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 Saturday through Wednesday show a stationary front that 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 TODAY FOR THE SOUTH CENTRAL OREGON COAST.
- A COLD WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM TODAY 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:
- Widespread AM frost, mostly sunny and a bit cooler this afternoon, mostly clear tonight,
- 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.
- highs 43-42 lows 26-29 cooling to 27 Friday night. .
- 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
- Sunny and a bit cooler today, mostly clear with patchy freezing fog late tonight,
- Sunny Thursday, partly cloudy at night,
- Mostly sunny and a bit cooler Friday, then mostly clear late Friday night.
- highs 47-43 lows 32-33 cooling to 30 Friday night.
- 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:
- Areas of AM frost, sunny and slightly cooler this afternoon, mostly clear tonight,
- 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.
- highs 56-49 lows 32-33 cooling to 27 Friday night.
- 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:
- Sunny and a bit warmer today, mostly clear tonight,
- 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 7,500 ft. rising to 10,000 ft. this afternoon, 10,000 ft. rising to 11,000 ft. late tonight, 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.
- highs 42-48 cooling to 34 Friday low 27-16.
- 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.