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 Wednesday through Sunday show a frontal system a front sliding through Oregon between Thursday and Friday and another frontal system to our northwest Sunday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 28 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 33 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 40 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 and a bit cooler today (Mother’s Day), mostly clear tonight,
- Mostly sunny and a bit cooler Monday, mostly clear at night,
- Sunny and a bit warmer Tuesday, then mostly clear Tuesday night.
- highs 85-73 warming to 75 Tuesday lows 48-46 warming back to 48 Tuesday night.
- 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:
- Sunny and cooler today (Mother’s Day), mostly clear tonight,
- 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.
- highs 82-78 lows 52-50 warming back to 52 Tuesday night.
- 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 71 low 47)
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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 (Mother’s Day), partly cloudy late tonight,
- Some AM clouds, sunny Monday afternoon, partly cloudy late at night,
- Mostly sunny and a bit warmer Tuesday, then mostly clear Tuesday night.
- highs 63-64 lows 46-48.
- 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 48)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Sunny and a bit cooler today (Mother’s Day), mostly clear tonight,
- 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 12,000 ft. today, 12,000 ft. falling to 11,000 ft. tonight, 11,000 ft. Monday, 12,000 ft. Monday night, then 13,000 ft. Tuesday and Tuesday night.
- highs 69-63 warming to 65 Tuesday lows 42-38 warming back to 42 Tuesday night.
- 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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