Mar
08.
Here is my weekly weather quiz question for the last time. “What is a “Pseudo-Cold Front?” Here is the correct answer. A Pseudo-Cold Front is a boundary between a supercell’s inflow region and the rear-flank downdraft (or RFD). It extends outward from the mesocyclone center, usually toward the south or southwest (but occasionally bows outward to the east or southeast in the case of an occluded mesocyclone), and is characterized by advancing of the downdraft air toward the inflow region. It is a particular form of gust front.
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An Upper Level High Pressure Ridge (“Arch” shape) is keeping the Pacific Northwest dry. The graphics for days 1-3 show a frontal system approaching the coast Saturday then moving in by Sunday. The graphics for days 3-7 Tuesday through Saturday show increasing frontal activity through the period.
NOTE: Daylight Saving Time officially begins at 2 AM this Sunday March 10th. Don’t forget to “SPRING AHEAD” at bedtime tonight by setting your clocks ahead by one hour. The authorities recommend that everyone check home Smoke Detectors, CO Detectors, and RADON Detectors to make sure they are in working order. Depending on the type you have and how old they are you can replace bad batteries or replace the whole Detector.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 55 in the Moderate category measuring Particulate Matter.
Oakridge: The Air Quality Index is 45 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 70 in the Moderate 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 4 AM TODAY UNTIL 5 AM MONDAY ABOVE 4,500 FT. FOR THE CASCADES OF MARION AND LINN COUNTIES.
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM UNTIL 4 PM TODAY FOR THE SOUTH CENTRAL OREGON CASCADES.
- A HIGH WIND WATCH IS IN EFFECT FROM THIS EVENING THROUGH SUNDAY MORNING FOR THE HEADLANDS AND EXPOSED AREAS ON HIGHWAY 101 FOR THE SOUTH CENTRAL OREGON COAST AND AND THE CURRY COUNTY COAST.
- A WIND ADVISORY IS IN EFFECT UNTIL 3 PM TODAY FOR THE GRANDE RONDE VALLEY.
- A WIND ADVISORY IS IN EFFECT FROM 7 AM UNTIL 7 PM TODAY FOR NORTHERN AND EASTERN KLAMATH COUNTY AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY, INCLUDING THE HIGH TERRAIN IN KLAMATH AND LAKE COUNTIES
- A HIGH WIND WARNING IS IN EFFECT UNTIL 10 AM TODAY FOR THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON.
- A FLOOD WATCH IS IN EFFECT THROUGH NEXT THURSDAY AFTERNOON FOR THE COQUILLE RIVER AT COQUILLE AFFECTING THE SOUTH CENTRAL OREGON COAST.
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 AM showers, a good (50%) chance of showers and cooler this afternoon (0.25 in. of rain possible), a good (50%) chance of evening showers, showers late tonight (0.25 in. of rain possible) and breezy (Wind: S 10-15 mph increasing to S 20-25 mph late tonight),
- Mostly cloudy and a bit cooler with showers Sunday (0.25 in. of rain possible) and in the evening, rain late at night (0.10 in. of rain possible),
- Mostly cloudy with rain and a bit warmer Monday, then rain Monday night.
- highs 52-50 warming back to 52 Monday lows near 42.
- Mostly cloudy with showers and a slight (20%) chance of thunderstorms Tuesday, showers likely (70%) Tuesday night,
- Mostly cloudy and a bit warmer with a (40%) chance of showers Wednesday, just partly cloudy at night,
- Then partly cloudy and a bit warmer Thursday and Friday, partly cloudy Thursday night,
- highs 52-65 lows 39-35 warming to 37 Thursday night. (seasonal averages high 56 low 37)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: MODERATE (31)
WEEDS: ABSENT (0)
Measured 3.8.24
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 AM rain likely (70%), cooler with a good (50%) chance of showers this afternoon (0.10 in. of rain possible, snow level 3,000 ft. falling to 2,500 ft. this afternoon), mostly cloudy with a good (50%) chance of evening rain and snow showers, rain and snow late tonight (under 0.10 in. of rain possible, snow possibly heavy at times),
- Mostly cloudy with AM rain and snow with a slight (20%) chance of thunderstorms, rain with a slight (20%) chance of thunderstorms Sunday afternoon (0.50 in. of rain possible), evening rain, rain and snow late at night (under 0.10 in. of rain possible),
- Mostly cloudy with AM rain and snow, rain Monday afternoon, then rain Monday night.
- highs near 52 lows near 42.
- Mostly cloudy with rain Tuesday, a good (50%) chance of evening rain, a good (50%) chance of rain and snow late Tuesday night,
- Mostly cloudy with a slight (20%) chance of AM rain, just mostly cloudy and a bit warmer Wednesday afternoon, just partly cloudy at night,
- Then mostly sunny and a bit warmer Thursday and Friday, mostly clear Thursday night,
- highs 52-68 lows 42-37 warming to 39 Thursday night. (seasonal average high 58 low 39)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with a (30%) chance of AM rain, slightly cooler with a good (50%) chance of showers this afternoon (0.25 in. of rain possible) and breezy (Coastal Wind: SW 15-25 mph while Inland Wind: SW 15-25 mph decreasing to SW 10-15 mph this afternoon), cloudy with evening coastal showers while a good (50%) chance of inland evening showers, rain late tonight (0.25 in. of rain possible) and breezy (Coastal Wind: S 10-20 mph increasing to S 20-30 mph gusts to 40 mph) while (Inland Wind: S 20-30 mph),
- Mostly cloudy with showers and a slight (20%) chance of thunderstorms Sunday (1.00 in. of rain possible), coastal rain with a slight (20%) chance of thunderstorms at night while inland rain at night (0.25 in. of rain possible),
- Mostly cloudy with rain and breezy Monday, then rain and breezy Monday night.
- highs near 53 lows 42-44.
- Mostly cloudy with AM rain, rain likely (70%) and a bit warmer Tuesday afternoon, a (30%) chance of rain Tuesday night,
- Mostly cloudy with a slight (20%) chance of AM rain, just partly cloudy and a bit warmer Wednesday afternoon and evening, mostly clear at night,
- Then sunny and warmer Thursday and Friday, partly cloudy Thursday night,
- highs 54-69 lows 42-39 warming to 43 Thursday night. (seasonal average high 55 low 42)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy with AM snow and rain showers, a good (50%) chance of snow and rain showers and cooler this afternoon (0.25 in. of rain possible, 1-4 in. of snow possible), a good (50%) chance of snow and rain showers tonight (0.10 in. of rain possible, 1 in. of snow possible) and windy (Pass Wind: S 15-20 mph gusts to 40 mph increasing S 25-35 mph gusts to 50 mph late tonight)
- Mostly cloudy and a bit cooler with rain showers and snow showers Sunday (afternoon snow possibly heavy at times), evening snow and rain showers, snow and rain late at night,
- Mostly cloudy with snow and rain Monday, then rain and snow showers Monday night (snow possibly heavy at times).
- snow level 4,500 ft. tonight, 3,000 ft. Saturday and Saturday night, 3,500 ft. Sunday, 3,000 ft. Sunday night, 3,500 ft. Monday, then 4,500 ft. Monday night.
- highs near 35 lows 26-30.
- Mostly cloudy with rain and snow showers (snow possibly heavy at times) Tuesday, snow showers likely (70%) with rain showers Tuesday night,
- A mix of clouds and sun and a bit warmer with a good (50%) chance of snow showers and a slight (20%) chance of showers Wednesday, just partly cloudy at night,
- Mostly sunny start, partly cloudy and a bit warmer Thursday afternoon and Friday afternoon, partly cloudy Thursday night.
- snow level 3,500 ft. Tuesday, 3,000 ft. Tuesday night and Wednesday, free air freezing level 4,500 ft. Wednesday night, 8,000 ft. Thursday and Thursday night, then 11,000 ft. Friday.
- highs 34-48 lows 25-30.
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