Apr
07.
Here is my weekly weather quiz question for the last time. “What is a “Radiosonde?” Here is the correct answer. A Radiosonde is an instrument that is carried aloft by a balloon to send back information on atmospheric temperature, pressure and humidity by means of a small, expendable radio transmitter. Radiosondes can be tracked by radar, radio direction finding, or navigation systems (such as the satellite Global Positioning System) to obtain wind data. See also rawinsonde.
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A strong Upper Level Low Pressure Trough (“U” shape) is moving through the Pacific Northwest to be followed by a building Upper Level High Pressure Ridge next week. The graphics for days 1-3 show a frontal system moving into the Pacific Northwest early Monday. The graphics for days 3-7 Wednesday through Sunday show frontal systems moving over the Pacific Northwest Wednesday and Friday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 8 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 4 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 4 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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ADVISORIES:
- A FLOOD WARNING IS IN EFFECT UNTIL LATE FRIDAY EVENING FOR THE OWYHEE RIVER BELOW THE OWYHEE DAM AFFECTING MALHEUR COUNTY.
- A FROST ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 9 AM MONDAY ABOVE 1,000 FT. FOR THE UPPER HOOD RIVER VALLEY.
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 cloudy this evening, partly cloudy late tonight,
- Mostly sunny and a bit warmer Monday, mostly cloudy Monday night,
- AM clouds, a mix of clouds sun and a bit warmer Tuesday afternoon, partly cloudy at night,
- Mostly sunny and a bit warmer Wednesday, then partly cloudy Wednesday night.
- lows 38-45 cooling to 39 Tuesday night warming to 40 Wednesday night highs 60-66.
- Mostly sunny and a bit cooler Thursday, mostly cloudy with a good (50%) chance of rain Thursday night,
- Mostly cloudy and cooler rain likely (70%) Friday, a good (50%) chance of rain at night,
- A mix of clouds and sun and a bit warmer with a good (50%) chance of rain Saturday, mostly cloudy with a good (50%) chance of rain Saturday night,
- Then a mix of clouds and sun and a bit warmer with a (40%) chance of rain Sunday.
- highs 65-55 warming to 58 Sunday lows 42-38. (seasonal averages high 60 low 39)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: MODERATE (55)
WEEDS: ABSENT (0)
Measured 4.6.24
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:
- Mostly cloudy with a slight (20%) chance of early evening rain, just mostly cloudy late tonight (under 0.10 in. of rain possible),
- AM clouds, partly cloudy and a bit warmer Monday afternoon, partly cloudy Monday night,
- Mostly cloudy with patchy AM fog, partly cloudy and a bit warmer Tuesday afternoon, just partly cloudy at night,
- Partly cloudy and a bit warmer Wednesday, then partly cloudy Wednesday night.
- lows 39-43 cooling to 42 Tuesday night and Wednesday night highs 63-72.
- Partly cloudy and a bit cooler Thursday, mostly cloudy with a (30%) chance of rain Thursday night,
- Mostly cloudy and cooler with a good (50%) chance of rain and snow Friday, a (40%) chance of rain and snow at night,
- Mostly cloudy and a bit warmer with a (40%) chance of rain and snow Saturday, a slight (20%) chance of rain Saturday night,
- Mostly cloudy with a slight (20%) chance of AM rain and snow, then partly cloudy and a bit warmer with a slight (20%) chance of rain Sunday afternoon.
- highs 68-55 warming to 60 Sunday lows 42-38 warming to 40 Saturday night. (seasonal averages high 61 low 41)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with a slight (20%) chance of early evening rain, just mostly cloudy late tonight,
- Some AM clouds, partly cloudy and a bit warmer Monday afternoon, partly cloudy in the evening, mostly cloudy late Monday night,
- Mostly cloudy with patchy AM fog, partly cloudy and a bit warmer Tuesday afternoon, partly cloudy at night,
- Partly cloudy and a bit warmer Wednesday, then partly cloudy Wednesday night.
- lows 38-44 cooling to 42 Tuesday night and Wednesday night highs 58-62.
- Partly cloudy and a bit cooler Thursday, mostly cloudy with a (40%) chance of rain Thursday night,
- Mostly cloudy and a bit cooler with a good (50%) chance of rain Friday, a (40%) chance of rain at night,
- Mostly cloudy and a bit warmer with a (40%) chance of rain Saturday, a slight (20%) chance of rain Saturday night,
- Mostly cloudy with a slight (20%) chance of AM rain, then partly cloudy and a bit warmer with a slight (20%) chance of rain Sunday afternoon.
- highs 58-53 warming to 57 Sunday lows 42-40. (seasonal average high 56 low 43)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy with a good (50%) chance of evening rain and show showers, just mostly cloudy late tonight (under 0.10 in. of rain possible),
- Mostly sunny and a bit warmer Monday, partly cloudy Monday night,
- Mostly sunny and a bit warmer with a slight (20%) chance of showers Tuesday, partly cloudy at night,
- Mostly sunny and warmer Wednesday, partly cloudy in the evening, then mostly clear Wednesday night.
- snow level 3,500 ft. tonight, free air freezing level 4,000 ft. rising to 6,000 ft. Monday afternoon, 6,000 ft. Monday night, snow level 6,000 ft. Tuesday, then 8,000 ft. Tuesday night,
- lows 25-32 cooling to 30 Tuesday night warming to 35 Wednesday night highs 46-59.
- Mostly sunny and a bit cooler Thursday, mostly cloudy with a good (50%) chance of rain and snow Thursday night,
- Mostly cloudy and cooler with snow and rain likely (70%) Friday, snow and rain likely (70%) at night,
- Mostly cloudy with a good (50%) chance of AM snow and rain, partly cloudy and a bit cooler with a good (50%) chance of snow and rain Saturday afternoon, mostly cloudy with a good (50%) chance of snow and rain Saturday night,
- A mix of clouds and sun and a bit warmer with a good (50%) chance of snow and rain Sunday.
- free air freezing level 10,000 ft. Thursday, snow level 5,500 ft. Thursday night, 4,000 ft. Friday, 3,000 ft. Friday night, then 3,500 ft. Saturday through Sunday.
- highs 57-38 warming to 43 Sunday lows 32-27.
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