Apr
26.
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 Saturday today. The graphics for days 3-7 Tuesday through Saturday show the frontal system moving across the Pacific Northwest Tuesday, then another front offshore that pushes in between Thursday and Friday.
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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 7 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 THURSDAY 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 rain likely (70%) and a bit warmer today (under 0.10 in. of rain possible), evening showers likely (70%), a good (50%) chance of showers late tonight (under 0.10 in. of rain possible),
- Mostly cloudy with showers likely (70%) and a bit warmer Sunday (under 0.10 in. of rain possible), a good (50%) chance of evening showers, showers likely (70%) late at night (under 0.10 in. of rain possible),
- Mostly cloudy and a bit cooler with showers likely (70%) Monday, then a good (50%) chance of showers Monday night.
- highs 57-60 cooling back to 57 Monday lows 43-47 cooling to 42 Sunday night.
- A mix of clouds and sun and a bit warmer with a good (50%) chance of showers and a slight (20%) chance of thunderstorms Tuesday, just partly cloudy Tuesday night,
- A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Wednesday, mostly cloudy with a (40%) chance of showers at night,
- A mix of clouds and sun with a good (50%) chance of showers Thursday, mostly cloudy with a good (50%) chance of showers Thursday night,
- Then a mix of clouds and sun with a (40%) chance of showers Friday.
- highs 59-65 lows 39-44 (seasonal averages high 64 low 41)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: HIGH (123)
WEEDS: LOW (3)
Measured 4.26.24
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%) of rain this afternoon, a slight (20%) chance of rain tonight (under 0.10 in. of rain possible),
- Mostly cloudy with a (30%) chance of showers Sunday, a good (50%) of showers at night (snow level 4,400 ft. falling to 3,300 ft. late at night),
- Mostly cloudy and a bit warmer with a good (50%) chance of showers Monday afternoon (snow level 3,000 ft.), then just mostly cloudy with a slight (20%) of showers Monday night (snow level 3,100 ft).
- highs 54-56 lows 44-47 cooling to 42 Sunday night.
- Mostly cloudy with a (30%) chance of showers and a bit warmer Tuesday (snow level 2,800 ft. rising to 4,100 ft.), just partly cloudy Tuesday night,
- Mostly sunny and a bit cooler with a slight (20%) chance of showers Wednesday, a (40%) chance of showers at night,
- A mix of clouds and sun and a bit cooler with a good (50%) chance of showers Thursday, mostly cloudy with a (40%) chance of showers Thursday night,
- Then a mix of clouds and sun with a (30%) chance of showers Friday.
- highs 56-62 lows 40-44. (seasonal average high 66 low 44)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with rain likely (70%) this afternoon, cloudy with a good (50%) chance of rain tonight,
- Mostly cloudy with a good (50%) chance of AM rain, a slight (20%) chance of rain Sunday afternoon, showers likely (70%) Sunday night (snow level 3,300 ft.),
- Clouds and sun with AM showers showers likely (70%), a mix of clouds and sun and a bit warmer Monday afternoon, then partly cloudy with a (30%) of showers late Monday night (snow level 3,300 ft.).
- highs near 56 lows 44-47 cooling to 42 Sunday night .
- AM sun with a slight (20%) chance of showers, mostly sunny and a bit warmer Tuesday afternoon, just partly cloudy Tuesday night,
- A mix of clouds and sun and a bit cooler with a (40%) chance of showers Wednesday afternoon, mostly cloudy with a slight (20%) chance of showers at night,
- A mix of clouds and sun and a bit cooler with a good (50%) chance of showers Thursday, mostly cloudy with a (40%) chance of showers Thursday night,
- Then a mix of clouds and sun with a slight (20%) chance of showers Friday.
- 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 with a slight (20%) chance of AM rain and snow, rain showers with snow showers likely (70%) and a bit warmer this afternoon, rain and snow showers tonight,
- Mostly cloudy and a bit warmer with rain and snow showers likely (70%) Sunday, rain and snow showers at night,
- Mostly cloudy and a bit cooler with snow showers and rain showers Monday, mostly cloudy with good (50%) chance of snow and rain showers Monday afternoon, then mostly cloudy with a good (50%) chance of snow and rain showers late Monday night.
- snow level 4,500 ft. today, 4,500 ft. tonight, 4,500 ft. Sunday, 4,500 ft. falling top 3,500 ft. late Sunday night, then 3,000 ft. Monday and Monday night.
- highs 42-46 cooling 39 Monday lows 33-25.
- A mix of clouds and sun and warmer with snow showers and rain showers likely (70%) and a slight (20%) chance of thunderstorms Tuesday, partly cloudy with a slight (20%) chance of thunderstorms and snow showers Tuesday night,
- Mostly sunny and a bit warmer with a slight (20%) chance of rain and snow showers Wednesday, a good (50%) chance of rain and snow showers at night,
- Mostly cloudy with rain and snow showers likely (70%) Thursday, a good (50%) chance of rain and snow showers Thursday night,
- Then a mix of clouds and sun with a good (50%) chance of rain and snow showers Friday.
- snow level 3,500 ft. Tuesday at the surface Tuesday night, 5.000 ft. Wednesday, then 5,500 ft. Wednesday night through Friday.
- highs 44-52 lows 27-33.
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