Here is my weekly weather quiz question. What is the “Bergeron Process?” 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.

________________

 

An Upper Level High Pressure Ridge (Shaded “Arch” shape with blue arrows) will take over for some warming, but low pressure to the north (Shaded “U” shape) will help with a slight change. The graphics for days 1-3 show a frontal system moving through the Pacific Northwest late today into Thursday. The graphics for days 3-7 show the next frontal system approaching Oregon Tuesday, and another front approaching Thursday.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 35 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

__________________

Advisories:

• AN AIR QUALITY ALERT IS IN EFFECT UNTIL NOON TUESDAY FOR DESCHUTES COUNTY.
• AN AIR QUALITY ALERT IS IN EFFECT UNTIL 5 PM THIS EVENING FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, THE CURRY COUNTY COAST, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, EASTERN KLAMATH COUNTY, WESTERN LAKE COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE KLAMATH BASIN.
• 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, to include Shoalwater Bay to the north. 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.
• The Oregon Health Authority updated the Health Advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• 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.

________________

 

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

• A mix of clouds and sun and cooler this afternoon, mostly clear and a bit cooler late tonight,
• Mostly sunny and a bit warmer Friday, clear at night,
• Sunny and a bit warmer Saturday, clear Saturday night.
• highs 74-88 lows 48-54.
• Sunny and a bit warmer with patchy smoke Sunday and Monday, clear with patchy smoke both nights,
• AM patchy smoke, sunny and a bit cooler Tuesday afternoon, mostly clear at night,
• Then mostly sunny and a bit cooler Wednesday.
• highs 93-86 lows near 56. (seasonal averages high 82 low 51)

 

________________

Eugene-Springfield Pollen Count

Grass………. Low (2)
Trees………. Low (2)
Last Counted: 8/16/17
Data Courtesy of Oregon Allergy Associates.
Note: It would seem the pollen season is over.

________________

Forecast for Roseburg:

• Partly cloudy and a bit cooler with patchy smoke this afternoon, just mostly clear tonight,
• Sunny and a bit warmer Friday, clear at night,
• Sunny and a bit warmer Saturday, then clear Saturday night.
• highs 80-93 lows 53-59.
• Sunny and a bit warmer Sunday and Monday, clear both nights,
• Sunny and a bit cooler Tuesday, mostly clear at night,
• Then mostly sunny and a bit cooler Wednesday.
• highs 99-93 lows near 60. (seasonal averages high 84 low 55)

_____________________

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

• Partly cloudy and a bit cooler this afternoon, partly cloudy tonight and Friday AM, sunny and a bit cooler Friday afternoon, clear at night,
• Sunny and a bit warmer Saturday, clear Saturday night.
• highs 64-62 warming to 68 Saturday lows 50-53.
• Sunny Sunday, mostly clear Sunday night,
• Mostly sunny and a bit cooler Monday and Tuesday, mostly clear both nights,
• AM clouds, then sunny Wednesday,
• highs 68-66 lows near 55. (seasonal averages high 66 low 53)

________________

Forecast for the Cascades in Lane County:

• Partly cloudy and a bit cooler with patchy smoke this afternoon, mostly clear with patchy smoke tonight,
• Sunny and a bit warmer with patchy smoke Friday, clear with patchy smoke Friday night,
• Patchy AM smoke, sunny and a bit warmer with areas of smoke Saturday afternoon, clear with areas of smoke Saturday night.
• free air freezing level above 12,000 ft. today and tonight, 14,000 ft. Friday, 15,000 ft. Friday night, then 16,000 ft. Saturday and Saturday night.
• highs 64-80 lows 44-53.
• Sunny with areas of smoke and a bit warmer Sunday, clear with areas of smoke at night,
• Sunny with areas of smoke Monday, clear with areas of smoke Monday night,
• Then sunny and a bit cooler Tuesday and Wednesday, clear with areas of smoke Tuesday night.
• free air freezing level 16,000 ft. Sunday through Wednesday.
• highs 83-78 lows near 53.

 

________________

**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.

________________