Mar
09.
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 today then moving in by Sunday. The graphics for days 3-7 Wednesday through Sunday show increasing frontal activity through the period.
NOTE: Daylight Saving Time officially begins at 2 AM this today March 10th. If you forgot to “SPRING AHEAD” at bedtime last night by setting your clocks ahead by one hour do it now. 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 15 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 35 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 5 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 THROUGH TONIGHT ABOVE 4,500 FT. FOR THE CASCADES OF MARION AND LINN COUNTIES.
- A WINTER WEATHER ADVISORY IS IN EFFECT THROUGH TONIGHT ABOVE 4,000 FT. FOR THE NORTH OREGON CASCADES.
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM 5 AM UNTIL 5 PM TODAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.
- A HIGH WIND WARNING IS IN EFFECT UNTIL 8 AM TODAY 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 FROM 11 AM UNTIL 8 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 WATCH IS IN EFFECT INTO THIS MORNING NEAR BEACHES AND HEADLANDS FOR THE CLATSOP COUNTY COAST, THE TILLAMOOK COUNTY COAST, AND THE CENTRAL COAST OF OREGON.
- A HIGH WIND WATCH IS IN EFFECT INTO THIS MORNING FOR AREA ABOVE 1,000 FT. FOR THE NORTH OREGON COAST RANGE AND THE CENTRAL OREGON COAST RANGE.
- A FLOOD WATCH IS IN EFFECT THROUGH EARLY WEDNESDAY 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, showers likely (70%) and slightly cooler with a slight (20%) chance of thunderstorms this afternoon and evening (0.50 in. of rain possible, more in storms), a good (50%) chance of showers late tonight (0.10 in. of rain possible, more in storms),
- Mostly cloudy with AM showers, rain Monday afternoon (0.10 in. of rain possible), rain at night (0.25 in. of rain possible),
- Mostly cloudy with showers Tuesday, then a good (50%) chance of showers Tuesday night.
- highs near 52 lows 40-43 cooling to 38 Tuesday night.
- A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Wednesday, just partly cloudy Wednesday night,
- Some AM clouds, sunny and a bit warmer Thursday, partly cloudy at night,
- Some AM clouds, sunny and warmer Friday afternoon, partly cloudy Friday night,
- Some AM clouds, then mostly sunny and a bit cooler Saturday afternoon.
- highs 53-70 cooling to 66 Saturday lows 34-40. (seasonal averages high 56 low 37)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: LOW (6)
WEEDS: ABSENT (0)
Measured 3.9.24
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 showers and snow showers with a slight (20%) chance of thunderstorms (snow possibly heavy at times), a good (50%) chance of showers and a slight (20%) chance of thunderstorms and a bit cooler this afternoon (0.50 in. of rain possible, snow level 3,000 ft. rising to 3,500 ft. this afternoon), evening showers, a good (50%) chance of showers late tonight (under 0.10 in. of rain possible, snow level 3,000 ft.),
- Cloudy with AM rain and snow, rain Monday afternoon (3,000 ft. rising to 3,500 ft.), rain Monday night (snow level 3,500 ft. late at night) and breezy (Wind: S 15-25 mph),
- Mostly cloudy with rain Tuesday, a (40%) chance of rain and snow Tuesday night.
- highs near 52 lows 40-43 cooling to 39 Tuesday night.
- Mostly cloudy with a slight (20%) chance of AM rain, just partly cloudy and a bit warmer Wednesday afternoon, mostly clear Wednesday night,
- Mostly sunny and a bit warmer Thursday and Friday, mostly clear Thursday night,
- Then mostly sunny and slightly warmer Saturday.
- highs 54-70 lows 36-42. (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 AM coastal showers and a slight (20%) chance of thunderstorms and a good (50%) chance of coastal showers and a slight (20%) chance of thunderstorms this afternoon (1.00 in. of rain possible) while inland AM showers likely (70%) with a slight (20%) chance of thunderstorms and inland showers and a slight (20%) chance of thunderstorms this afternoon (0.50 in. of rain possible), a good (50%) chance of evening coastal showers with a slight (20%) chance of thunderstorms at rain likely (70%) tonight while inland evening showers and a slight (20%) chance of thunderstorms and inland showers likely (70%) late tonight (0.10 in. of rain possible),
- Mostly cloudy and a bit cooler with rain and windy (Wind: S 20-30 mph gusts to 45 mph) Monday (0.10 in. of rain possible), coastal showers with a slight (20%) chance of thunderstorms at night while rain (0.50 in. of rain possible) and windy Monday night (Wind: S 20-30 mph gusts to 45 mph decreasing and shifting SW 10-20 mph late at night),
- Mostly cloudy with AM rain, a good (50%) chance of rain and a bit warmer Tuesday afternoon, then a slight (20%) chance of rain Tuesday night.
- highs 54-52 warming back to 54 Tuesday lows 42-39.
- Mostly cloudy with a slight (20%) chance of AM rain, just partly cloudy and a bit warmer Wednesday afternoon, mostly clear in the evening, partly cloudy late Wednesday night,
- Sunny and warmer Thursday, partly cloudy at night,
- Then mostly sunny and a bit warmer Friday, mostly clear Friday night,
- Then mostly sunny and a bit cooler Saturday.
- highs 56-69 cooling to 66 Saturday lows 38-45. (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 rain and snow showers (snow possibly heavy at times), a bit cooler with a good (50%) chance of rain and snow showers this afternoon (2-5 in. of snow possible) and windy (Pass Wind: SW 20-30 mph, AM gusts to 50 mph), evening snow and rain showers likely (70%), a good (50%) chance of snow and rain showers late tonight (0.25 in. of rain possible, 2 in. of snow possible),
- Mostly cloudy with AM snow and rain showers, rain and snow Monday afternoon (snow possibly heavy at times), rain and snow showers Monday night (snow possibly heavy at times), snow and rain at night,
- Mostly cloudy with snow and rain showers Tuesday, then a good (50%) chance of snow and rain showers likely (70%) Tuesday night.
- snow level 3,500 ft. today, 3,000 ft. tonight and Monday, 4,000 ft. Monday night, 3,500 ft. Tuesday, then 2,500 ft. Tuesday night.
- highs near 35 lows 26-30 cooling to 24 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 rain showers Wednesday, just partly cloudy Wednesday night,
- Mostly sunny and warmer Thursday, mostly clear Thursday night,
- Then mostly sunny and a bit warmer Friday and Saturday, mostly clear Friday night,
- snow level 2,500 ft. Wednesday, free air freezing level 5,000 ft. Wednesday night, 10,000 ft. Thursday and Thursday night, then 12,000 ft. Friday through Saturday.
- highs 37-53 lows 24-32.
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