May
11.
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 slowly moving to the east enhancing cooling. The graphics for days 1-3 show weak frontal waves moving across Oregon Sunday and Monday for cooling. 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 46 in the Good category measuring Ozone.
Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 22 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:
- Clear tonight,
- Sunny and a bit cooler Sunday (Mother’s Day), mostly clear Sunday night,
- Mostly sunny and a bit cooler Monday, mostly clear at night,
- Sunny and a bit warmer Tuesday, then mostly clear Tuesday night.
- lows 48-46 warming back to 48 Tuesday night highs 85-73 warming to 75 Tuesday.
- Sunny and a bit warmer Wednesday, clear Wednesday night,
- Sunny and a bit cooler Thursday and Friday, mostly clear both nights,
- Sunny and a bit warmer Saturday.
- highs 77-69 warming to 72 Saturday lows 49-43 (seasonal averages high 68 low 44)
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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:
- Clear tonight,
- Sunny and cooler Sunday (Mother’s Day), mostly clear Sunday night,
- Sunny and a bit cooler Monday, mostly clear in the evening, partly cloudy late at night,
- Some AM clouds, sunny Tuesday afternoon, then clear Tuesday night.
- lows 52-50 warming back to 52 Tuesday night highs 82-78.
- Sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Mostly sunny and a bit cooler Thursday and Friday, mostly clear both nights,
- Then mostly sunny and a bit warmer Saturday.
- highs 82-72 warming to 74 Saturday lows 53-46. (seasonal average high 70 low 47)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly clear this evening, becoming mostly cloudy late tonight,
- AM clouds, sunny and a bit warmer Sunday afternoon (Mother’s Day), partly cloudy late Sunday night,
- Some AM clouds, sunny Monday afternoon, partly cloudy late at night,
- Mostly sunny and a bit warmer Tuesday, then mostly clear Tuesday night.
- lows 48-46 warming back to 48 Tuesday night highs 63-64.
- Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Mostly sunny and a bit cooler Thursday and Friday, mostly clear both nights,
- Then mostly sunny and a bit warmer Saturday.
- highs 66-62 warming to warming to 64 Saturday lows 47-44. (seasonal average high 60 low 47)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Clear tonight,
- Sunny and a bit cooler Sunday (Mother’s Day), mostly clear Sunday night,
- Mostly sunny and a bit cooler Monday, partly cloudy at night,
- Sunny and a bit warmer Tuesday, then clear Tuesday night.
- free air freezing level 13,000 ft. tonight, 12,000 ft. Sunday, 12,000 ft. falling to 11,000 ft. Sunday night, 11,000 ft. Monday, 12,000 ft. Monday night, then 13,000 ft. Tuesday and Tuesday night.
- lows 45-38 warming to 42 Tuesday night highs 69-63 warming to 65 Tuesday.
- Sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Mostly sunny and a bit cooler with a slight (20%) chance of rain and snow showers Thursday, becoming mostly clear at night,
- Mostly sunny and a bit cooler with a slight (20%) chance of showers Friday, mostly cloudy Friday night,
- Then sunny with a slight (20%) chance of showers and a bit warmer Saturday.
- free air freezing level 13,000 ft. Wednesday and Wednesday night, snow level 7,000 ft. Thursday, free air freezing level 12,000 ft,. Thursday night, snow level 6,000 ft. Friday, free air freezing level 11,000 ft. Friday night, then snow level 6,000 ft. Saturday.
- highs 68-57 warming to 62 Saturday lows 42-35.
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