Check out my latest Eugene Daily News Weather Or Not column “I Can See Clearly Now,” But For How Long?
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Here is my weekly weather quiz question for the last time. What is “Coalescence?” Here is the correct answer. Coalescence is the process by which water droplets in a cloud collide and come together to form raindrops. I’ll have a new weekly weather question 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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Upper Level High Pressure (Shaded “Arch” shape with blue arrows) is still in control producing sinking air the result of which is late night and early AM fog with freezing fog in many locations. The graphics for days 3-7 show that high pressure will extend right down to the surface keeping us out dry through Thursday, then frontal systems start moving in as high pressure relinquishes its hold on us.
Note: The overnight air quality in Eugene/Springfield and Oakridge has become bad enough for a Red Home Wood Heating Advisory to be issued and continued for another day.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 61 in the Moderate category measuring Particulate Matter.
Oakridge: The Air Quality Index is 33 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 63 in the Moderate category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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Home Wood Burning Advisory:
(Posted Daily)
Eugene-Springfield: RED – Burning Prohibited. No Visible Smoke Allowed From A Chimney On A Residential Home.
Oakridge: RED – Burning Prohibited. No Visible Smoke Allowed From A Chimney On A Residential Home.
*Note: Pellet stoves may be used anytime if they produce no visible emissions.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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ADVISORIES:
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 2 PM THURSDAY FOR THE LOWER COLUMBIA, THE CENTRAL WILLAMETTE VALLEY AND THE SOUTH WILLAMETTE VALLEY.
- A FREEZING FOG ADVISORY IS IN EFFECT UNTIL NOON MONDAY FOR CENTRAL OREGON.
- A FREEZING FOG ADVISORY IS IN EFFECT UNTIL NOON MONDAY FOR NOTH CENTRAL OREGON AND CENTRAL OREGON.
- A DENSE FOG ADVISORY IS IN EFFECT FROM 2 AM UNTIL 10 AM MONDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, JACKSON COUNTY.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 2 PM THURSDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, JACKSON COUNTY, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
- AN AIR STAGNATION ADVISORY IS IN EFFECT THURSDAY FOR THE EAST SLOPES OF THE OREGON CASCADES, THE NORTHERN BLUE MOUNTAINS OF OREGON, THE EASTERN COLUMBIA RIVER GORGE, THE LOWER COLUMBIA BASIN OF OREGON, THE JOHN DAY BASIN, AND NORTH CENTRAL OREGON.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL NOON TUESDAY FOR CENTRAL OREGON.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL FURTHER NOTICE FOR NORTHERN HARNEY COUNTY, THE LOWER TREASURE VALLEY OF OREGON, AND THE BAKER VALLEY. ELEVATED POLLUTANT LEVELS ARE EXPECTED TO REMAIN AS HIGH PRESSURE PRODUCES SUBSIDENCE THAT HOLDS THE POLLUTANTS AT THE SURFACE.
- 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 freezing fog this evening, mostly cloudy with areas of freezing fog late tonight and Monday AM, sunny with patchy lingering fog Monday afternoon, clear in the evening, areas of freezing fog late Monday night,
- Cloudy with areas of AM freezing fog, mostly sunny with patchy lingering fog Tuesday afternoon, partly cloudy in the evening, cloudy with areas of fog and freezing fog late at night and Wednesday AM, partly cloudy with lingering patchy fog in the afternoon, areas of fog and freezing fog late Wednesday night.
- lows 23-27 highs near 40.
- AM freezing fog, a mix of clouds and sun Thursday with patchy afternoon lingering fog, mostly cloudy with a slight (20%) chance of rain at night,
- Mostly cloudy with a good (50%) chance of rain and a bit warmer Friday and Friday night,
- Mostly cloudy with rain likely (70%) Saturday, cloudy with rain likely (70%) Saturday, a good (50%) chance of rain Saturday night,
- Then cloudy with showers likely (70%) Sunday.
- highs 40-49 lows 35-37. (seasonal averages high 46 low 34)
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Forecast for Roseburg:
- Clear with patchy evening fog, partly cloudy with areas of fog and freezing fog late tonight,
- Mostly cloudy with areas of AM fog and freezing fog, sunny and a bit warmer with patchy lingering fog Monday afternoon, mostly clear with patchy evening fog, areas of fog and freezing fog late Monday night,
- Partly cloudy with areas of AM fog, sunny with patchy lingering fog Tuesday afternoon, areas of fog and freezing fog late Tuesday night and Wednesday AM, sunny and a bit warmer Wednesday with patchy lingering afternoon fog, patchy evening fog, then mostly clear with areas of fog and freezing fog late Wednesday night.
- lows 28-34 highs 40-42.
- Partly cloudy with areas of fog and freezing fog Thursday AM, partly cloudy and a bit warmer with patchy lingering fog in the afternoon, mostly cloudy with a slight (20%) chance of rain Thursday night,
- Mostly cloudy with a slight (20%) chance of AM rain, a slight (20%) chance of showers Friday afternoon, mostly cloudy with a (30%) chance of rain at night and Saturday, rain likely (70%) Saturday night,
- Then mostly cloudy and a bit cooler with a (30%) chance of rain Sunday,
- highs 46-49 cooling back to 46 Saturday lows 37-39. (seasonal averages high 48 low 37)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Clear tonight with patchy coastal frost,
- Partly cloudy with areas of AM fog, sunny Monday afternoon, mostly clear with patchy coastal frost Monday night,
- Partly cloudy with areas of AM fog Tuesday, sunny in the afternoon, partly cloudy with patchy coastal frost Tuesday night,
- Partly cloudy with patchy AM fog, sunny Wednesday, then mostly clear at night.
- lows near near 38 highs near 60.
- Partly cloudy with areas of AM fog, just partly cloudy and a bit cooler in the afternoon, becoming mostly cloudy with a slight (20%) chance of rain Thursday night,
- Mostly cloudy with a (40%) chance of rain and a bit cooler Friday through Saturday,
- Then mostly cloudy with a good (50%) chance of rain Sunday.
- highs 55-53 lows 42-44. (seasonal averages high 51 Low 40)
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Forecast for the Cascades in Lane County:
- Partly cloudy this evening, clear tonight,
- Sunny Monday, clear in the evening, partly cloudy Monday night,
- Mostly sunny and a bit warmer Tuesday, partly cloudy and a bit warmer at night and Wednesday, then clear Wednesday night.
- free air freezing level 13,000 ft. tonight and Monday, 12,000 ft. Monday night through Wednesday, then 13,000 ft. Wednesday night.
- lows 26-29 highs 38-40.
- Mostly sunny and a bit warmer Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night,
- Mostly cloudy and a bit warmer with a good (50%) chance of rain and snow Friday and at night,
- Cloudy and a bit cooler with a good (50%) chance of rain and snow Saturday, rain likely (70%) Saturday night,
- Then cloudy with a good (50%) chance of showers Sunday.
- free air freezing level 13,000 ft. Thursday, snow level above 8,000 ft. Thursday night, 5,500 ft. Friday, 4,500 ft. Friday night, 5,500 ft. Saturday, above 8,000 ft. Saturday night, then 7,500 ft. Sunday.
- highs 43-38 lows 32-29.
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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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