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 means more clouds and the slight chance of showers and 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 5 AM MONDAY THE UMPQUA NATIONAL FOREST AND THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN AND THE FREMONT-WINEMA NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL  11 PM MONDAY THE UMPQUA NATIONAL FOREST,  THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN AND THE FREMONT-WINEMA NATIONAL FOREST.
• A RED FLAG WARNING IS IN EFFECT UNTIL 5 AM MONDAY FOR THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN IN EASTERN LAKE AND WESTERN HARNEY COUNTIES.
• A RED FLAG WARNING IS IN EFFECT FROM 2 PM UNTIL 11 PM MONDAY FOR 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 11 PM TONIGHT FOR THE SOUTH CENTRAL OREGON COAST, THE UMPQUA BASIN, THE WESTERN ROGUE RIVER INCLUDING THE ILLINOIS VALLEY AND THE EASTERN ROGUE RIVER VALLEY.
• A RED FLAG WARNING IS IN EFFECT UNTIL 9 PM TONIGHT FOR THE EAST SLOPES OF THE NORTHERN OREGON CASCADES AND THE LOWER COLUMBIA BASIN OF OREGON,
• A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM TODAY FOR THE WESTERN COLUMBIA RIVER GORGE, THE LOWER COLUMBIA BASIN OF OREGON AND THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON.
• 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:

• Mostly cloudy with a good (50%) chance of showers and thunderstorms this evening, a slight (20%) chance of showers and thunderstorms late tonight (under 0.10 in. of rain possible, more in storms) and Monday AM, partly cloudy and warmer in the afternoon, partly cloudy Monday night,
• Partly cloudy Tuesday AM, mostly sunny in the afternoon, then partly cloudy Tuesday night through Wednesday night.
• lows 63-53 highs 88-83.
• Partly cloudy Thursday through Saturday evening, mostly cloudy late Saturday night,
• Then mostly cloudy Sunday with a slight (20%) chance of showers in the afternoon.
• highs 83-85 cooling to near 80 Sunday 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 areas of smoke and a (30%) chance of scattered thunderstorms this evening, patchy smoke with a slight (20%) chance of thunderstorms late tonight (under 0.10 in. of rain possible, more in storms),
• Mostly cloudy with patchy smoke and a slight (20%) chance of thunderstorms Monday afternoon (under 0.10 in. of rain possible, more in storms), partly cloudy with areas of smoke in the evening, mostly clear at night,
• Sunny in the AM, partly cloudy Tuesday afternoon, mostly clear Tuesday night,
• Partly cloudy  Wednesday AM, sunny and cooler in the afternoon, then mostly clear Wednesday night.
• lows 62-57 highs 90-86.
• Mostly sunny and a bit warmer Thursday, partly cloudy Thursday night through Friday night,
• Partly cloudy and a bit cooler Saturday and in the evening, mostly cloudy Saturday night,
• Then mostly cloudy Sunday with a slight (20%) chance of thunderstorms in the afternoon.
• highs 92-86 lows 58-60. (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 evening, a slight (20%) chance of showers late tonight,
• Mostly cloudy Monday AM with patchy coastal fog, partly cloudy with patchy coastal fog Monday night,
• Partly cloudy with patchy coastal AM fog, sunny Tuesday afternoon, mostly clear at night,
• Then partly cloudy Wednesday and Wednesday night.
• lows 57-55 highs near 66.
• Partly cloudy Thursday through Saturday, then mostly cloudy Saturday night and Sunday.
• highs 67-70 cooling to 65 Sunday lows near 56. (seasonal averages high 65 low 53)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with patchy smoke and a good (50%) chance of showers and thunderstorms this evening, a good (50%) chance of showers and a slight (20%) chance of thunderstorms late tonight (under 0.10 in. of rain possible, more in storms,
• Mostly cloudy with a slight (20%) chance of morning showers and thunderstorms, partly cloudy with a slight (20%) chance of showers and thunderstorms Monday afternoon and evening, just partly cloudy late Monday night,
• Mostly sunny Tuesday and cooler with a slight (20%) chance of showers and thunderstorms in the afternoon, partly cloudy with a slight (20%) chance of showers and thunderstorms in the evening, then just partly cloudy Tuesday night through Wednesday night.
• snow level above 8,000 ft. tonight through Tuesday night, free air freezing level 11,000 ft. Wednesday, then 12,000 ft. Wednesday night.
• lows 53-46 highs 77-72.
• Partly cloudy Thursday and Thursday night,
• Partly cloudy Friday with a slight (20%) chance of showers and thunderstorms in the afternoon through Saturday evening, mostly cloudy with a slight (20%) chance of showers late Saturday night,
• A mix of clouds and sun with a slight (20%) chance of showers Sunday AM, then a slight (20%) chance of showers and thunderstorms and a bit warmer in the afternoon.
• free air freezing level 13,000 ft. Thursday and Thursday night, then snow level above 8,000 ft. Friday through Sunday.
• highs 72-68 lows near 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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