Nov
25.
Check out my latest Eugene Daily News Weather Or Not column Is It Possible That A Popular Christmas Song Has Hidden Meanings?
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Here is my weekly weather quiz question for the last time. What is a“Closed Low?” Here is the correct answer. A Closed Low is a low pressure area with a distinct center of cyclonic circulation which can be completely encircled by one or more isobars or height contour lines. The term usually is used to distinguish a low pressure area aloft from a low-pressure trough. Closed lows aloft typically are partially or completely detached from the main westerly current, and thus move relatively slowly (see Cutoff Low). 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) continues the chance for rain. The graphics for days 1-3 show the front next frontal system headed our way Sunday and Monday. The graphics for days 3-7 show the series of complex frontal systems that are headed our way Wednesday and next Sunday. Looks like we’ll get some drying time Wednesday and Thursday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 41 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 52 in the Moderate category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 32 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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ADVISORIES:
- A WIND ADVISORY IS IN EFFECT UNTIL 1 PM SUNDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
- A HIGH WIND WARNING IS IN EFFECT UNTIL 1 PM SUNDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
- A Health Advisory remains in effect for the Link and Klamath from Keno Dam to J.C. Boyle Dam (downstream from Keno Dam). Water monitoring has confirmed the presence of blue-green algae and the toxins they produce. 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.
- A Health Advisory HAS BEEN LIFTED 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 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. Please remember that blooms can still come and go, so OHA advises pet owners to avoid areas where the water is foamy, scummy, thick like paint, pea-green, blue-green or brownish red in color, or if a thick mat of blue-green algae is visible in the water, or bright green cells are suspended in the water column.
- 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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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Partly cloudy with patchy fog and a (40%) chance of evening rain, mostly cloudy with a slight (20%) chance of rain late tonight (0.10 in. of rain possible),
- Mostly cloudy with rain (0.50 in. of rain possible) and a bit warmer Sunday and breezy (Wind: S 15-25 mph gusts to 35 mph shifting SW 10-15 mph gusts to 25 mph in the afternoon), a good (50%) chance of evening showers, a slight (20%) chance of showers and colder late Sunday night (under 0.10 in. of rain possible),
- A mix of clouds and sun and a bit cooler Monday with a slight (20%) chance of afternoon showers, mostly cloudy with a slight (20%) chance of showers late at night,
- A good (50%) chance of AM rain Tuesday, rain likely (70%) in the afternoon, a good (50%) chance of showers with patchy fog Tuesday night.
- lows 46-37 warming to 40 Monday night cooling to 37 Tuesday night highs 55-50.
- Patchy AM fog, a mix of clouds and sun and a bit cooler Wednesday, partly cloudy with patchy fog at night,
- Patchy AM fog, partly cloudy and a bit cooler Thursday, mostly cloudy Thursday night,
- Mostly cloudy with a (40%) chance of rain Friday, a good (50%) chance of rain at night,
- Then mostly cloudy and a bit cooler with a (40%) chance of showers Saturday.
- highs 49-46 lows 33-36. (seasonal averages high 49 low 36)
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Forecast for Roseburg:
- Mostly cloudy with a (40%) chance of isolated evening showers, a (40%) chance of rain late tonight (0.25 in. of rain possible),
- Mostly cloudy with rain and a bit warmer Sunday (0.25 in. of rain possible, afternoon snow level 3,500 ft.), a (40%) chance of showers and colder at night (0.10 in. of rain possible, snow level 3,500 ft.),
- Mostly cloudy with a (30%) chance of showers and a bit cooler Monday (snow level 3,000 ft. rising to 3,500 ft. under 0.10 in. of rain possible), areas of fog and a slight (20%) chance of rain late Monday night,
- Areas of AM fog with a (40%) chance of showers, mostly cloudy and a bit cooler with showers likely (60%) Tuesday afternoon, a (40%) chance of showers at night with areas of fog late at night.
- lows 52-38 highs 57-53.
- Mostly cloudy with areas of AM fog, partly cloudy and a bit cooler Wednesday afternoon, partly cloudy with areas of fog late at night,
- Partly cloudy with patchy AM fog, sunny and a bit warmer Thursday afternoon, partly cloudy in the evening, mostly cloudy with areas of fog late Thursday night,
- Areas of AM fog, mostly cloudy and a bit cooler with a (40%) chance of rain Friday and Friday night,
- Then mostly cloudy and a bit cooler with a good (50%) chance of rain and snow showers Saturday.
- highs 48-46 lows 33-37. (seasonal averages high 50 low 39)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with evening isolated showers, coastal rain likely (70%) late tonight while a good (50%) chance of inland rain late tonight (0.25 in. of rain possible) and breezy (Wind: S 20-30 mph at the shore while S 10-20 mph inland),
- Mostly cloudy with rain and a bit warmer Sunday (0.50 in. of rain possible) and breezy (Wind: S 15-25 mph gusts to 40 mph decreasing and shifting to SW 10-15 mph in the afternoon), a good (50%) chance of showers at night (0.25 in. of rain possible),
- Mostly cloudy with a (30%) of AM coastal showers and partly cloudy and a bit cooler in the afternoon while partly cloudy with a (40%) chance of inland showers Monday (under 0.10 in. of rain possible), areas of fog with a slight (20%) chance of rain late Monday night (under 0.10 in. of rain possible),
- Mostly cloudy with areas of AM fog and a good (50%) chance of showers, showers likely (70%) and a bit warmer Tuesday afternoon, a (40%) chance of evening showers, then areas of fog late Tuesday night.
- lows 54-42 warming to 44 Monday night cooling to 42 Tuesday night highs 59-54.
- Mostly cloudy with areas of AM fog Wednesday, partly cloudy and a bit cooler in the afternoon, mostly clear with areas of fog late at night,
- Partly cloudy Thursday and at night with areas of AM and late night fog,
- Areas of AM fog, mostly cloudy and a bit cooler with a (40%) chance of rain Friday, rain likely (70%) Friday night,
- Then mostly cloudy and a bit cooler with a good (50%) chance of showers Saturday.
- highs 52-50 lows 38-42. (seasonal averages high 53 Low 41)
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Forecast for the Cascades in Lane County:
- Mostly cloudy tonight and breezy (Wind: S 15-25 mph gusts to 55 mph),
- Mostly cloudy and a bit cooler with rain Sunday and breezy (Wind: S 15-25 mph gusts to 50 mph decreasing to 40 mph in the afternoon), cloudy and colder with evening rain and snow showers, a good (50%) chance of snow showers and a slight (20%) chance of showers late Sunday night (0.10 in. of rain possible, 1.00 in. of snow possible),
- A mix of clouds and sun with a slight (20%) chance of rain and snow showers and a bit cooler in the afternoon, just partly cloudy Monday night,
- A mix of clouds and sun with a slight (20%) chance of AM rain and snow, rain and snow and a bit warmer Tuesday afternoon, mostly cloudy with evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers late Tuesday night.
- free air freezing level 10,000 ft. tonight, snow level above 8,000 ft. falling to 6,500 ft. Sunday afternoon, 3,500 ft. Sunday night and Monday, 4,500 ft. rising to 5,500 ft. Monday night, 4,500 ft. Tuesday, then 4,500 ft. falling to 3,500 ft. late Tuesday night.
- lows 39-23 highs 43-35 warming to 38 Tuesday.
- A mix of clouds and sun and a bit cooler Wednesday, partly cloudy at night and Thursday (a bit warmer), mostly cloudy Thursday night,
- Mostly cloudy and a bit cooler with a slight (20%) chance of rain and snow Friday, then mostly cloudy with a good (50%) chance of rain and snow showers and a bit cooler Friday night and Saturday.
- free air freezing level 5,500 ft. Wednesday, 6,500 ft. Wednesday night, 7,000 ft. Thursday, 8,000 ft. Thursday night, snow level 6,000 ft. Friday, 4,000 ft Friday night, then 3,000 ft. Saturday.
- highs 37-40 cooling to 32 Saturday lows near 25.
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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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