May
04.
Here is my weekly weather quiz question for the last time. “What is a “Red Flag Warning?” Here is the correct answer A Red Flag Warning is a term used by fire-weather forecasters to call attention to limited weather conditions of particular importance that may result in extreme burning conditions. It is issued when it is an on-going event or the fire weather forecaster has a high degree of confidence that Red Flag criteria will occur within 24 hours of issuance. Red Flag criteria occurs whenever a geographical area has been in a dry spell for a week or two, or for a shorter period , if before spring green-up or after fall color, and the National Fire Danger Rating System (NFDRS) is high to extreme and the following forecast weather parameters are forecasted to be met:
1) a sustained wind average 15 mph or greater
2) relative humidity less than or equal to 25 percent and
3) a temperature of greater than 75 degrees F.
In some states, dry lightning and unstable air are criteria. A Fire Weather Watch may be issued prior to the Red Flag Warning.
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An Upper Level Low Pressure Trough (“U” shape) is over the Pacific Northwest. The graphics for days 1-3 show a frontal system sliding through Pacific Northwest between Sunday night and Monday. The graphics for days 3-7 Tuesday through Saturday show no frontal systems moving across the Pacific Northwest through the period, but one well to our Northwest next Saturday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 36 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 5 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 36 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 UNTIL 6 PM SUNDAY ABOVE 4,000 FT FOR THE NORTHERN OREGON CASCADES, THE CASCADES OF MARION AND LINN COUNTIES, AND THE CASCADES OF LANE COUNTY.
- A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 11 AM SUNDAY ABOVE 4,000 FT. FOR THE EAST SLOPES OF THE OREGON CASCADES.
- A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 11 PM SUNDAY ABOVE 4,000 FT. THE OCHOCO AND THE JOHN DAY HIGHLANDS.
- A WIND ADVISORY IS IN EFFECT FROM 2 AM UNTIL 11 PM SUNDAY FOR THE EASTERN COLUMBIA GORGE OF OREGON, THE LOWER COLUMBIA BASIN OF OREGON, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, AND NORTH CENTRAL OREGON.
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 tonight (0.25 in. of rain possible),
- Mostly cloudy rain and a bit warmer Sunday (0.25 in. of rain possible), rain Sunday night (0.10 in. of rain possible),
- Mostly cloudy with AM rain and a slight (20%) chance of thunderstorms, a bit warmer with showers and a slight (20%) chance of thunderstorms Monday afternoon ( 0.25 in. of rain possible), rain at night (under 0.10 in. of rain possible),
- A mix of clouds and sun with a good (50%) chance of rain and a bit warmer Tuesday, partly cloudy in the evening, then mostly clear late Tuesday night.
- lows 43-45 cooling to 38 Tuesday night highs 54-59.
- Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Sunny and warmer Thursday, clear at night,
- Sunny and a bit warmer Friday, clear Friday night,
- Sunny and a bit warmer Saturday.
- highs 63-82 lows 40-50 (seasonal averages high 66 low 43)
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EUGENE-SPRINGFIELD POLLEN COUNT:
GRASS: ABSENT (0)
TREES: LOW (11)
WEEDS: ABSENT (0)
Measured 5.4.24
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 early evening showers likely (70%) and a slight (20%) chance of thunderstorms, a good (50%) chance of late evening rain and snow continuing tonight (under 0.10 in. of rain possible, snow level 3,000 ft. falling to 2,500 ft. late tonight, no snow accumulation expected),
- Mostly cloudy with AM rain and snow, a good (50%) of rain and a bit warmer Sunday afternoon (under 0.10 in. of rain possible, snow level 2,500 ft. rising to 3,500 ft.), a (40%) chance of evening showers, a (30%) chance of rain and snow Sunday night (under 0.10 in. of rain possible, snow level 3,500 ft.),
- Mostly cloudy with AM rain, showers with a slight (20%) chance of thunderstorms Monday afternoon (0.25 in. of rain possible, snow level 3,500 ft.), evening showers with a slight (20%) chance of thunderstorms, a good (50%) chance of rain and snow late Monday night (under 0.10 in. of rain possible, snow level 3,500 ft. falling to 3,000 ft.),
- Mostly cloudy with a (40%) chance of AM and snow, a bit warmer with a (30%) chance of rain Tuesday afternoon, partly cloudy in the evening, then mostly clear late Tuesday night.
- lows 42-44 cooling to 39 Tuesday night highs 55-59.
- Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Sunny and warmer Thursday, clear at night,
- Sunny and a bit warmer Friday, mostly clear Friday night,
- Then mostly sunny and a bit warmer Saturday.
- highs 65-84 lows 42-52. (seasonal average high 69 low 46)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with a good (50%) chance of early evening showers and a slight (20%) chance of thunderstorms, a (30%) chance of late evening rain continuing overnight tonight (under 0.10 in. of rain possible),
- Mostly cloudy with AM rain, a good (50%) chance of rain and a bit warmer Sunday afternoon (0.10 in. of rain possible), cloudy with rain and snow likely (70%) Sunday night (under 0.10 in. of rain possible),
- Mostly cloudy with AM rain, mostly cloudy coastal showers likely (70%) with a slight (20%) chance of rain thunderstorms Monday afternoon while inland showers with a slight (20%) chance of thunderstorms Monday afternoon (0.25 in. of rain possible), mostly cloudy with a good (50%) chance of evening coastal showers and a slight (20%) chance of thunderstorms while evening inland showers and a slight (20%) chance of thunderstorms, rain late at night (0.10 in. of rain possible),
- Mostly cloudy with a good (50%) chance of AM rain, partly cloudy and a bit warmer with a slight (20%) chance of rain Tuesday afternoon, then becoming mostly clear Tuesday night.
- lows 43-45 cooling to 40 Tuesday night highs 55-57.
- Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Sunny and as bit warmer Thursday, clear at night,
- Sunny and warmer Friday, mostly clear Friday night,
- Then mostly sunny and a bit cooler Saturday.
- highs 60-74 cooling to 72 Saturday lows 43-52. (seasonal average high 59 low 47)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly cloudy with snow and rain tonight (0.75 in. of rain possible, 4-8 in. of snow possible, snow possibly heavy at times),
- Mostly cloudy and a bit warmer with rain and snow Sunday (0.75 in. of rain possible, 3-6 in. of snow possible), rain and snow Sunday night (0.25 in. of rain possible, 2 in. of snow possible),
- Mostly cloudy with AM rain and snow, showers, snow showers and a slight (20%) thunderstorms and a bit warmer Monday afternoon and evening, snow and rain late at night,
- Mostly cloudy and a bit cooler with snow with rain likely (70%) Tuesday, then a (50%) chance of rain Tuesday night.
- snow level 3,000 ft. tonight, 3,000 ft. rising to 4,000 ft. Sunday afternoon, 4,000 ft. Sunday night and Monday, 3,000 ft. Monday night, then 3,500 ft. Tuesday and Tuesday night.
- lows 27-30 cooling back to 25 Tuesday night highs 36-38.
- Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
- Sunny and warmer Thursday, mostly clear at night,
- Sunny and a bit warmer Friday and Saturday mostly clear Friday night,
- free air freezing level 5,500 ft. Wednesday, 8,000 ft. Wednesday night, 8,000 ft. Thursday, 10,000 ft. Thursday night, 11,000 ft. Friday, 12,000 ft. Friday night, then 11,000 ft. Saturday.
- highs 45-67 lows 28-42.
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