Aug
23.
An Upper Level High Pressure Ridge formed a heat dome over the Pacific Northwest. The graphics for days 1-3 show no frontal systems sliding into the Pacific Northwest. The graphics for days 3-7 Tuesday through Saturday show a cold front moving in between Thursday and Friday and another one is stretched offshore next Saturday.
ADVISORIES:
- AN OZONE ADVISORY IS IN EFFECT FOR THE EUGENE/SPRINGFIELD METRO AREA UNTIL 10 PM MONDAY DUE TO ELEVATED LEVELS OF OZONE POLLUTION (SMOG).
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 8 PM MONDAY FOR THE TUALATIN VALLEY, PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, INNER PORTLAND METRO, WEST CENTRAL WILLAMETTE VALLEY, EAST CENTRAL WILLAMETTE VALLEY, BENTON COUNTY LOWLANDS, LINN COUNTY LOWLANDS, AND THE LANE COUNTY LOWLANDS, THE LANE COUNTY CASCADE FOOTHILLS, AND THE CASCADES OF LANE COUNTY.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 8 PM MONDAY FOR THE LANE COUNTY CASCADE FOOTHILLS AND THE CASCADES OF LANE COUNTY.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL 9 PM MONDAY FOR CROOK, DESCHUTES, JEFFERSON, AND WESTERN CROOK COUNTIES OF OREGON.
- A RED FLAG WARNING IS IN EFFECT FROM NOON SUNDAY UNTIL 9 PM MONDAY FOR HOT, DRY, AND UNSTABLE CONDITIONS FOR THE CENTRAL MOUNTAINS OF OREGON AND NORTHERN DESCHUTES NATIONAL FOREST.
- A RED FLAG WARNING IS IN EFFECT FROM 1 PM UNTIL 9 PM SUNDAY UNTIL 9 PM SUNDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR THE SISKIYOU MOUNTAINS, THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE AND WESTERN HARNEY COUNTES.
- AN EXTREME HEAT WARNING IS IN EFFECT UNTIL 11 PM TUESDAY FOR LOWER COLUMBIA RIVER, TUALATIN VALLEY, PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, INNER PORTLAND METRO, EAST PORTLAND METRO, OUTER SOUTHEAST PORTLAND METRO, WEST CENTRAL WILLAMETTE VALLEY, BENTON COUNTY LOWLANDS, LINN COUNTY LOWLANDS, LANE COUNTY LOWLANDS, WEST COLUMBIA RIVER GORGE I-84 CORRIDOR, UPPER HOOD RIVER VALLEY, AND THE CENTRAL COLUMBIA RIVER GORGE I-84 CORRIDOR, CLACKAMAS COUNTY CASCADE FOOTHILLS, CASCADE FOOTHILLS OF LINN AND MARION COUNTIES, AND THE LANE COUNTY CASCADE FOOTHILLS.
- AN EXTREME HEAT WARNING IS IN EFFECT UNTIL 9 PM WEDNESDAY FOR THE EASTERN COLUMBIA RIVER GORGE OF OREGON, THE LOWER COLUMBIA BASIN OF OREGON, THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, AND NORTH CENTRAL OREGON.
- AN EXTREME HEAT WARNING IS IN EFFECT UNTIL 8 PM MONDAY FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
- A HEAT ADVISORY IS IN EFFECT UNTIL 5 AM TUESDAY FOR NORTHERN OREGON COAST RANGE LOWLANDS, CENTRAL OREGON COAST RANGE LOWLANDS, NORTH OREGON CASCADES, CASCADES OF MARION AND LINN COUNTIES, AND THE CASCADES OF LANE COUNTY.
- A HEAT ADVISORY IS IN EFFECT UNTIL 5 AM MONDAY FOR THE NORTH OREGON COAST RANGE AND THE CENTRAL OREGON COAST RANGE.
- A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM TONIGHT FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS AND THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
- A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM SUNDAY FOR CENTRAL DOUGLAS COUNTY, AND EASTERN DOUGLAS FOOTHILLS.
- A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM WEDNESDAY FOR THE GRANDE RONDE VALLEY, JOHN DAY BASIN, AND CENTRAL OREGON.
- A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM SUNDAY FOR WALLOWA COUNTY AND THE EAST SLOPES OF THE OREGON CASCADES.
HEALTH ADVISORIES:
- A RECREATIONAL HEALTH ADVISORY IS IN EFFECT DUE TO A FOR THE WILLAMETTE RIVER TO INCLUDE ROSS ISLAND BRIDGE DOWN RIVER TO WAPATO BRIDGE AND KELLY POINT PARK. AREAS OF THE RIVER AFFECTED BY THE ADVISORY ARE IN MULTNOMAH COUNTY. *PEOPLE SHOULD AVOID SWIMMING AND HIGH-SPEED ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS WHERE BLOOMS ARE PRESENT, AS THE MAJOR ROUTE OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE WILLAMETTE RIVER TO ENJOY ACTIVITIES SUCH AS FISHING, HIKING, BIKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY, WHICH INCREASES THE RISK OF INHALING CYANOTOXINS.
- A RECREATIONAL HEALTH ADVISORY IS IN EFFECT FOR ODEL LAKE IN KLAMATH COUNTY DUE TO THE PRESENCE OF MICROCYSTIN.*PEOPLE SHOULD AVOID SWIMMING AND HIGH-SPEED ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS WHERE BLOOMS ARE PRESENT, AS THE MAJOR ROUT OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT ODEL LAKE TO ENJOY ACTIVITIES SUCH AS FISHING, HIKING, BIKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY, WHICH INCREASES THE RISK OF INHALING MICROCYSTIN.
- A RECREATIONAL HEALTH ADVISORY IS IN EFFECT DUE TO A FOR BROWNLEE RESERVOIR IN BAKER COUNTY DUE TO THE SPREAD OF *PEOPLE SHOULD AVOID SWIMMING AND HIGH-SPEED ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS WHERE BLOOMS ARE PRESENT, AS THE MAJOR ROUT OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT THE WILLAMETTE RIVER TO ENJOY ACTIVITIES SUCH AS FISHING, HIKING, BIKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY, WHICH INCREASES THE RISK OF INHALING CYANOTOXINS. *
- A RECREATIONAL HEALTH ADVISORY IS IN EFFECT FOR ECKMAN LAKE IN LINCOLN COUNTY DUE TO THE PRESENCE OF CYANOBACTERIA.*PEOPLE SHOULD AVOID SWIMMING AND HIGH-SPEED ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS WHERE BLOOMS ARE PRESENT, AS THE MAJOR ROUT OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT ODEL LAKE TO ENJOY ACTIVITIES SUCH AS FISHING, HIKING, BIKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY, WHICH INCREASES THE RISK OF INHALING SAXITOXIN (PSP).
- A RECREATIONAL HEALTH ADVISORY IS IN EFFECT FOR UPPER KLAMATH LAKE IN KLAMATH COUNTY DUE TO THE PRESENCE OF MICROCYSTIN.*PEOPLE SHOULD AVOID SWIMMING AND HIGH-SPEED ACTIVITIES, SUCH AS WATER SKIING OR POWER BOATING, IN AREAS WHERE BLOOMS ARE PRESENT, AS THE MAJOR ROUT OF EXPOSURE IS INGESTION OF WATER. TOXINS ARE NOT ABSORBED THROUGH THE SKIN, HOWEVER THOSE WITH SKIN SENSITIVITIES MAY GET A PUFFY RED RASH. OREGON HEALTH AUTHORITY ENCOURAGES PEOPLE TO VISIT UPPER KLAMATH LAKE TO ENJOY ACTIVITIES SUCH AS FISHING, HIKING, BIKING, PICNICKING, BIRD WATCHING, CANOEING, AND KAYAKING. BOATING IS SAFE AS LONG AS SPEEDS DO NOT CREATE EXCESSIVE WATER SPRAY, WHICH INCREASES THE RISK OF INHALING MICROCYSTIN.
- 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.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 54 in the Moderate category measuring Particulate Matter.
Oakridge: The Air Quality Index is 74 in the Moderate category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 59 in the Moderate category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA.org)
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Eugene-Springfield Area Pollen count:
GRASS: 0 ABSENT
TREES: 0 ABSENT
WEEDS: 0 ABSENT
Measured 8.21.25
Data courtesy of Oregon Allergy Associates.
The grass pollen season has just about ended.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Partly cloudy tonight,
- Mostly sunny and a bit cooler,(HOT), Sunday, partly cloudy Sunday night,
- Mostly sunny and a bit cooler,(HOT), Monday, partly cloudy at night,
- Sunny and a bit cooler, (HOT), Tuesday, partly cloudy Tuesday night.
- lows 60-62 cooling to 59 Tuesday night highs 97-93.
- Mostly sunny and a bit cooler,(HOT), Wednesday, partly cloudy Wednesday night,
- Mostly sunny and a bit cooler Thursday, partly cloudy at night,
- Mostly sunny and a bit cooler Friday, mostly clear in the evening, partly cloudy late Friday night,.
- Then mostly sunny Saturday.
- highs 90-85 lows 55-57 cooling to 54 Friday night. (seasonal averages high 83 low 51).
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Forecast for the Umpqua Valley including Roseburg:
- Partly cloudy tonight,
- Some AM clouds, sunny and a bit cooler (Hot), Sunday afternoon, mostly clear with a slight (20%)partly cloudy Sunday night,
- Some AM clouds, sunny (Hot), Monday afternoon, then mostly clear at night,
- Some AM clouds, sunny and a bit cooler Tuesday, partly cloudy with a slight (20%) chance of evening thunderstorms, just partly cloudy late Tuesday night.
- lows 65-64 warming back to 65 Monday night highs 101-97.
- Partly cloudy start, sunny and a bit cooler Wednesday afternoon, mostly clear Wednesday night,
- Mostly sunny and a bit cooler Thursday, partly cloudy Thursday night,
- Partly cloudy Friday, mostly clear Friday night,
- Then mostly sunny Saturday.
- highs 96-88 lows 66-62.
- (seasonal averages high 85 low 56).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Becoming mostly cloudy late tonight,
- Mostly cloudy start, sunny and slightly warmer Sunday afternoon, mostly cloudy Sunday night,
- AM clouds, sunny and a bit warmer Monday afternoon, partly cloudy in the evening, mostly cloudy at night,
- AM clouds, sunny and a bit cooler Tuesday, then mostly cloudy Tuesday night.
- lows 58-56 highs 75-76 cooling back to 75 Tuesday.
- Partly cloudy and a bit cooler Wednesday, partly cloudy Wednesday night,
- Partly cloudy Thursday, partly cloudy in the evening, mostly cloudy late at night,
- Then partly cloudy Friday, partly cloudy Friday night,
- Then partly cloudy and a bit warmer Saturday.
- highs 74-75 lows 55-57 cooling back to 55 Friday night.
- (seasonal averages high 68 low 53). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy and hazy this evening, partly cloudy with areas of smoke late tonight,
- Mostly sunny and a bit cooler with areas of smoke Sunday and hazy with a slight (20%) chance of afternoon and evening thunderstorms, mostly cloudy and hazy with patchy smoke late Sunday night,
- A mix of clouds and sun and a bit cooler with a slight (20%) chance of thunderstorms Monday afternoon, mostly cloudy with a slight (20%) chance of evening showers, just mostly cloudy late at night,
- Mostly sunny and a bit cooler with a slight (20%) chance of showers Tuesday, mostly cloudy with a slight (20%) chance of evening thunderstorms, then partly cloudy with a slight (20%) chance of thunderstorms late Tuesday night.
- free air freezing level 16,000 ft. tonight, 15,000 ft. Sunday and Sunday night, 14,000 ft. Monday, snow level above 8,000 ft. Monday night and Tuesday, then free air freezing level 14,000 ft Tuesday night.
- lows 59-55 highs 86-80.
- Mostly sunny and a bit cooler with a slight (20%) chance of thunderstorms Wednesday, partly cloudy Wednesday night,
- Mostly sunny and a bit cooler Thursday and Friday, partly cloudy both nights,
- Then mostly cloudy Saturday.
- free air freezing level 13,000 ft. Wednesday, 14,000 ft. Wednesday night, 13,000 ft. Thursday and Thursday night, then 14,000 ft. Friday through Saturday.
- highs 77-73 lows 53-49.
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