Aug
15.
An Upper Level Low Pressure Trough (“U”Shape) moves through overnight and early this AM (along with a surface cold front). Then an Upper Level High Pressure Ridge takes over bringing sunshine and warmer temperatures.The graphics for days 1-3 show a cold frontal system moving through the Pacific Northwest by this morning. The graphics for days 3-7 Tuesday through Saturday show a cold front moving through by early Tuesday and then another cold front falls apart as it pushes through Wednesday.
ADVISORIES:
- A FLASH FLOOD WATCH IS IN EFFECT FROM THIS MORNING THROUGH THIS EVENING FOR THE SOUTHERN BLUE MOUNTAINS OF OREGON, JOHN DAY BASIN, OCHOCO, AND THE JOHN DAY HIGHLANDS.
- A FLASH FLOOD WATCH IS IN EFFECT FROM THIS AFTERNOON THROUGH THIS EVENING FOR HARNEY COUNTY, BAKER COUNTY, MALHEUR COUNTY, AND THE OREGON LOWER TREASURE VALLEY.
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.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 11 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 6 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 10 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA.org)
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Eugene-Springfield Area Pollen count:
GRASS: 2 LOW
TREES: 0 ABSENT
WEEDS: 0 ABSENT
Measured 8.14.25
Data courtesy of Oregon Allergy Associates.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Mostly cloudy with a good (50%) chance of AM showers (0.10 in. of rain possible), mostly sunny this afternoon, partly cloudy tonight,
- Mostly sunny and a bit warmer Sunday, mostly cloudy late at night,
- Mostly sunny Monday, then mostly clear Monday night.
- highs 80-82 lows 55-52.
- Sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Sunny and a bit warmer Wednesday and Thursday, clear both nights,
- Then sunny and a bit warmer Friday.
- highs 84-90 lows 53-54. (seasonal averages high 84 low 52).
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Forecast for the Umpqua Valley including Roseburg:
- Mostly cloudy with AM showers likely (70%), a bit cooler with a slight (20%) chance of showers this afternoon, partly cloudy with a slight (20%) chance of evening showers, just mostly cloudy late tonight,
- Some AM showers, sunny and a bit warmer Sunday afternoon, partly cloudy at night,
- Partly cloudy Monday, mostly clear Monday night.
- highs 78-83 lows 60-56.
- Mostly sunny and a bit warmer Tuesday, clear Tuesday night,
- Then sunny Wednesday, Thursday, and Friday, clear each night.
- highs near 87-93 lows 57-59 cooling back to 57 Thursday night (seasonal averages high 86 low 57).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Cloudy with a good (50%) chance of AM coastal showers and just partly cloudy and a bit cooler this afternoon while AM inland showers likely (70%) and a bit cooler with a slight (20%) chance of inland showers this afternoon, just partly cloudy tonight,
- Some AM clouds, sunny Sunday afternoon, mostly cloudy at night,
- AM clouds, sunny and a bit warmer Monday afternoon, then mostly clear Monday night.
- highs 72-73 lows 55-53.
- Mostly sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Mostly sunny Wednesday and Thursday, mostly clear both nights,
- Then sunny Friday.
- highs 75-74 lows near 54.
- (seasonal averages high 67 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy with AM rain, mostly cloudy and a bit cooler with a good (50%) chance of showers and a slight (20%) chance of thunderstorms this afternoon (0.50 in. of rain possible), mostly cloudy with a slight (20%) chance of evening showers, just mostly cloudy late tonight,
- AM clouds and sun, sunny and a bit warmer Sunday afternoon, partly cloudy at night,
- Mostly sunny Monday, then mostly clear Monday night.
- snow level above 8,000 ft. today and tonight, free air freezing level 13,000 ft. Sunday, then snow level above 8,000 ft. Sunday night.
- highs 62-70 lows 46-47 Saturday night cooling to 45 Sunday night.
- Sunny and a bit warmer Tuesday, Wednesday, and Thursday, mostly clear each night,
- Then sunny and a bit warmer Friday.
- free air freezing level 14,000 ft. Tuesday, 13,000 ft. Tuesday night, 14,000 ft. Wednesday, Wednesday night and Thursday, then 16,000 ft. Thursday through Friday.
- highs 72-83 lows 46-52.
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