Apr
05.
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 into 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 approaching the Pacific Northwest today and tonight. The graphics for days 3-7 Tuesday through Saturday 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 15 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 9 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 10 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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ADVISORIES:
- A WINTER STORM WARNING IS IN EFFECT UNTIL 11 AM TODAY FOR WALLOWA COUNTY AND THE NORTHERN BLUE MOUNTAINS OF OREGON.
- A FLOOD WARNING IS IN EFFECT THROUGH LATE WEDNESDAY MORNING FOR THE OWYHEE RIVER BELOW THE OWYHEE DAM AFFECTING MALHEUR COUNTY.
- A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL NOON MDT TODAY FOR MALHEUR 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 cloudy with a (40%) chance of AM showers, showers and a bit cooler this afternoon (0.25 in., of rain possible) and this evening, a slight (20%) chance of showers with patchy fog late tonight (under 0.10 in., of rain possible),
- Patchy AM fog, a mix of clouds and sun and a bit warmer with a good (50%) chance of showers Sunday afternoon (under 0.10 in. of rain possible), mostly cloudy with patchy fog late Sunday night,
- Patchy AM fog, mostly sunny and a bit warmer Monday, partly cloudy in the evening, then mostly clear with patchy fog late Monday night.
- highs 52-60 lows 40-38 warming back to 40 Monday night.
- Mostly sunny and a bit warmer Tuesday, partly cloudy Tuesday night,
- A mix of clouds and sun and a bit warmer Wednesday, partly cloudy at night,
- Mostly sunny and a bit warmer Thursday, partly cloudy Thursday night,
- Then mostly sunny and a bit cooler with a slight (20%) chance of showers Friday.
- highs 60-70 lows 39-43. (seasonal averages high 59 low 39)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: MODERATE (25)
WEEDS: ABSENT (0)
Measured 4.5.24
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 good (50%) chance of AM rain and snow, a good (50%) chance of rain this afternoon (under 0.10 in., of rain possible, snow level 2,000 ft. rising to 3,000 ft), evening rain likely (70%), a good (50%) chance of rain and snow late tonight (under 0.10 in. of rain possible, snow level 3,000 ft., no snow accumulation expected),
- Mostly cloudy with a (40%) chance of AM rain and snow, a (40%) chance of rain and a bit warmer Sunday afternoon (under 0.10 in. of rain possible), a slight (20%) chance of evening rain ,just mostly cloudy late at night,
- AM clouds, sunny and a bit warmer Monday afternoon, then mostly clear Monday night.
- highs 52-63 lows near 40.
- Mostly sunny and a bit warmer Tuesday, just partly cloudy Tuesday night,
- Partly cloudy and a bit warmer Wednesday and Thursday, partly cloudy both nights,
- Then partly cloudy with a slight (20%) chance of showers Friday.
- highs 68-74 cooling back to 68 Friday lows 44-46. (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 coastal rain and a bit warmer today while a (40%) chance of AM inland rain with inland rain likely (70%) and a bit warmer this afternoon (0.25 in. of rain possible), coastal rain tonight while inland rain likely (70%) late tonight (0.10 in. of rain possible),
- Mostly cloudy and a bit warmer with a (40%) chance of rain Sunday (under 0.10 in. of rain possible), mostly cloudy in the evening at the shore and partly cloudy with a slight (20%) chance of coastal rain late at night while a slight (20%) chance of evening inland rain and just partly cloudy inland late at night,
- AM clouds, sunny and a bit warmer Monday afternoon, then mostly clear Monday night.
- highs 52-58 lows 40-42.
- Partly cloudy and a bit warmer Tuesday, partly cloudy Tuesday night,
- Mostly cloudy start, partly cloudy and a bit warmer Wednesday afternoon, partly cloudy at night,
- Partly cloudy Thursday and Thursday night,
- Mostly cloudy with a slight (20%) chance of AM showers, then just partly cloudy and a bit cooler Friday afternoon.
- highs 60-63 cooling back to 60 Friday lows near 45. (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 AM snow showers, a bit cooler with snow showers and rain showers this afternoon (0.25 in. of rain possible, 1 in. of snow possible), snow and rain showers tonight (0.25 in. of rain possible, 1 in. of snow possible),
- Mostly cloudy with AM snow showers likely (70%) and a good (50%) chance of rain showers, a bit warmer with snow showers and rain showers likely (70%) Sunday afternoon, a good (50%) chance of evening show showers and a slight (20%) chance of rain showers, just partly cloudy late at night,
- Mostly sunny and a bit warmer Monday, then mostly clear late Monday night.
- snow level 2,000 ft. rising to 3,500 ft. this afternoon, 3,000 ft. tonight through Sunday night, 4,500 ft. Monday, then 7,000 ft. Monday night.
- highs 36-46 lows 26-24 warming to 30 Monday night.
- Sunny and a bit warmer Tuesday, partly cloudy Tuesday night,
- Mostly sunny and a bit warmer Wednesday, partly cloudy at night,
- Mostly sunny and a bit warmer Thursday, partly cloudy with a slight (20%) chance of showers Thursday night,
- Then mostly cloudy and a bit cooler with a slight (20%) chance of showers Friday.
- free air freezing level 8,000 ft. Tuesday, 9,000 ft. Tuesday night, 10,000 ft. Wednesday, 11,000 ft. Wednesday night and Thursday, snow level 7,500 ft. Thursday night, then 6,500 ft. Friday.
- highs 54-63 cooling to 55 Friday lows 33-37.
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