Jul
28.
Here is my weekly weather quiz question for the last time. “What is a “Sling Psychometer?” Here is the correct answer. A Sling Psychrometer is an instrument used to measure the water vapor content of the atmosphere in which wet and dry bulb thermometers are mounted on a frame connected to a handle at one end by means of a bearing or a length of chain. The psychrometer is whirled by hand to provide the necessary ventilation to evaporate water from the wet bulb.
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An Upper Level Low Pressure Trough is sliding down from Canada. The graphics for days 1-3 show a frontal system that will push through Monday followed by another wave Tuesday. The graphics for days 3-7 Wednesday through Sunday show a cold frontal system moving through the Pacific Northwest next Saturday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 54 in the Moderate category measuring Particulate Matter.
Oakridge: The Air Quality Index is 118 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 39 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA.org)
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ADVISORIES:
- AN AIR QUALITY ALERT IS IN EFFECT UNTIL NOON MONDAY FOR KLAMATH COUNTY AND LAKE COUNTY.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL NOON MONDAY FOR DESCHUTES, GRANT, AND WHEELER COUNTIES.
- AN AIR QUALITY ADVISORY IS IN EFFECT UNTIL NOON MONDAY FOR BAKER, HARNEY, AND MALHEUR COUNTIES.
- AN AIR QUALITY ALERT IS IN EFFECT UNTIL 10 PM TONIGHT FOR JACKSON COUNTY.
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:
- Mostly clear this evening, partly cloudy late tonight,
- A mix of clouds and sun with a slight (20%) chance of AM rain, just mostly cloudy Monday afternoon, mostly cloudy Monday night,
- Mostly cloudy start, becoming mostly sunny and a bit warmer Tuesday afternoon, mostly clear at night,
- Sunny and a bit warmer Wednesday, then mostly clear Wednesday night.
- lows 56-60 cooling back to 56 Tuesday night warming to 59 Wednesday night highs 79-92.
- Sunny and a bit warmer Thursday, mostly clear Thursday night,
- Sunny Friday, mostly clear at night,
- Then sunny and a bit cooler Saturday and Sunday, mostly clear Saturday night.
- highs 96-94 lows 59-56. (seasonal averages high 86 low 53)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: MODERATE (5)
TREES: ABSENT (0)
WEEDS: ABSENT (0)
Last Measured 7.25.24
Data courtesy of Oregon Allergy Associates.
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Forecast for the Umpqua Valley including Roseburg:
- Mostly clear with patchy fog late tonight,
- Partly cloudy with a slight (20%) chance of AM rain, mostly cloudy Monday afternoon, just mostly cloudy late Monday night,
- Mostly cloudy start, sunny and a bit cooler Tuesday afternoon, mostly clear at night,
- Mostly sunny and a bit warmer Wednesday, then mostly clear Wednesday night.
- lows 59-64 cooling to 62 Tuesday night warming back to 64 Wednesday night highs 85-94.
- Mostly sunny and a bit warmer Thursday, mostly clear Thursday night,
- Mostly sunny Friday, mostly clear at night,
- Mostly sunny and a bit cooler Saturday, mostly clear Saturday night,
- Then mostly sunny Sunday.
- highs 93-97 cooling to 95 Saturday lows near 63 (seasonal averages high 88 low 59)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Partly cloudy with patchy evening coastal fog lasting overnight and a slight (20%) chance of coastal rain late tonight while mostly cloudy patchy inland fog late tonight,
- Mostly cloudy with a slight (20%) chance of AM rain, just mostly cloudy and a bit cooler Monday afternoon, cloudy with patchy fog Monday night,
- Mostly cloudy start, partly cloudy Tuesday afternoon, partly cloudy at night,
- Partly cloudy and a bit warmer Wednesday, then partly cloudy Wednesday night.
- lows 56-58 cooling to 55 Wednesday night highs 73-76.
- Partly cloudy Thursday and Thursday night,
- Partly cloudy and a bit cooler Friday, partly cloudy at night,
- Partly cloudy and a bit cooler Saturday and Saturday night,
- Some AM clouds, then sunny and a bit warmer Sunday afternoon.
- highs 76-74 warming back to 76 Sunday lows near 55. (seasonal average high 67 low 54)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly clear with evening haze and areas of smoke, partly cloudy and hazy late tonight,
- Mostly sunny with AM haze, mostly cloudy with a slight (20%) chance of rain Monday afternoon, cloudy with a slight (20%) chance of rain Monday night,
- AM clouds, sunny and a bit cooler Tuesday afternoon, mostly clear at night,
- Sunny and warmer Wednesday, then mostly clear Wednesday night.
- free air freezing level 14,000 ft. tonight, snow level above 8,000 ft. Monday and Monday night, free air freezing level 14,000 ft. rising to 15,000 ft. Tuesday afternoon, 16,000 ft. rising to above 16,000 ft. Tuesday night, then above 16,000 ft. Wednesday and Wednesday night.
- lows 45-53 highs near 69-79.
- Sunny and a bit warmer Thursday, mostly clear Thursday night,
- Sunny Friday, partly cloudy at night,
- Sunny Saturday, mostly clear Saturday night,
- Then sunny and a bit cooler Sunday.
- free air freezing level 16,000 ft. Thursday, above 16,000 ft. Thursday night and Friday, then 16,000 ft. Friday night through Sunday.
- highs 87-84 lows near 55.
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