Here is my weekly weather quiz question. What is  a “ Penumbra?”  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 air high pressure ridge (Shaded “Arch” shape with blue arrows) is moving away from us allowing low pressure (Shaded “U” shape with blue arrows) to take over bringing back the rain for the weekend. The parade of storms resumes as a cold front pushes its way through Oregon. We wil be visited by another frontal system Tuesday and Wednesday.

________________

Air Quality Index:

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

Oakridge: The Air Quality Index is 31 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 60 in the Moderate category measuring Particulate Matter.

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

________________

Advisories:

• A HIGH WIND WARNING IS IN EFFECT FROM 4 PM TODAY UNTIL 4 AM SUNDAY NEAR THE BEACHES AND HEADLANDS FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A HIGH WIND WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A HIGH WIND WARNING IS IN EFFECT FROM NOON UNTIL 8 PM TONIGHT FOR THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A HIGH WIND WARNING IS IN EFFECT UNTIL  1 AM SUNDAY  FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT FROM 2 PM THIS AFTERNOON UNTIL 10 PM THIS EVENING FOR THE CENTRAL OREGON COAST.
• A FLOOD WATCH IS IN EFFECT THROUGH LATE TONIGHT FOR THE CENTRAL OREGON COAST, THE CURRY COUNTY COAST, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY.
• A WIND ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY.

________________

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

• Mostly cloudy with showers and a slight (20%) chance of thunderstorms this afternoon (0.25 in. of rain possible, more in storms), evening rain with a slight (20%) chance of thunderstorms, showers late tonight (0.50 in. of rain possible) and breezy (Wind: S 15-25 mph gusts to 35 mph decreasing to 10-15 mph gusts to 25 mph),
• AM showers likely (60%), showers with a slight (20%) chance of thunderstorms and a bit cooler Sunday afternoon (0.25 in. of rain possible), showers Sunday night (0.20 in. of rain possible),
• Mostly cloudy with showers likely (70%) in the AM, showers likely (70%) and a bit cooler with a slight (20%) chance of thunderstorms Monday afternoon, then mostly cloudy with a good (50%) chance of evening, then a slight (20%) chance of showers at night.
• highs 60-52 lows 44-39.
• Cloudy with a slight (20%) chance of rain Tuesday, rain and a bit warmer Tuesday night through Wednesday night,
• Mostly cloudy and a bit cooler with rain likely (70%) Thursday and Friday, a good (50%) chance of rain Thursday night.
• highs 52-57 cooling to 54 Friday lows near 43. (seasonal averages high 54 low 36).

_____

Home Wood Heating Advisory:

Eugene-Springfield: GREEN – Burning is Allowed.

Oakridge: GREEN – Burning is Allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA).

___________________

Forecast for Roseburg:

• Mostly cloudy with rain and a bit cooler this afternoon (0.20 in. of rain possible), evening rain, showers late tonight,
• AM showers likely (70%) Sunday AM, showers and a bit cooler with a slight (20%) chance of thunderstorms in the afternoon (0.15 in. of rain possible, snow level 3,000 ft.), showers likely (70%) with a slight (20%) chance of  thunderstorms in the evening, a good (50%) chance of showers late at night (0.10 in. of rain possible, snow level 3,000 ft.),
• Cloudy with a good (50%) chance of AM showers, showers and a bit cooler Monday with a slight (20%) chance of thunderstorms in the afternoon, mostly cloudy with a slight (20%) chance of showers Monday night.
• highs 60-52 lows 44-38.
• Mostly cloudy with rain and snow Tuesday, rain Tuesday night through Thursday, then rain likely (70%) Thursday night and Friday
• highs 53-60 cooling to 57 Friday lows near 43. (seasonal averages high 57 low 39).

________________

Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy with rain and a bit cooler this afternoon (0.70 in. of rain possible) and windy (Wind: S 10-20 mph increasing to S 25-35 mph this afternoon at the shore while S 10-20 mph inland), rain this evening, rain with a slight (20%) chance of thunderstorms late tonight while inland showers late (0.60 in. of rain possible), windy (Wind: S 25-35 mph shifting SW 10-15 mph late while SW 10-20 mph inland),
• Mostly cloudy with showers and a slight (20%) chance of thunderstorms and a bit cooler Sunday (0.40 in. of rain possible), showers likely (70%) with a slight (20%) chance of thunderstorms in the evening, a good (50%) chance of showers late Sunday night (0.25 in. of rain possible),
• Mostly cloudy with AM showers likely (70%) and a slight (20%) chance of thunderstorms, showers and a bit cooler Monday afternoon, then a slight (20%) chance of showers at night.
• highs 62-52 lows 48-43.
• Mostly cloudy with rain and a bit warmer Tuesday through Thursday, then rain likely (70%) Thursday night and Friday.
• highs 53-58 cooling to 56 Friday lows 47-50 cooling back to 47 Thursday night. (seasonal averages high 54 low 41).

________________

Forecast for the Cascades in Lane County:

• Mostly cloudy with rain (0.50 in. of rain possible) and a bit cooler this afternoon and breezy (Wind: S 10-15 mph gusts to 30 mph increasing to S 15-25 mph gusts to 45 mph this afternoon), evening rain with a slight (20%) chance of thunderstorms, rain and snow showers (0.75 in. of rain possible) late tonight and breezy (Wind: SW 15-25 mph gusts to 45 mph decreasing to SW 5-15 mph gusts to 25 mph late at night),
• Mostly cloudy and colder with rain and snow showers Sunday (0.25 in. of rain possible, 1-3 in. of snow possible) and Sunday night,
• Mostly cloudy and a bit warmer with rain and snow showers Monday, evening rain and snow showers  likely, then a good (50%)  chance of snow showers at night.
• snow level 6,000 ft. today, 7,000 ft. falling to 5,000 ft. tonight, 3,000 ft. Sunday, 3,500 ft. Sunday night, then 2,500 ft. Monday and Monday night.
• highs 54-34 lows 30-23.
• Mostly cloudy with a slight (20%) chance of AM snow, a bit warmer with good (50%) chance of rain and snow Tuesday afternoon, rain and snow Tuesday night,
• Rain Wednesday and at night,
• Mostly cloudy with rain and snow showers Thursday, then rain and snow likely (70%) Thursday night and Friday.
• snow level 3,000 ft. Tuesday, 4,500 ft. Tuesday night, 6,000 ft. Wednesday, 6,500 ft. Wednesday night, 5,000 ft. Thursday, 4,500 ft. Thursday night, then 3,500 ft. Friday.
• highs 38-44 cooling to 42 Friday lows near 30.

________________

**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.

________________