Aug
02.
An Upper Level Low Pressure Trough (“U “Shape) keeps up the onshore airflow to control temperatures. The graphics for days 1-3 show no frontal systems moving into the Pacific Northwest. The graphics for days 3-7 Tuesday through Saturday show a frontal system on the way to Oregon between Thursday and Friday.
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ADVISORIES:
- A RED FLAG WARNING FOR LIGHTNING IS IN UNTIL 8 PM MDT TONIGHT FOR THE SOUTHERN GRASSLANDS, THE CENTRAL CANYONLANDS, AND THE NORTHWESTERN VALE BLM.
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 31 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 20 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: 5 MODERATE
TREES: 2 LOW
WEEDS: 0 ABSENT
Measured 7.31.25
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 clear this evening, partly cloudy late tonight,
- Mostly sunny and a bit cooler Sunday, partly cloudy Sunday night,
- Sunny Monday, mostly clear in the evening, partly cloudy late at night,
- Mostly sunny and a bit warmer Tuesday, then partly cloudy Tuesday night.
- lows 52-57 highs 82-85.
- AM cloudy, a mix of clouds and sun and a bit cooler Wednesday afternoon, mostly cloudy Wednesday night,
- AM clouds, mostly sunny and a bit warmer Thursday afternoon, mostly cloudy in the evening, partly cloudy late at night,
- Then sunny and a bit warmer Friday and Saturday, mostly clear Friday night.
- highs 83-95 lows near 57. (seasonal averages high 86 low 52).
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Forecast for the Umpqua Valley including Roseburg:
- Mostly clear tonight,
- Partly cloudy and a bit cooler Sunday, partly cloudy Sunday night,
- Some AM clouds, sunny Monday afternoon, mostly clear in the evening, partly cloudy late at night,
- Sunny and a bit warmer Tuesday, then partly cloudy Tuesday night.
- lows 57-55 warming to 62Tuesday night highs 82-88.
- Partly cloudy and a bit cooler Wednesday, partly cloudy Wednesday night,
- Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit warmer Thursday afternoon, partly cloudy at night,
- Mostly sunny and a bit warmer Friday, mostly clear Friday night,
- Then sunny and a bit warmer Saturday.
- highs 85-95 lows 62-60. (seasonal averages high 88 low 58).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with patchy fog late tonight,
- AM clouds with patchy fog, partly cloudy and a bit warmer Sunday afternoon, mostly cloudy Sunday night,
- AM clouds, sunny and a bit warmer Monday afternoon, partly cloudy at night,
- Partly cloudy and a bit warmer Tuesday, then mostly cloudy Tuesday night.
- lows 54-53 warming to 58 Tuesday night highs 69-74.
- Mostly cloudy and a bit warmer Wednesday, mostly cloudy Wednesday night,
- AM clouds with a slight (20%) chance of showers, just mostly cloudy Thursday afternoon, mostly cloudy at night,
- Mostly cloudy start, sunny Friday afternoon, mostly clear Friday night,
- Then mostly sunny and a bit warmer Saturday.
- highs 74-78 lows 58-55.
- (seasonal averages high 67 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly clear tonight,
- Mostly sunny and a bit cooler with a slight (20%) chance of showers Sunday afternoon, partly cloudy with slight (20%) chance of evening showers, just partly cloudy Sunday night,
- Sunny and a bit cooler Monday, mostly clear in the evening, partly cloudy late at night,
- Sunny and a bit warmer Tuesday, then partly cloudy Tuesday night.
- free air freezing level 13,000 ft. tonight, snow level above 8,000 ft. Sunday and Sunday night, free air freezing level 12,000 ft. Monday, then 13,000 ft. Monday night through Tuesday night.
- lows 47-43 warming to 46 Tuesday night highs 70-68 warming to 72 Tuesday.
- Mostly sunny and a bit cooler Wednesday, mostly cloudy Wednesday night,
- Mostly sunny and a bit warmer Thursday, mostly cloudy at night,
- Then sunny and a bit warmer Friday and Saturday, mostly clear Friday night,
- free air freezing level 14,000 ft. Wednesday through Thursday, 15,000 ft. Wednesday night, 14,000 ft. Thursday, 15,000 ft. Thursday night and Friday, 16,000 ft. Friday night, then 15,000 ft. Saturday.
- highs 70-82 lows 47-50.
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