Here is my weekly weather quiz question for the last time. What is the “Lifted Index? Here is the correct answer.  Lifted Index(abbrev. LI)- A common measure of atmospheric instability. Its value is obtained by computing the temperature that air near the ground would have if it were lifted to some higher level (around 18,000 feet, usually) and comparing that temperature to the actual temperature at that level. Negative values indicate instability – the more negative, the more unstable the air is, and the stronger the updrafts are likely to be with any developing thunderstorms. However there are no “magic numbers” or threshold LI values below which severe weather becomes imminent.

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An Upper Level Low  and surface low with it associated cold front are sliding down the California coast keeping the flow of coastal moisture aimed our way. The graphics for days 1-3  show the frontal system, as described above,  moving southward tonight. The graphics for days 3-7  Tuesday through next Saturday show a quiet weather pattern, but a parade of fronts can be seen offshore to our northwest.

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Air Quality Index:

Eugene/Springfield: The Air Quality Index is 19 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 11 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 21 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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ADVISORIES:

• A FLOOD WARNING IS IN EFFECT UNTIL NEXT WEDNESDAY MORNING FOR THE JOHN DAY RIVER AT SERVICE CREEK AFFECTING WHEELER COUNTY.
• A FLOOD WARNING IS IN EFFECT FOR THE SPRAGUE  RIVER NEAR BEATTY AFFECTING KLAMATH COUNTY UNTIL EARLY SUNDAY MORNING DUE TO SNOW MELT.
• A FLOOD WARNING IS IN EFFECT FOR THE SILVIES RIVER NEAR BURNS AFFECTING HARNEY  COUNTY UNTIL LATE NEXT MONDAY NIGHT DUE TO SNOW MELT.
• A FLOOD ADVISORY IS IN EFFECT FOR BAKER COUNTY DUE TO RAIN AND SNOW MELT UNTIL 5 PM MDT SUNDAY.

HEALTH ADVISORIES:

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly cloudy with patchy AM fog, a good (50%) chance of showers today (under 0.10 in. of rain possible), a slight (20%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM showers, a good (50%) chance of showers Sunday afternoon, a good (50%) chance of evening showers, a good (50%) chance of rain late at night (under 0.10 in. of rain possible),
• Mostly cloudy with AM rain likely (70%), showers likely (70%) with a slight (20%) chance of thunderstorms Monday afternoon, a (40%) chance of evening showers, then partly cloudy late Monday night.
• highs near 60 lows 42-44 cooling back to 42 Monday night.
• AM clouds and sun with a slight (20%) chance of showers and a bit warmer Tuesday, partly cloudy Tuesday night,
• Partly cloudy and a bit warmer Wednesday, partly cloudy at night,
• Partly cloudy and a bit warmer Thursday, mostly clear Thursday night,
• Then mostly sunny and a bit warmer Friday.
• highs 65-76 lows 42-46. (seasonal averages high 66 low 43)

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Home Wood Heating Advisory:

Posted Daily

Eugene-Springfield: GREEN– Burning is Allowed.

Oakridge: GREEN– Burning is Allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Data courtesy of Lane Regional Air Protection Agency (LRAPA

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Eugene-Springfield Pollen Count:

Forecast for the Umpqua Valley including Roseburg:

• Mostly cloudy with a good (50%) chance of AM showers, showers likely (70%) this afternoon (under 0.10 in. of rain possible), a (30%) chance of showers tonight (0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers and a bit warmer Sunday, evening showers likely (70%), rain late at night (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM showers, a bit cooler with showers likely (70%) Monday afternoon, then a (30%) chance of showers Monday night.
• highs 62-63 c0oling to 60 Monday lows 42-47 cooling to 46 Monday night.
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy a bit warmer with a slight (20%) chance of showers Tuesday afternoon, partly cloudy Tuesday night,
• Partly cloudy and a bit warmer Wednesday, partly cloudy at night,
• Mostly sunny and a bit warmer Thursday, mostly clear Thursday night,
• Then sunny and a bit warmer Friday.
• highs 66-80 lows 45-49. (seasonal averages high 69 low 46)

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy and a bit warmer with a (30%) chance of showers today (under 0.10 in. of rain possible), a slight (20%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers Sunday, evening showers, rain late at night (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) of AM rain, a good (50%) chance of showers and a bit warmer Monday afternoon, then a slight (20%) chance of showers Monday night.
• highs near 58 lows 42-45 cooling back to 42 Monday night.
• Mostly cloudy with a slight (20%) chance of AM showers, just partly cloudy and a bit warmer Tuesday, partly cloudy Tuesday night,
• Partly cloudy and a bit warmer Wednesday and at night,
• Mostly sunny and a bit warmer Thursday, mostly clear Thursday night,
• Then sunny and a bit warmer Friday.
• highs 60-67 lows 43-45. (seasonal averages high 59 low 47)

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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:

• Mostly cloudy with a good (50%) chance of AM rain and snow showers, showers with a slight (20%) chance of thunderstorms and a bit warmer this afternoon (0.25 in. of rain possible, 1 in. of snow possible), evening showers and snow showers likely (70%) with a slight (20%) chance of evening thunderstorms, a good (50%) chance of rain and snow showers late tonight (0.25 in. of rain possible, 1 in. of snow possible),
• Mostly cloudy with a good (50%) chance of AM snow showers, a good (50%) chance of showers and a bit warmer Sunday afternoon (little or no snow accumulation expected), evening showers likely (70%), rain and snow likely (70%) late at night,
• Mostly cloudy AM rain and snow likely (70%), showers and a bit cooler with a slight (20%) chance of thunderstorms Monday afternoon, evening rain and snow showers likely (70%), then a slight (20%) chance of rain and snow showers  late Monday night.
• snow level 5,000 ft. today, 4,500 ft. tonight, 4,000 ft. rising to 5,000 ft. Sunday afternoon, then 5,000 ft. Sunday night through Monday night.
• highs 42-44 cooling to 42 Monday lows 28-32 cooling to 29 Monday night.
• Clouds and sun with slight (20%) chance of AM rain and snow showers, a good (50%) chance of showers and a bit warmer Tuesday afternoon, partly cloudy with a (30%) chance of evening showers, just partly cloudy late Tuesday night,
• Partly cloudy and a bit warmer with a slight (20%) chance of showers Wednesday afternoon and evening, just partly cloudy late at night,
• Some AM clouds, sunny and a bit warmer Thursday afternoon, mostly clear Thursday night,
• Then mostly sunny and a bit warmer Friday.
• snow level 5,000 ft. Tuesday, 5,500 ft. Tuesday night, 6,000 ft. Wednesday, 6,500 ft Wednesday night,free air freezing level 9,000 ft. Thursday, 11,000 ft. Thursday night, then 13,000 ft. Friday.
• highs 47-65 lows 32-36.

5.3.23