Here is my weekly weather quiz question. What is “Limnology?

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A large Upper Level High Pressure Ridge (“Arch” shape) still has a hold on the Pacific Northwest. Temperatures will cool off just for today. The graphics for days 1-3 show no fronts off the Oregon coast. The graphics for days 3-7 Sunday through next Thursday show a cold front moving through Saturday into next Sunday. Note: Today is the anniversary of the major eruption of Mt. St. Helens 43 years ago on May 18, 1980.

Air Quality Index:

Eugene/Springfield: The Air Quality Index is 37 in the good category measuring Ozone.

Oakridge: The Air Quality Index is 15 in the good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 33 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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ADVISORIES

• NONE AT THIS TIME.

HEALTH ADVISORIES:

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

• A mix of clouds and sun and cooler this afternoon, mostly clear tonight,
• A mix of clouds and sun and a bit warmer Friday afternoon, mostly cloudy at night,
• AM clouds, then partly cloudy and a bit cooler Saturday and Saturday night.
• highs 77-80 cooling to 75 Saturday lows 52-54 cooling back to 52 Saturday night.
• A mix of clouds and sun and a bit cooler Sunday, partly cloudy Sunday night,
• Partly cloudy and a bit cooler Monday, partly cloudy at night,
• Partly cloudy and a bit warmer Tuesday, mostly clear Tuesday night,
• Some AM clouds, then mostly sunny and a bit warmer Wednesday afternoon.
• highs 72-69 warming to 73 Wednesday lows 46-44 warming back to 46 Tuesday night (seasonal averages high 69 low 44)

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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:

• Some AM clouds with patchy fog, sunny and cooler this afternoon, mostly clear this evening, partly cloudy late tonight,
• Some AM clouds, sunny Friday afternoon, mostly clear in the evening, becoming mostly cloudy late at night,
• Then mostly cloudy Saturday and Saturday night.
• highs near 80 lows 55-57 cooling back to 55 Saturday night.
• Mostly cloudy start, partly cloudy and a bit cooler Sunday afternoon, mostly clear Sunday night,
• Some AM clouds, sunny Monday afternoon, mostly clear at night,
• Mostly sunny Tuesday, mostly clear Tuesday night,
• Then mostly sunny and a bit warmer Wednesday.
• highs 73-75 lows 50-47. (seasonal averages high 72 low 48)

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

• Mostly cloudy with areas of AM fog, partly cloudy and a bit warmer with areas of coastal fog this afternoon, mostly cloudy with areas of coastal fog late tonight,
• Mostly cloudy with patchy AM coastal fog while areas of inland AM fog, sunny and a bit warmer Friday afternoon, mostly cloudy at night,
• Then mostly cloudy and a bit cooler Saturday and Saturday night.
• highs 64-66 cooling back to 64 Saturday lows near 52.
• Mostly cloudy start, partly cloudy and a bit cooler Sunday afternoon, mostly clear in the evening, partly cloudy late Sunday night,
• Mostly sunny and a bit cooler Monday, mostly clear at night,
• Mostly sunny Tuesday, mostly clear Tuesday night,
• Some AM clouds, then sunny Wednesday afternoon.
• highs near 64 lows 47-45 warming back to 47 Wednesday. (seasonal averages high 61 low 48)

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

• Some AM clouds, mostly sunny and cooler with a slight chance of showers and thunderstorms this afternoon and evening, just partly cloudy late tonight,
• Mostly sunny start, partly cloudy and a bit warmer with a (40%) chance of showers and a slight (20%) chance of thunderstorms Friday afternoon and evening, just partly cloudy late Friday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday afternoon and evening, then just mostly cloudy late Saturday night.
• snow level above 8,000 ft. today through Saturday night.
• highs 72-75 cooling to 73 Saturday lows near 47.
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Sunday afternoon, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Sunday night,
• Some AM clouds, sunny and a bit cooler Monday afternoon, partly cloudy at night,
• Then mostly sunny and a bit warmer Tuesday and Wednesday, mostly clear Tuesday night,
• snow level above 8,000 ft. Sunday, 7,000 ft. Sunday night, free air freezing level 13,000 ft. Monday and Monday night, 12,000 ft. Tuesday and Tuesday night, then 11,000 ft. Wednesday.
• highs 62-48 warming to 63 Wednesday lows 35-37.