Here is my weekly weather quiz question for the last time. What is a “Bow Echo?” Here is the correct answer.  ABow Echo is a radar echo which is linear but bent outward in a bow shape. Damaging straight-line winds often occur near the “crest” or center of a bow echo. Areas of circulation also can develop at either end of a bow echo, which sometimes can lead to tornado formation – especially in the left (usually northern) end, where the circulation exhibits cyclonic rotation. I’ll have a new weekly weather quiz question for you starting Monday. The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An Upper Level Low Pressure Trough (Shaded “U” shape with blue arrows) is slowly moving away from the Willamette Valley allowing daytime heating to increase, but another trough is close behind and will help push the next frontal system over Oregon bringing cooler temperatures and much needed rain. As a result the smoke has returned to the southern Willamette Valley and will retreat again with the rainy weather. The graphics for days 1-3 show the frontal system approaching the coast Sunday morning. The graphics for days 3-7 show that frontal system after it pushed through the Pacific Northwest.

Note: The Autumnal Equinox officially ushers in the the season of Autumn next Friday September 22nd at 1:02 PM.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 58 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 68 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 61 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

• A  FREEZE WARNING IS IN EFFECT FROM 2 AM UNTIL 8 AM TODAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN CENTRAL AND EASTERN LAKE COUNTY.
• A  FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 8 AM TODAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN CENTRAL AND EASTERN LAKE COUNTY.
• AN AIR QUALITY ALERT IS IN EFFECT UNTIL 6 PM SUNDAY FOR LANE COUNTY.
• AN AIR QUALITY ALERT IS IN EFFECT UNTIL 10 AM MONDAY FOR HOOD RIVER COUNTY AND WASCO COUNTY.
• The Oregon Health Authority issued a Health Advisory for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• The Oregon Health Authority has updated the Health Advisory issued July 28 for Howard Bay (also known locally as Howards Bay or Howard’s Bay), located in the southwest corner of Upper Klamath Lake including Shoalwater Bay to the north and now all of Upper Klamath Lake. These areas of Upper Klamath Lake are located off Oregon Route 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Howard Bay. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Howard Bay and Shoalwater Bay at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• A Health Advisory remains in effect for Agency Lake, located just north of Klamath Falls along U.S. Highway 97 in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the lake. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Agency Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• A Health Advisory remains in effect for Willow Creek Reservoir, located just east of the town of Heppner in Morrow County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in the reservoir. These toxin concentrations can be harmful to humans and animals. People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue green or brownish red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur is discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified, or an advisory issued, can expose people to the toxins being produced. Although toxins are not absorbed through the skin, people who have skin sensitivities that come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Willow Creek Reservoir at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• A Health Advisory remains in effect for Coffenbury Lake, located at Fort Stevens State Park about five miles northwest of US-101 ALT, Northwest Ridgefield Road near Warrenton in Clatsop County. Water monitoring has confirmed the presence of blue-green algae that can produce toxins in Coffenbury Lake. These blue-green algae levels are likely to be associated with dangerous cyanotoxin concentrations in the water that can be harmful to humans and animals.  People should always avoid areas with visible scum that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish-red. Swimming and high-speed water activities such as water skiing or power boating where ingestion and inhalation exposure can occur are discouraged. Swallowing or inhaling water droplets as a result of these water activities in areas where a bloom has been identified or an advisory issued, can expose people to the toxins that can be produced. Although toxins are not absorbed through the skin, people with skin sensitivities who come into contact with a bloom may experience a puffy, red rash at the affected area. Drinking water directly from Coffenbury Lake at this time is especially dangerous. OHA Public Health Division officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

 

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Your College Football Forecast:

Ducks vs Wyoming, at War Memorial Stadium – Laramie, Wyoming– Kickoff: 4:00 PM PDT – Mostly cloudy, 62 degrees and cooling as the game progresses, breezy – wind WSW to 20 mph.

Beavers vs Washington State, at Martin Stadium – Pullman, Washington– Kickoff: 2:30 PM PDT- Mostly sunny, 62 degrees warming to 66 degrees, then slow cooling toward the end of the game, wind ESE 10 mph.

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

• Partly cloudy and a bit cooler with areas of smoke today and tonight,
• Patchy AM smoke, mostly cloudy with rain likely (70%) of rain and a bit cooler Sunday afternoon (under 0.10 in. of rain possible), rain at night (0.15 in. of rain possible),
• Mostly cloudy with showers and a bit cooler Monday and Monday night.
• highs 78-63 lows 50-52.
• Mostly cloudy with AM showers likely (60%), a good (50%) chance of showers and a bit warmer Tuesday afternoon and at night,
• Mostly cloudy with a (40%) chance of showers Wednesday, a (30%) chance of showers Wednesday night,
• A mix of clouds and sun and a bit warmer with a (30%) chance of showers Thursday, mostly cloudy with a (30%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late Thursday night,
• A slight (20%) chance of AM showers, then a mix of clouds and sun Friday afternoon.
• highs 63-68 lows near 50. (seasonal averages high 77 low 47)

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Forecast for Roseburg:

• Mostly cloudy with patchy AM smoke, partly cloudy with patchy smoke and a bit cooler today and tonight,
• Mostly cloudy with patchy AM smoke, a bit cooler with a (30%) chance of rain Sunday afternoon, rain at night (0.15 in. of rain possible),
• Mostly cloudy with AM showers,  likely (70%), showers and a bit cooler Monday afternoon and Monday night.
• highs 82-63 lows 50-52 cooling back to 50 Monday night.
• Mostly cloudy with AM showers, a good (50%) chance of showers Tuesday afternoon through Wednesday night,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Thursday, a slight (20%) chance of showers at night and Friday AM, just mostly cloudy Friday afternoon.
• highs 66-64 warming to 72 Friday lows 52-46. (seasonal averages high 79 low 51)

 

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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 and evening, mostly cloudy late tonight,
• Mostly cloudy with a (30%) chance of rain and a bit warmer Sunday afternoon (under 0.10 in. of rain possible), rain Sunday night (0.15 in. of rain possible),
• Cloudy with a good (50%) chance of AM showers, showers and cooler Monday afternoon and at night.
• highs 62-64 cooling back to 62 Monday lows near 52.
• Mostly cloudy with AM showers, a bit warmer with a good (50%) chance of showers Tuesday afternoon, mostly cloudy with a (40%) chance of showers Tuesday night through Thursday, a slight (20%) chance of showers Thursday night,
• Mostly cloudy Friday with a slight (20%) chance of AM showers.
• highs 63-60 warming to 65 Friday lows 52-49. (seasonal averages high 65 low 50)

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Forecast for the Cascades in Lane County:

• Partly cloudy and a bit warmer with areas of smoke this afternoon, partly cloudy with areas of smoke late tonight,
• A mix of clouds and sun with areas of AM smoke, a bit cooler with a good (50%) chance of rain Sunday afternoon, evening rain, rain and snow late Sunday night,
• Showers Monday AM, cooler with rain and snow showers in the afternoon and Monday night.
• free air freezing level 10,000 ft. today, 11,000 ft. tonight, snow level above 8,000 ft. Sunday and Sunday night, 6,000 ft. Monday, then 5,000 ft. Monday night.
• highs 65-44 lows 42-34.
• Mostly cloudy with rain and snow showers Tuesday AM, mostly cloudy with a good (50%) chance of showers in the afternoon and Tuesday night,
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Wednesday through Thursday, a  (30%) chance of evening showers, party cloudy with a slight (20%) chance of showers at night,
• Then a mix of clouds and sun with a slight (20%) chance of showers Friday.
• snow level 5,000 ft. Tuesday, 6,000 ft. Tuesday night and Wednesday, 6,500 ft. falling to 5,000 ft. late Wednesday night, 5,000 ft. Thursday, 5,500 ft. Thursday night, then 6,500 ft. rising to 7,500 ft. Friday afternoon.
• highs 44-54 lows 34-36.

 

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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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