cloudy Monday AM, sunny in the afternoon, mostly clear in the evening, then partly cloudy late at night.
• highs 100-93 lows 63-60.
• Partly cloudy and cooler with a slight (20%) chance of thunderstorms Tuesday and Tuesday night,
• Partly cloudy and a bit cooler Wednesday and at night,
• Sunny just a bit warmer Thursday, mostly clear in the evening, partly cloudy Thursday night,
• Then partly cloudy and a bit cooler with a slight (20%) chance of showers Friday afternoon.
• highs 90-84 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 this AM, partly cloudy and a bit cooler this afternoon with a slight (20%) chance of inland afternoon and evening thunderstorms, mostly cloudy with a slight (20%) chance of showers late tonight,
• Partly cloudy Sunday AM, sunny in the afternoon, mostly clear in the evening, partly cloudy Sunday night and Monday AM, sunny in the afternoon, mostly clear in the evening then partly cloudy late Monday night.
• highs near 67 lows near 57.
• Partly cloudy Tuesday through Wednesday, mostly clear Wednesday night,
• Mostly sunny Thursday, then partly cloudy Thursday night and Friday.
• 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 and a bit cooler with a slight (20%) chance of showers and thunderstorms this afternoon and evening, a slight (20%) chance of showers late tonight,
• Partly cloudy and cooler with a slight (20%) chance of showers and thunderstorms Sunday through Sunday evening, just partly cloudy at night,
• Partly cloudy and cooler with a slight (20%) chance of showers and thunderstorms Monday and Monday night.
• snow level above 8,000 ft. today through Monday night.
• highs 90-78 lows 53-50.
• Partly cloudy with a slight (20%) chance of showers and thunderstorms Tuesday afternoon and evening, partly cloudy Tuesday night through Wednesday night,
• Mostly sunny Thursday, partly cloudy at night,
• Then partly cloudy with a slight (20%) chance of showers Friday afternoon.
• snow level above 8,000 ft. Tuesday and Tuesday night, free air freezing level 11,000 ft. Wednesday through Thursday night, then snow level above 8,000 ft. Friday.
• highs 75-68 lows near 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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