Jul
20.
The Jet Stream gives us onshore airflow. The graphics for days 1-3 show a weak cold frontal system moving from the northwest of us slicing southeastward through the Pacific Northwest. The graphics for days 3-7 Thursday through Monday show no frontal systems to the west of us or moving through the Pacific Northwest.
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ADVISORIES:
- NONE AT THIS TIME.
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 29 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 18 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 24 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: 12 MODERATE
TREES: 0 ABSENT
WEEDS: 0 ABSENT
Measured 7.17.25
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:
- AM clouds, mostly sunny and a bit warmer this afternoon, partly cloudy this evening, clear late tonight,
- Sunny and a bit warmer Tuesday, clear at night,
- Sunny and a bit warmer Wednesday, then mostly clear Wednesday night.
- highs 79-88 lows 52-54.
- Sunny Thursday, mostly clear Thursday night,
- Sunny and a bit cooler Friday and Saturday, mostly clear both nights,
- Then sunny and a bit warmer Sunday.
- highs 88-85 warming to 87 Sunday lows 53-52. (seasonal averages high 86 low 52).
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Forecast for the Umpqua Valley including Roseburg:
- AM clouds, sunny and a bit cooler this afternoon, mostly clear tonight,
- Sunny and a bit warmer Tuesday, clear at night,
- Mostly sunny and a bit warmer Wednesday, then mostly clear Wednesday night.
- highs 80-89 lows 57-59.
- Mostly sunny Thursday, mostly clear Thursday night,
- Mostly sunny and a bit cooler Friday and Saturday, mostly clear both nights,
- Then mostly sunny Sunday.
- highs 89-87 lows 59-57. (seasonal averages high 87 low 58).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- AM clouds, sunny and a bit warmer this afternoon, partly cloudy this evening, mostly cloudy late tonight,
- AM clouds, sunny Tuesday afternoon, mostly clear in the evening, mostly cloudy late at night,
- Partly cloudy and a bit warmer Wednesday, then partly cloudy Wednesday night.
- highs 69-70 lows 52-54.
- Mostly cloudy and a bit cooler Thursday, mostly cloudy Thursday night,
- Partly cloudy Friday and Friday night,
- Partly cloudy Saturday, mostly clear in the evening, partly cloudy late Saturday night,
- Some AM clouds, then Sunday.
- highs near 69 lows 53-52.
- (seasonal averages high 67 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly sunny with a slight (20%) chance of AM showers, mostly sunny and a bit warmer this afternoon, partly cloudy this evening, clear late tonight,
- Then sunny and a bit warmer Tuesday and Wednesday, mostly clear both nights,
- snow level above 8,000 ft. today, free air freezing level 12,000 ft. tonight, 12,000 ft. rising to 13,000 ft. Tuesday afternoon, 13,000 ft. Tuesday night and Wednesday, then 14,000 ft. Wednesday night.
- highs 65-76 lows 44-50.
- Sunny and a bit warmer Thursday, mostly clear Thursday night,
- Sunny and a bit cooler Friday, mostly clear at night,
- Sunny and a bit cooler Saturday, mostly clear in the evening, partly cloudy late Saturday night,
- Then sunny Sunday.
- free air freezing level 14,000 ft. Thursday through Friday night, 13,000 ft. Saturday, 14,000 ft. Saturday night, then 13,000 ft. Sunday.
- highs 77-75 lows 48-48.
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