Apr
25.
Here is my weekly weather quiz question “What is a “Rear Flank Downdraft?”
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An Upper Level Low Pressure Trough (“U” shape) is taking over bringing valley rain and mountain snow. The graphics for days 1-3 show the frontal system sliding into the Pacific Northwest Thursday. The graphics for days 3-7 Monday through Friday show the frontal system moving across the Pacific Northwest between Sunday and Monday and then another front offshore that pushes in next Thursday.
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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 17 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 3 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 FURTHER NOTICE FOR THE OWYHEE RIVER BELOW THE OWYHEE DAM AFFECTING MALHEUR COUNTY.
- A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL MIDNIGHT TONIGHT ABOVE 4,500 FT. FOR THE NORTH OREGON CASCADES, THE CASCADES OF MARION AND LINN COUNTIES, AND THE CASCADES OF LANE COUNTY.
- A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 2 PM TODAY ABOVE 5,000 FT. FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.
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 showers and a bit cooler today (0.50 in. of rain possible), a good (50%) chance of evening showers, a (30%) chance of showers late tonight (under 0.10 in. of rain possible),
- Mostly cloudy with a slight (20%) chance of AM showers, showers likely (70%) and a bit warmer Saturday afternoon and evening (under 0.10 in. of rain possible), a good (50%) chance of rain late at night (under 0.10 in. of rain possible),
- Mostly cloudy with showers likely (70%) and a bit warmer Sunday, then a good (50%) chance of showers Sunday night.
- highs 56-59 lows 43-47 cooling to 42 Sunday night.
- A mix of clouds and sun and a bit cooler with a good (50%) chance of showers Monday, partly cloudy with a slight (20%) chance of showers Monday night,
- Mostly sunny and a bit warmer with a slight (20%) chance of showers Tuesday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers late at night,
- A mix of clouds and sun with a good (50%) chance of AM showers, mostly cloudy with a good (50%) chance of showers Wednesday afternoon and Wednesday night,
- AM clouds and sun with a good (50%) chance of showers, then mostly cloudy with a good (50%) chance of showers Thursday afternoon.
- highs 62-59 warming back t0 62 Tuesday and Wednesday lows 44-39 (seasonal averages high 64 low 41)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: HIGH (266)
WEEDS: LOW (3)
Measured 4.25.24
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 rain today (0.25 in. of rain possible) and this evening, a slight (20%) chance of rain late tonight (under 0.10 in. of rain possible),
- Mostly cloudy with a slight (20%) chance of AM rain, rain likely (70%) and a bit cooler Saturday afternoon, evening rain likely (70%), a good (50%) chance of rain late at night (under 0.10 in. of rain possible),
- Mostly cloudy with a good (50%) chance of AM rain, showers likely (70%) and a bit warmer Sunday afternoon, then mostly cloudy with a (30%) chance of showers Sunday night.
- highs 56-62 lows 43-46 cooling to 44 Sunday night.
- Mostly cloudy with a (30%) chance of AM rain and snow showers, a (30%) chance of showers Monday afternoon, partly cloudy with a slight (20%) chance of showers Monday night,
- Partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday and at night,
- Mostly cloudy and a bit cooler with a (30%) chance of showers Wednesday, a (40%) chance of showers Wednesday night,
- Mostly cloudy with a good (50%) chance of AM showers, then showers likely (70%) Thursday afternoon.
- highs 62-69 cooling back to 62 Thursday lows 39-45. (seasonal averages high 66 low 44)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with AM rain, rain likely (70%) this afternoon (0.25 in. of rain possible), a (40%) chance of evening rain, a slight (20%) chance of rain late tonight,
- Mostly cloudy with a slight (20%) chance of AM rain, rain likely (70%) Saturday afternoon, cloudy with evening rain likely (70%), a good (50%) chance of rain late Saturday night (under 0.10 in. of rain possible),
- Mostly cloudy with AM rain likely (70%), a good (50%) chance of rain Sunday afternoon, then a (40%) of showers Sunday night.
- highs near 56 lows 44-47 cooling to 42 Sunday night.
- Mostly cloudy with a (40%) chance of AM showers, partly cloudy and a bit warmer with a (50%) chance of showers Monday afternoon, partly cloudy with a slight (20%) of showers Monday night,
- Partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday and in the evening, mostly cloudy with a slight (20%) chance of showers late at night,
- Mostly cloudy and a bit cooler with a (40%) chance of showers Wednesday and Wednesday night,
- Then mostly cloudy and a bit cooler with a good (50%) chance of showers Thursday.
- highs 57-60 cooling back 57 Thursday lows 38-42. (seasonal average high 58 low 45)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy and a bit cooler with rain and snow showers today (0.50 in. of rain possible, 1 in. of snow possible), evening rain and snow showers, snow showers likely (70%) with a good (50%) chance of rain showers late tonight (0.25 in. of rain possible, little or no snow accu0mulation expected),
- Mostly cloudy with a (40%) chance of AM snow showers and a slight (20%) chance of rain showers, rain showers with snow showers likely (70%) and a bit warmer with rain and snow showers likely (70%) Saturday afternoon, rain and snow showers Saturday night,
- Mostly cloudy and a bit warmer with rain and snow showers likely (70%) Sunday, then rain and snow showers likely (70%) Sunday night.
- snow level 4,500 ft. today, 4,000 ft. tonight, 4,000 ft. rising to 5,000 ft. Saturday afternoon, 5,500 ft. Saturday night, 5,000 ft. Sunday, then 4,000 ft. Sunday night.
- highs 39-46 lows 32-34 cooling to 30 Sunday night.
- Mostly cloudy with a good (50%) chance of AM rain and snow showers, partly cloudy and a bit cooler with a good (50%) chance of rain and snow showers Monday afternoon, mostly cloudy with slight (20%) chance of evening rain and snow showers, partly cloudy with a slight (20%) chance of rain and snow showers late Monday night,
- Mostly sunny and warmer with a (30%) chance of rain and snow showers Tuesday, partly cloudy with a slight (20%) chance of evening rain and snow showers, mostly cloudy with a slight (20%) chance of rain and snow showers at night,
- A mix of clouds and sun and a bit warmer with a good (50%) chance of rain and snow showers Wednesday and Wednesday night,
- Then mostly cloudy and cooler with rain and snow showers likely (70%).
- snow level 3,500 ft. Monday and Monday night, 4,500 ft. Tuesday, 5,000 ft. Tuesday night, 5.500 ft. Wednesday, 5,000 ft. Wednesday night, then 4,500 ft. Thursday.
- highs 43-55 cooling to 46 Thursday lows 27-34 cooling to 32 Wednesday night.
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