Here is my new weekly weather quiz question. What is the “dew point?”  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.

________________

An upper level low pressure trough (Shaded “U” shape with blue arrows) is going to follow closely behind the high pressure ridge (Shaded “Arch” shape with blue arrows that is over us today. A frontal system will move in Sunday to Monday (position shown is Monday) bringing more clouds and possible precipitation.

________________

Air Quality Index:

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

Oakridge: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 17 in the Good category measuring Particulate Matter.

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

________________

Advisories:

• 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.

____________

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

• Sunny and just a bit warmer today, mostly clear this evening, mostly cloudy late tonight,
• Mostly cloudy and bit a cooler with a (30%) chance of rain Saturday afternoon, a good (50%) chance of rain Saturday night,
• A mix of clouds and sun and a bit cooler Sunday with a (30%) chance of AM showers, a slight (20%) chance of afternoon showers, then partly cloudy with a (30%) chance of showers Sunday night.
• highs 85-78 lows near 60.
• Mostly cloudy with a (40%) chance of showers Monday, a (30%) chance of evening showers at night,
• Mostly cloudy with a (30%) chance of showers and a bit cooler Tuesday and in the evening,  partly cloudy with a slight (20%) chance of showers late Tuesday night,
• A mix of clouds and sun and a bit warmer Wednesday with a slight (20%) chance of AM showers, a (30%) chance of showers in the afternoon, partly cloudy with a (40%) chance of evening showers, mostly cloudy with a (40%) chance of showers late Wednesday night,
• Then a mix of clouds and sun and just a bit cooler Thursday with a (40%) chance of showers.
• highs 79-76 warming to near 80 Thursday cooling to 77 Friday lows 58-54. (seasonal averages high 84 low 52)

_________________

Forecast for the Umpqua Basin including Roseburg:

• Sunny and a bit warmer with patchy smoke today, mostly clear with patchy smoke this evening, becoming mostly cloudy with more patchy smoke late tonight and Saturday AM, partly cloudy and a bit cooler with patchy smoke and a slight (20%) chance of showers in the afternoon, mostly cloudy with patchy smoke and a slight (20%) chance of showers Saturday night,
• Mostly cloudy with patchy smoke and a slight (20%) chance of showers Sunday, partly cloudy with more patchy smoke and a slight (20%) chance of showers  in the evening, mostly cloudy with patchy smoke and a slight (20%) chance of showers late Sunday night.
• highs 88-85 lows near 60.
• Mostly cloudy with patchy smoke and a slight (20%) chance of showers and thunderstorms Monday AM, patchy smoke a slight (20%) chance of thunderstorms in the afternoon, a slight (20%) chance of showers with more patchy smoke Monday night,
• Partly cloudy with patchy smoke and a slight (20%) chance of AM showers and thunderstorms, a slight (20%) chance of thunderstorms and a bit cooler in the afternoon and at night Tuesday through (a bit warmer) Wednesday,
• Mostly cloudy with patchy smoke and a (30%) chance of showers Thursday AM, then partly cloudy and warmer with continuing patchy smoke and a slight (20%) chance of showers Thursday afternoon.
• highs 83-86 lows near 60. (seasonal averages high 86 low 56)

________________

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

• Partly cloudy this AM, sunny this afternoon, partly cloudy this evening with a slight (20%) chance of isolated coastal thunderstorms, just mostly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of coastal showers Saturday while mostly cloudy inland in the AM and partly cloudy with a slight (20%) chance of showers at in the afternoon, mostly cloudy with a slight (20% chance of showers Saturday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Sunday and Sunday night.
• highs near 66 lows near 56.
• Mostly cloudy with a slight (20%) chance of showers Monday through Tuesday, a (30%) chance of showers Tuesday night,
• Mostly cloudy with a (30%) chance of thunderstorms Wednesday and at night,
• Mostly cloudy with a slight (20%) chance of showers Thursday AM, then partly cloudy with a slight (20%) chance of showers in the afternoon.
• highs near 66 lows near 56. (seasonal averages high 65 low 53)

________________

Forecast for the Cascades in Lane County:

• Mostly sunny today, becoming partly cloudy late this afternoon, mostly clear tonight,
• Partly cloudy and a bit cooler Saturday, a slight (20%) chance of rain in afternoon and at night,
• A mix of clouds and sun and a bit cooler Sunday with a slight (20%) chance of AM showers, a slight (20%) chance of showers and thunderstorms and a bit warmer in the afternoon and evening, a (30%) chance of showers Sunday night.
• free air freezing level 13,000 ft. today, then snow level above 8,000 ft. tonight through Sunday night.
• highs 74-69 lows 46-48.
• A mix of clouds and sun with a slight (20%) chance of showers Monday AM, a slight (20%) chance of showers and thunderstorms in the afternoon, partly cloudy with a (30%) chance of showers and a slight (20%) chance of showers and thunderstorms in the evening, mostly cloudy with a (40%) chance of showers late Monday night,
• Mostly cloudy Tuesday with a (40%) chance of AM showers, a bit cooler with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon and evening, partly cloudy with a (40%) chance of showers late Tuesday night,
• A mix of clouds and sun with a 40% chance of showers Wednesday AM, a bit warmer with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon, partly cloudy with a (40%) chance of showers and a slight (20%) chance of thunderstorms in the evening, a slight (20%) chance of showers late Wednesday night,
• A mix of clouds and sun with a (40%) chance of showers slight chance of AM showers, then just a bit warmer with a slight (20%) chance of showers and thunderstorms Thursday afternoon.
• snow level above 8,000 ft. Monday through Thursday.
• highs 68-62 warming to 67 Thursday lows 48-43.

_______________

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________