Apr
27.
Here is my weekly weather quiz question for the last time. “What is a “Rear Flank Downdraft?” Here is the correct answer. A Rear Flank Downdraft is a region of dry air subsiding on the back side of, and wrapping around, a mesocyclone. It often is visible as a clear slot wrapping around the wall cloud. Scattered large precipitation particles (rain and hail) at the interface between the clear slot and wall cloud may show up on radar as a hook or pendant; thus the presence of a hook or pendant may indicate the presence of an RFD.
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An Upper Level Low Pressure Trough (“U” shape) sitting right over the Pacific Northwest. The graphics for days 1-3 show a frontal system sliding into the Pacific Northwest today. The graphics for days 3-7 Wednesday through Sunday show the frontal system that moved across the Pacific Northwest Tuesday, then another front offshore that pushes in between Thursday and Friday. A frontal system will be poised offshore next Saturday and pushing into Oregon.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 12 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 13 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 WEATHER ADVISORY IS IN EFFECT FROM 11 PM TODAY UNTIL 11 AM MONDAY FOR THE NORTH OREGON CASCADES, THE CASCADES ON MARION AND LINN COUNTIES, AND THE CASCADES OF LANE COUNTY.
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM 11 PM TODAY UNTIL 11 AM MONDAY ABOVE 4,000 FT. THE EAST SLOPES OF THE OREGON CASCADES.FOR
- A FLOOD WARNING IS IN EFFECT UNTIL WEDNESDAY MORNING FOR THE OWYHEE RIVER BELOW THE OWYHEE DAM AFFECTING 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 good (50%) chance of AM showers, partly cloudy and a bit warmer with a good (50%) chance of showers this afternoon (under 0.10 in. of rain possible), showers tonight (0.10 in. of rain possible),
- Mostly cloudy and a bit cooler with showers Monday (0.10 in. of rain possible), a good (50%) chance of evening showers, showers likely (70%) late Monday night (under 0.10 in. of rain possible),
- Mostly cloudy with showers likely (70%) and a slight (20%) chance of thunderstorms Tuesday, then partly cloudy with a slight (20%) chance of showers Tuesday night.
- highs 58-56 lows 43-38.
- Mostly sunny and a bit warmer Wednesday, partly cloudy with a (40%) chance of evening showers, a (40%) chance of showers late Wednesday night,
- A mix of clouds and sun and a bit warmer with a (40%) chance of showers Thursday, partly cloudy with a slight (20%) chance of showers at night,
- Mostly sunny and a bit warmer Friday, partly cloudy with a slight (20%) chance of showers Friday night,
- Then a mix of clouds and sun and as bit cooler with a (40%) chance of showers Saturday.
- highs 63-68 cooling to 65 Saturday lows 40-44 (seasonal averages high 64 low 42)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: HIGH (87)
WEEDS: ABSENT (0)
Measured 4.27.24
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 and a bit warmer with a (30%) chance of showers today snow level 3,500 ft), a (30%) of showers tonight (under 0.10 in. of rain possible, snow level 3,500 ft. falling to 3,300 ft. late tonight),
- Mostly cloudy with AM showers, a good (50%) chance of showers and a bit cooler Monday afternoon (under o.10 in. of rain possible, snow level 3,000 ft.), a (30%) of evening showers, a (30%) chance of rain and snow showers late at night (snow level 3,000 ft. falling to 2,500 ft. late at night),
- Mostly cloudy with a (30%) chance of AM rain and snow showers, a bit warmer with a (40%) chance of showers Tuesday afternoon, then partly cloudy with areas of frost late Tuesday night.
- highs 62-57 warming to 59 Saturday lows 44-39 warming to 42 Tuesday night.
- Some AM clouds with patchy frost, sunny and a bit warmer Wednesday afternoon, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers Wednesday night,
- Mostly cloudy and a bit warmer with a (30%) chance of showers Thursday, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late at night,
- Some AM clouds, sunny and a bit warmer Friday afternoon, partly cloudy with a slight (20%) chance of rain late Friday night,
- Then mostly cloudy and a bit cooler with a slight (20%) chance of rain Saturday.
- highs 66-72 cooling to 68 Saturday lows 40-44. (seasonal average high 67 low 44)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with a (40%) chance of showers today (under 0.10 in. of rain possible), a slight (20%) chance of evening coastal showers and coastal showers likely (70%) late tonight while a good (50%) chance of inland showers tonight (0.10 in. of rain possible),
- Mostly cloudy with AM showers likely (70%), a bit warmer with a good (50%) chance of showers Monday afternoon (under 0.10 in. of rain possible), partly cloudy with a (40%) of evening showers, mostly cloudy with a (40%) chance of showers late at night (under 0.10 in. of rain possible),
- Mostly sunny and a bit warmer with a good (50%) chance of showers Tuesday, then just partly cloudy Tuesday night.
- highs near 56 lows 43-40.
- Some AM clouds, sunny and a bit cooler Wednesday afternoon, partly cloudy with a (30%) chance of showers Wednesday night,
- Partly cloudy and a bit cooler with a (30%) chance of showers Thursday, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late at night,
- Partly cloudy and a bit warmer Friday, partly cloudy with a slight (20%) chance of evening rain, mostly cloudy with a slight (20%) chance of rain late Friday night,
- Then mostly cloudy and a bit cooler with a (30%) chance of rain Saturday.
- highs 60-62 cooling back 60 Saturday lows 42-44. (seasonal average high 58 low 46)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy and a bit warmer with a good (50%) chance of rain and snow showers today (0.10 in. of rain possible, little or no snow accumulation expected), rain and snow showers tonight (0.50 in. of rain possible, 1 in. of snow possible),
- Mostly cloudy and a bit cooler with snow and rain showers Monday (AM snow possibly heavy at times), rain and snow showers Monday night,
- Mostly cloudy and a bit warmer with snow and rain showers likely (70%) Tuesday, then a good (50%) chance of rain and snow showers with a slight (20%) chance of thunderstorms Tuesday night.
- snow level 4,500 ft. today, 3,500 ft. tonight, 3,000 ft. Monday, 2,500 ft. Monday night, 3,000 ft. Tuesday, then 3,500 ft. Tuesday night,
- highs 46-37 warming to 48 Tuesday lows 28-24.
- Mostly sunny and a bit warmer with a slight (20%) chance of rain and snow showers Wednesday, mostly cloudy with a (40%) chance of evening rain showers and a slight (20%) chance of snow showers, mostly cloudy with a (40%) chance of rain and snow showers late Wednesday night,
- A mix of clouds and sun with a (40%) chance of rain and snow showers and a bit warmer Thursday, mostly cloudy with a (40%) chance of evening rain and snow showers, partly cloudy with a (40%) chance of rain showers and a slight (20%) chance of snow showers late at night,
- Mostly sunny and a bit warmer with a (30%) chance of snow showers and a slight (20%) chance of rain showers Friday, partly cloudy with a slight (20%) chance of showers Friday night,
- Then a mix of clouds and sun and a bit cooler with a good (50%) chance of rain and snow showers Saturday.
- snow level 4000 ft. Wednesday, 5,000 ft. Wednesday night, 5,500 ft. Thursday, 6,000 ft. Thursday night and Friday, 6,500 Friday night, then 6,000 ft. Saturday.
- highs 48-56 cooling to 52 Saturday lows 29-34.
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