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 approaching the California coast keeping the weaker flow of coastal moisture still aimed our way. The graphics for days 1-3  show the frontal system, as described above ,apparently falling as part as it makes landfall. The graphics for days 3-7  Wednesday through next Sunday show a quiet weather pattern, but a frontal system can be seen offshore to our west Sunday.

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Air Quality Index:

Eugene/Springfield: The Air Quality Index is 34 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 35 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 LATE MONDAY EVENING FOR THE JOHN DAY RIVER AT SERVICE CREEK AFFECTING WHEELER COUNTY DUE TO RAIN AND SNOW MELT.
• A FLOOD ADVISORY IS IN EFFECT UNTIL TUESDAY AFTERNOON FOR THE SPRAGUE RIVER NEAR BEATY AFFECTING KLAMATH COUNTY DUE TO RAIN AND SNOW MELT.
• A FLOOD WARNING IS IN EFFECT FOR THE SILVIES RIVER NEAR BURNS AFFECTING HARNEY  COUNTY UNTIL   WEDNESDAY AFTERNOON DUE TO RAIN AND SNOW MELT.
• A FLOOD ADVISORY IS IN EFFECT FOR BAKER COUNTY UNTIL 6 PM MDT TUESDAY DUE TO RAIN AND SNOW MELT.

HEALTH ADVISORIES:

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

• Mostly cloudy with rain likely (70%) late tonight (0.25 in. of rain possible),
• Mostly cloudy with AM rain, showers and a bit cooler Monday afternoon (0.25 in. of rain possible), a slight (20%) chance of evening showers, partly cloudy late Monday night (under 0.10 in. of rain possible),
• Partly cloudy with patchy AM fog, partly cloudy and a bit warmer Tuesday afternoon, mostly clear at night,
• Mostly sunny and a bit warmer Wednesday, then partly cloudy Wednesday night.
• lows 46-42 warming back to 46 Wednesday highs 57-65.
• Partly cloudy and a bit warmer Thursday, partly cloudy Thursday night,
• Some AM clouds, mostly sunny and a bit warmer Friday afternoon, mostly clear at night,
• Mostly sunny and a bit warmer Saturday and Sunday, clear Saturday night.
• highs 74-88 lows 47-57. (seasonal averages high 67 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 evening showers likely (70%), showers late tonight (0.25 in. of rain possible),
• AM showers, a bit cooler with showers likely (70%) and a slight (20%) chance of thunderstorms Monday afternoon (0.10 in. of rain possible), a (30%) chance of evening showers and a slight (20%) chance of thunderstorms late Monday night (under 0.10 in. of rain possible),
• Partly cloudy and warmer Tuesday, mostly clear at night,
• Some AM clouds, sunny and a bit warmer Wednesday afternoon, then partly cloudy Wednesday night.
• lows 44-48 highs 56-72.
• Mostly sunny and a bit warmer Thursday, mostly clear Thursday night,
• Sunny and a bit warmer Friday and Saturday, clear both nights,
• AM sun, then partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Sunday afternoon.
• highs 77-89 cooling to 87 Sunday lows 50-57. (seasonal averages high 69 low 46)

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

• Mostly cloudy with evening coastal showers likely (70%) and showers late tonight while inland showers tonight (0.25 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), a good (50%) chance of showers Monday afternoon (0.10 in. of rain possible), partly cloudy Monday night with a slight (20%) chance of evening inland showers,
• Some AM clouds, sunny and warmer Tuesday afternoon, mostly clear at night,
• Some AM clouds, sunny Wednesday afternoon, partly cloudy in the evening, then mostly cloudy late Wednesday night.
• lows 47-42 warming to 44 Wednesday night highs 56-62.
• Mostly sunny and a bit warmer Thursday, mostly clear Thursday night,
• Sunny and a bit warmer Friday and Saturday, clear both nights,
• Sunny start, then partly cloudy and a bit warmer Sunday afternoon.
• highs 65-77 lows 45-54. (seasonal averages high 59 low 47)

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

• Partly cloudy with a good (50%) chance of evening showers, mostly cloudy with rain and snow late tonight (0.25 in. of rain possible, 1 in. of snow possible),
• Mostly cloudy with AM rain and snow showers, rain showers and snow showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Monday afternoon (0.50 in. of rain possible, small hail possible, 2 in. of snow possible), a good (50%) chance of evening rain and snow showers and a slight (20%) of thunderstorms, just mostly cloudy late Monday night (0.25 in. of rain possible, evening small hail possible, 1 in. of snow possible),
• Partly cloudy with slight (20%) chance of showers and a bit warmer Tuesday afternoon, a slight (20%) chance of evening showers, just partly cloudy late at night,
• Mostly sunny start, partly cloudy and a bit warmer with a slight (20%) chance of showers and thunderstorms Wednesday afternoon, a slight (20%) chance of evening showers, then just cloudy late Wednesday night.
• snow level 5,500 ft. tonight, 4,500 ft. Monday and Monday night, 6,000 ft. Tuesday afternoon, 6,000 ft. Tuesday night, 6,500 ft. Wednesday, then 7,000 ft Wednesday night.
• lows 32-28 warming to 35 Wednesday night highs 40-55.
• Some AM clouds, sunny and a bit warmer Thursday afternoon, partly cloudy Thursday night,
• Mostly sunny and a bit warmer Friday, mostly clear at night,
• Mostly sunny and a bit warmer Saturday, clear Saturday night,
• AM sun, then partly cloudy with a (30%) chance of showers Sunday afternoon.
• snow level free air freezing level 9,000 ft. Thursday, 10,000 ft. Thursday night,12,000 ft. Friday, 13,000 ft. Friday night, 14,000 ft. Saturday and Saturday night, then above 8,000 ft. Sunday.
• highs 62-72 lows 38-48.