That persistent Upper Level High Pressure Ridge (“Arch” shape) is continues sending cold air from the north over the Pacific Northwest keeping us colder than normal for the Pacific Northwest. The graphics for days 1-3 show no frontal systems in or approaching the Pacific Northwest until a cold front approaches from the northwest Thursday. The graphics for days 3-7 Friday through Tuesday show that cold front that pushed through early Friday, then a stationary front plants itself just inland of the West Coast.
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ADVISORIES:
- A FREEZE WARNING IS IN EFFECT FROM 2 AM UNTIL 8 AM WEDNESDAY FOR THE SOUTH CENTRAL OREGON COAST.
- A COLD WEATHER ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL UNTIL 10 AM WEDNESDAY FOR THE NORTH OREGON COAST RANGE LOWLANDS, THE CENTRAL OREGON COAST RANGE LOWLANDS, THE NORTH OREGON COAST RANGE, THE CENTRAL OREGON COAST RANGE, THE LOWER COLUMBIA RIVER, THE OUTER SOUTHEAST PORTLAND METRO, THE WEST CENTRAL WILLAMETTE VALLEY, THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS, THE LANE COUNTY LOWLANDS, THE CLACKAMAS COUNTY CASCADE FOOTHILLS, THE CASCADE FOOTHILLS OF MARION AND LINN COUNTIES, AND THE LANE COUNTY CASCADE FOOTHILLS.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL NOON FRIDAY FOR THE SOUTH CENTRAL OREGON COAST.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL NOON FRIDAY FOR CENTRAL DOUGLAS COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
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HEALTH ADVISORIES:
- A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER 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:
- Mostly clear with widespread frost tonight,
- Widespread AM frost, mostly sunny and a bit cooler Wednesday afternoon, mostly clear Wednesday night,
- Widespread AM frost, mostly sunny Thursday, mostly cloudy with patchy fog at night,
- Patchy AM dense fog, mostly sunny and a bit cooler with a slight (20%) chance of drizzle Friday afternoon, then mostly clear Friday night.
- lows 26-29 cooling to 27 Friday night highs 43-42. .
- Sunny and a bit warmer Saturday, clear Saturday night,
- Sunny Sunday, mostly clear at night,
- Sunny and a bit warmer Monday, mostly clear Monday night,
- Then sunny and a bit warmer Tuesday.
- highs 43-46 lows 25-27. (seasonal averages high 49 low 35)
HOME WOOD HEATING ADVISORY:
The Eugene & Springfield: YELLOW -Fireplace and wood stove used is cautioned. Protect air quality by not heating with wood when possible.
Oakridge And Westfir: YELLOW – Fireplace and wood stove used is cautioned. Protect air quality by not heating with wood when possible.
The use of pellet stoves is always allowed.
Data courtesy of Lane Regional Air Protection Agency (LRAPA.org)
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:Forecast for the Umpqua Valley including Roseburg
- Clear with patchy freezing fog late tonight,
- Sunny and a bit cooler Wednesday, mostly clear with patchy freezing fog late Wednesday night,
- Sunny Thursday, partly cloudy at night,
- Mostly sunny and a bit cooler Friday, then mostly clear late Friday night.
- lows 28-33 cooling to 30 Friday night highs 47-43.
- Sunny and a bit warmer Saturday, clear Saturday night,
- Sunny Sunday, clear at night,
- Then sunny and a bit warmer Monday and Tuesday, clear Monday night,
- highs 46-52 lows 27-32 (seasonal averages high 51 low 37)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Clear with areas of frost late tonight,
- Areas of AM frost, sunny and slightly cooler Wednesday afternoon, mostly clear Wednesday night,
- AM sun partly cloudy and a bit cooler Thursday afternoon, partly cloudy at night,
- Mostly sunny and a bit cooler Friday, then mostly clear Friday night.
- lows 29-33 cooling to 27 Friday night highs 56-49.
- Mostly sunny and a bit warmer Saturday, clear Saturday night,
- Sunny and a bit warmer Sunday and Monday, clear both nights,
- Then sunny and a bit cooler Tuesday.
- highs 50-58 cooling to 53 Tuesday lows 28-34. (seasonal averages high 54 low 41)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Clear tonight,
- Sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Sunny and a bit warmer Thursday, mostly cloudy in the evening, partly cloudy late at night,
- Mostly sunny and cooler with a good (50%) chance of snow Friday, partly cloudy with a (40%) chance of evening snow, mostly clear with a (40%) chance of snow late Friday night.
- free air freezing level 6,500 ft. rising to 7,000 ft. late tonight, 7,500 ft. rising to 10,000 ft. Wednesday afternoon, 10,000 ft. rising to 11,000 ft. late Wednesday night, 11,000 ft. Thursday, 10,000 ft. falling to 7,500 ft. late Thursday night, snow level 2,500 ft. Friday, then at the surface Friday night.
- low 26-29 cooling to 16 Friday night highs 42-48 cooling to 34 Friday.
- Sunny and a bit cooler Saturday, clear Saturday night,
- Sunny and a bit warmer Sunday and Monday, clear both nights,
- Then sunny and a bit warmer Tuesday.
- free air freezing level at the surface Saturday and Saturday night, 5,500 ft. Sunday, 7,500 ft. Sunday night, 10,000 ft. Monday, 9,000 ft. Monday night, then 11,000 ft. Tuesday.
- highs 28-45 lows 14-25.