Here is my weekly weather quiz question. What is “Undertow?” 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. Good luck.

________________

 

As predicted upper level high pressure (“Arch” shape in blue arrows) took over warming us up. We’re on our roller coaster again with heating followed by cooling over the weekend as a cold front slides through on Sunday.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 30 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 24 in the Good category measuring Particulate Matter.

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

________________

 

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR DRY AND SIGNIFICANTLY UNSTABLE CONDITIONS UNTIL 9PM TONIGHT FOR THE NORTH OREGON COAST, THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY, THE MT. HOOD NATIONAL FOREST, WEST OF CASCADE CREST, THE WILLAMETTE NATIONAL FOREST, THE UPPER HOOD RIVER VALLEY AND THE CENTRAL OREGON COASTAL STRIP. (IN CASE YOU DIDN’T NOTICE THAT INCLUDES ALL OF WESTERN OREGON FROM THE OREGON COAST RANGE TO THE CASCADE FOOTHILLS.)
• A RED FLAG WARNING IS IN EFFECT FOR STRONG GUSTY WINDS AND LOW RELATIVE HUMIDITY THROUGH 11 PM TONIGHT FOR THE UMPQUA BASIN, THE UMPQUA NATIONAL FOREST, THE SOUTHERN OREGON COAST, THE WESTERN ROGUE RIVER, THE SISKIYOU NATIONAL FOREST, THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, AND THE SOUTHERN OREGON CASCADES.
• A FIRE WEATHER WATCH IS IN EFFECT FROM SATURDAY AFTERNOON THROUGH SATURDAY EVENING FOR GUSTY WINDS AND AND LOW RELATIVE HUMIDITY FOR THE EAST SLOPES OF THE NORTHERN OREGON CASCADES AND THE LOWER COLUMBIA BASIN OF OREGON.
• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM FRIDAY FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY AND THE UPPER HOOD RIVER VALLEY.
• A health advisory remains in effect for the Ross Island Lagoon and the mouth of the lagoon as it connects to the Holgate Channel. Ross Island Lagoon is located about one river mile south of downtown Portland in Multnomah County. The advisory is being issued due to visual confirmation of a blue-green algae bloom in the lagoon. Oregon Public Health officials advise people to avoid swallowing or inhaling water droplets as a result of swimming or high-speed water activities, such as water skiing and power boating in areas where blooms are identified.
• A health advisory remains in effect for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the presence of high levels of blue-green algae and associated toxins that can be harmful to people and animals. Swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing and power boating, should be avoided in areas where blooms are identified. Although toxins are not absorbed through the skin, contact with cells from a bloom can cause skin irritation and a red, puffy rash in individuals with skin sensitivities, or those who develop rashes easily.
• A Blue-Green Algae health advisory remains in effect for Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake ONLY. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.

 

________________

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

• Clear tonight,
• Sunny and hot Friday, clear in the evening and partly cloudy late Friday night and Saturday AM, mostly sunny and cooler in the afternoon, clear in the evening, partly cloudy late Saturday night,
• Partly cloudy Sunday AM, mostly sunny and a bit cooler in the afternoon, then mostly clear Sunday night.
• lows 59-53 highs 99-84.
• AM sun, partly cloudy and a bit cooler Monday, partly cloudy with a slight (20%) chance of showers late Monday night and Tuesday AM, mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon and Tuesday night,
• Then mostly cloudy with a slight (20%) chance of showers Wednesday through Thursday.
• highs 82-75 lows near 54. (seasonal averages high 82 low 50)

 

________________

 

 

Forecast for Roseburg:

• Clear tonight,
• Sunny and hot Friday, clear at night,
• Sunny and cooler Saturday, mostly clear Saturday night,
• Mostly sunny and a bit cooler Sunday, then mostly clear at night.
• lows 57-55 highs 99-101 cooling to 92 Saturday.
• Sunny Monday, partly cloudy Monday night through Tuesday evening, mostly cloudy with a slight (20%) chance of showers late Tuesday night,
• Mostly cloudy with a slight (20%) chance of showers Wednesday AM, partly cloudy with a slight (20%) chance of showers in the afternoon and evening, then mostly cloudy with a slight (20%) chance of showers late Wednesday night and Thursday.
• highs 90-82 lows near 55. (seasonal averages high 83 low 55)

 

________________

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

• Clear tonight,
• Sunny and a bit cooler Friday, mostly cloudy with patchy coastal fog late Friday night while clear inland at night,
• Cloudy at the shore in the AM and sunny and a bit cooler Saturday afternoon while patchy AM inland fog and sunny in the afternoon, clear in the evening, partly cloudy with patchy coastal fog late Saturday night,
• Partly cloudy with patchy fog Sunday AM, sunny in the afternoon, then partly cloudy Sunday night.
• lows 52-54 highs 72-64.
• Partly cloudy Monday, partly cloudy with patchy fog late at night and Tuesday, partly cloudy in the evening, then mostly cloudy with a slight (20%) chance of showers late Tuesday night through Thursday.
• highs near 65 lows near 53. (seasonal averages high 66 low 53)

 

________________

 

Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit warmer Friday, clear at night,
• Sunny and a bit cooler Saturday, clear Saturday night,
• Sunny Sunday, then clear at night.
• free air freezing level 15,000 ft. tonight through Saturday night, then 14,000 ft. Sunday and Sunday night.
• lows 50-47 highs 82-76.
• Mostly sunny and a bit cooler Monday and Tuesday, mostly clear Monday night, partly cloudy Tuesday night,
• Partly cloudy in the AM, mostly sunny Wednesday afternoon, mostly clear in the evening, then mostly cloudy with a slight (20%) chance of showers late Wednesday night and Thursday.
• free air freezing level 14,000 ft. Sunday through Monday night, 12,000 ft. Tuesday, then snow level above 8,000 ft. Tuesday night and Wednesday AM.
• highs 76-70 lows 46-44 warming back to 46 Tuesday night.

________________

**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.

_______________