Mar
16.
Here is my new weekly weather quiz question for the last time. “What is a “Psychrometer?” Here is the correct answer. A Psychrometer is an instrument used to measure the water vapor content of the air; a hygrometer consisting essentially of two similar thermometers with the bulb of one being kept wet so that the cooling that results from evaporation makes it register a lower temperature than the dry one and with the difference between the readings constituting a measure of the dryness of the atmosphere.
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An Upper Level High Pressure Ridge (“Arch” shape) is strengthening and has taken over with warmer and dry weather. The graphics for days 1-3 show a frontal system approaching the Pacific Coast today. The graphics for days 3-7 Wednesday through Sunday show the frontal system that pushes through the Pacific Northwest Wednesday and next Sunday.
Note: The Vernal Equinox takes place next Tuesday March 19th at 8:06 pm to begin the season of Spring.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 33 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 52 in the Moderate 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:
- Mostly sunny and a bit cooler this afternoon (St. Patrick’s Day), mostly clear tonight,
- Some AM clouds, mostly sunny and a bit warmer Monday afternoon, mostly clear Monday night,
- AM clouds and sun, sunny and a bit cooler Tuesday afternoon, then partly cloudy Tuesday night (Vernal Equinox 8:06 pm, Spring Begins).
- highs 70-73 cooling to 66 Tuesday lows 43-46 cooling back to 43 Tuesday night.
- Mostly cloudy and a bit cooler with a (40%) chance of rain Wednesday, a good (50%) chance of rain Wednesday night,
- Mostly cloudy a bit cooler with with a good (50%) chance of rain Thursday and at night,
- Mostly cloudy and a bit cooler with rain likely (70%) Friday and Friday night,
- Mostly cloudy and a bit cooler with rain Saturday.
- highs 59-53 lows near 42. (seasonal averages high 57 low 37)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: VERY HIGH (516)
WEEDS: ABSENT (0)
Measured 3.16.24
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 (St. Patrick’s Day), clear tonight,
- Mostly sunny and a bit warmer Monday, then clear at night,
- AM clouds, sunny and a bit cooler Tuesday afternoon, mostly clear in the evening, mostly cloudy late Tuesday night (Vernal Equinox 8:06 pm, Spring Begins),
- highs 72-74 cooling to 67 Tuesday night lows 44-47 cooling to 45 Tuesday night.
- Mostly cloudy and a bit cooler with a slight (20%) chance of rain Wednesday, a slight (20%) chance of rain Wednesday night,
- Mostly cloudy and a bit cooler with a (30%) chance of rain Thursday, a (40%) chance of rain at night,
- Mostly cloudy with rain likely (70%) Friday and Friday night,
- Mostly cloudy with AM rain and snow, then rain Saturday afternoon.
- highs 63-54 lows near 43. (seasonal average high 59 low 40)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Some AM clouds, sunny and a bit cooler today (St. Patrick’s Day), mostly clear tonight,
- Some AM clouds, sunny Monday afternoon, mostly clear in the evening, mostly clear in the evening, mostly cloudy late at night,
- Mostly cloudy start, partly cloudy and a bit cooler Tuesday afternoon, partly cloudy in the evening, then mostly cloudy late Tuesday night (Vernal Equinox 8:06 pm, Spring Begins).
- highs 63-65 cooling to 59 Tuesday lows near 45.
- Mostly cloudy and a bit cooler with a slight (20%) chance of rain Wednesday, a slight (20%) chance of rain Wednesday night,
- Mostly cloudy and a bit cooler with a (30%) chance of rain Thursday, a good (50%) of showers at night,
- Mostly cloudy with rain likely (70%) Friday, rain Friday night,
- Then mostly cloudy with rain Saturday.
- highs 58-54 lows 42-44 cooling back to 42 Friday night. (seasonal average high 55 low 42)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Sunny and a bit warmer today (St. Patrick’s Day), mostly clear tonight,
- Sunny and a bit warmer Monday, mostly clear at night,
- Mostly sunny and a bit cooler Tuesday, then partly cloudy Tuesday night (Vernal Equinox 8:06 pm, Spring Begins),
- free air freezing level 10,000 ft. rising to 11,000 ft. tonight, 11,000 ft. Sunday through Monday night, then 10,000 ft. Tuesday and Tuesday night.
- highs 54-59 cooling to 57 Tuesday lows 34-36 cooling back to 34 Tuesday night.
- A mix of clouds and sun with a (40%) chance of rain and snow and a bit cooler cooler Wednesday, a good (50%) chance of rain and snow Wednesday night,
- Mostly cloudy and a bit cooler with snow likely (70%) and a good (50%) chance of rain Thursday, snow and rain likely (70%) at night.
- Mostly cloudy and a bit cooler with snow and rain Friday, snow and rain Friday night,
- Then mostly cloudy with snow and rain and a bit cooler Saturday.
- snow level 5,500 ft. Wednesday, 5,000 ft. Wednesday night, 4,500 ft. Thursday and Thursday night, 4,000 ft. Friday and Friday night, then 3,500 ft. Saturday.
- highs 46-38 lows 30-32 cooling to 29 Friday night.
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