May
10.
Here is my weekly weather quiz question for the last time. “What is “Relative Humidity?” Here is the correct answer. Relative Humidity is a dimensionless ratio, expressed in percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature. As such, relative humidity by itself does not directly indicate the actual amount of atmospheric moisture present. See dew point.
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An Upper Level High Pressure Ridge (“Arch” shape ) is taking over giving us serious warming. The graphics for days 1-3 show a weak frontal system moving into Oregon Sunday. The graphics for days 3-7 Tuesday through Saturday show a frontal system headed into the Pacific Northwest Tuesday and a front sliding through Oregon between Thursday and next Friday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 53 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 11 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 34 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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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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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Sunny today, clear tonight,
- Sunny and a bit cooler Sunday (Mother’s Day), mostly clear at night,
- Mostly sunny and cooler Monday, then mostly clear Monday night.
- highs 85-72 lows 52-46.
- Sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Then sunny and a bit warmer Wednesday through Friday, mostly clear each night.
- highs 72-78 lows 48-52 (seasonal averages high 67 low 43)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: HIGH (21)
TREES: MODERATE (59)
WEEDS: LOW (6)
Measured 5.10.24
Data courtesy of Oregon Allergy Associates.
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Home Wood Heating Advisory:
Eugene-Springfield: GREEN- Burning wood in wood stoves or fireplaces is allowed.
Oakridge: GREEN- Burning wood in wood stoves or fireplaces is allowed.
*Pellet stoves can be used anytime since they don’t produce the particulate smoke.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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Forecast for the Umpqua Valley including Roseburg:
- Sunny and a bit cooler today, clear tonight,
- Sunny and cooler Sunday (Mother’s Day), clear at night,
- Mostly sunny and a bit cooler Monday, then mostly clear Monday night.
- highs 88-75 lows 53-49.
- Mostly sunny and a bit warmer Tuesday and Wednesday, mostly clear both nights,
- Mostly sunny Thursday, mostly clear Thursday night,
- Then mostly sunny and a bit warmer Friday.
- highs 76-82 lows 50-52. (seasonal average high 70 low 47)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Sunny and cooler today, clear this evening, mostly cloudy late tonight,
- AM clouds, sunny and a bit cooler Sunday afternoon (Mother’s Day), mostly clear in the evening, mostly cloudy late at night,
- Some AM clouds, sunny Monday afternoon, mostly clear in the evening, then partly cloudy late Monday night.
- highs 69-63 lows 48-45.
- Mostly sunny and a bit warmer Tuesday and Wednesday, mostly clear both nights,
- Then mostly sunny Thursday and Friday, mostly clear Thursday night.
- highs 63-67 cooling to 65 Friday lows near 47. (seasonal average high 60 low 47)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Sunny and a bit cooler today, clear tonight,
- Sunny and a bit cooler Sunday (Mother’s Day), mostly clear at night,
- Mostly sunny and a bit cooler Monday, mostly clear in the evening, then partly cloudy Monday night.
- free air freezing level 12,000 ft. today, 13,000 ft., tonight, 12,000 ft. Sunday, 12,000 ft. falling to 11,000 ft. Sunday night, 11,000 ft. Monday, then 12,000 ft. Monday night.
- highs 70-62 lows 45-38.
- Sunny and a bit warmer Tuesday and Wednesday, mostly clear both nights,
- Mostly sunny and a bit warmer with a slight (20%) chance of showers Thursday, mostly clear with a slight (20%) chance of showers Thursday night,
- Then sunny with a slight (20%) chance of showers Friday.
- free air freezing level 12,000 ft. Tuesday, 13,000 ft. Tuesday night, 13,000 ft. Wednesday, 14,000 ft. Wednesday night, then snow level above 8,000 ft. Thursday through Friday.
- highs 64-70 lows 42-45.
For all of your Eugene-Springfield and Lane County News, Weather, and Sports go to: EugeneDailyNews.com