Here is my weekly weather quiz question for the last time. What is “The International Date Line? Here is the correct answer.  The International Date Line is the line of longitude located at 180 degrees East or West (with a few local deviations) where the date changes by a day. West of the line it is one day later than east of the line.

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An Upper Level Low Pressure Trough (“U “shape) moves in to return moisture and another frontal system. The graphics for days 1-3 show the frontal system moving southeastward through Northern California and away from the Pacific Northwest. The graphics for days 3-7 show more frontal activity moving our way Tuesday through next Saturday.

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Air Quality Index:

Eugene/Springfield: The Air Quality Index is 17 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 21 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

NOTE: Outdoor burning remains temporarily prohibited for the following areas: Eugene-Springfield, Florence, Lowell, Oakridge and UGB, and Springfield and UGB.

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

• AM clouds and sun, mostly sunny and a bit cooler this afternoon, partly cloudy with patchy fog late tonight,
• Partly cloudy and a bit warmer Sunday and in the evening, mostly cloudy with a slight (20%) chance of rain late at night,
• Mostly cloudy with rain and a bit cooler Monday, evening rain rain or snow, then rain or snow likely (70%) late Monday night (snow level 500 ft.).
• highs 48-53 cooling to 44 Monday lows 29-38 Sunday night cooling to 30 Monday night.
• Mostly cloudy with showers likely (70%) and a bit cooler Tuesday (snow level 500 ft. rising to 1,000 ft.), partly cloudy Tuesday night,
• A mix of clouds and sun and a bit warmer Wednesday, a slight (20%) chance of evening rain or snow, mostly cloudy with a slight (20%) chance of snow late at night (snow level 1,500 ft. falling to 1,000 ft. late at night),
• Mostly cloudy with a (40%) chance of AM rain or snow (snow level 1,000 ft.), a bit warmer with a (40%) chance of rain Thursday afternoon, a good (50%) chance of rain and snow Thursday night,
• Then mostly cloudy and a bit warmer with a good (50%) chance of rain Friday.
• highs 42-47 lows 23-32. (seasonal averages high 51 low 35)

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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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Forecast for the Umpqua Valley including Roseburg:

• AM clouds, sunny and a bit cooler this afternoon, mostly clear this evening, partly cloudy late tonight,
• AM clouds, sunny and a bit warmer Sunday afternoon, partly cloudy in the evening, mostly cloudy with a (20%) chance of rain late at night,
• Then mostly cloudy and colder with rain and snow and breezy Monday and Monday night.
• highs 49-55 cooling to 45 Monday lows 32-38 cooling back to 32 Monday night.
• Mostly cloudy with AM snow, rain and snow likely (70%) and a bit cooler Tuesday afternoon, partly cloudy with a slight (20%) chance of evening rain and snow showers, partly cloudy and colder Tuesday night,
• Mostly cloudy start, partly cloudy and a bit warmer Wednesday afternoon, partly cloudy with a slight (20%) chance evening rain and snow showers, mostly cloudy with a slight (20%) chance of rain and snow showers late at night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Thursday, a (40%) chance of showers Thursday night,
• Then mostly cloudy with a (40%) chance of rain and snow showers Friday.
• highs 42-48 lows 25-32. (seasonal averages high 53 low 37)

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

• Some AM clouds, sunny this afternoon, mostly clear tonight,
• Sunny and a bit warmer Sunday, partly cloudy in the evening, mostly cloudy with a (20%) chance of showers late at night,
• Mostly cloudy with AM rain likely (70%), rain and a bit cooler Monday afternoon, then rain and snow Monday night.
• highs 52-57 cooling to 50 Monday lows 32-40 cooling to 33 Monday night.
• Mostly cloudy with AM rain and snow, a bit cooler with rain and snow likely (70%) Tuesday afternoon, partly cloudy with a slight (20%) chance of evening rain and snow showers, partly cloudy and colder late Tuesday night,
• Partly cloudy and a bit warmer Wednesday and in the evening, mostly cloudy with a slight (20%) chance of rain and snow showers late at night,
• Mostly cloudy with a slight (20%) chance of AM rain and snow showers, a (40%) chance of showers and a bit warmer Thursday afternoon, a good (50%) chance of showers Thursday night,
• Then mostly cloudy with a (40%) chance of showers Friday.
• highs 46-52 lows 28-34. (seasonal averages high 54 low 41)

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

• Some AM clouds, mostly sunny and a bit cooler this afternoon, mostly clear tonight,
• Mostly sunny and warmer Sunday, partly cloudy in the evening, mostly cloudy with slight (20%) chance of rain or snow late at night,
• Mostly cloudy with AM rain or snow, snow and a bit cooler Monday afternoon (snow possibly heavy at times), then snow Monday night (snow possibly heavy at times in the evening).
• free air freezing level 4,000 ft. rising to 5,000 ft. this afternoon, 5,500 ft. late tonight, free air freezing level 6,000 ft. rising to 10,000 ft. Sunday afternoon, snow level 6,000 ft. Sunday night, 3,000 ft. Monday, then at the surface Monday night.
• highs 39-47 cooling to 32 Monday lows 22-27 cooling to 15 Monday night .
• Mostly cloudy with AM snow showers, cooler with a slight (20%) chance of snow showers Tuesday afternoon, partly cloudy with a slight (20%) chance of evening snow showers, just partly cloudy late Tuesday night,
• Partly cloudy and a bit warmer Wednesday, partly cloudy at night,
• Mostly cloudy with a slight (20%) chance of AM snow, a mix of clouds and sun and a bit warmer with a (40%) chance of rain and snow Thursday afternoon, a (40%) chance of snow Thursday night,
• Then mostly cloudy and a bit cooler with a good (50%) chance of snow Friday.
• snow level at the surface Tuesday, free air freezing level at the surface Tuesday night, free air freezing level at the surface rising to 2,o00 ft. Wednesday afternoon, 3,500 ft. Wednesday night,  snow level 1,500 ft. rising to 3,000 ft. Thursday afternoon, then 2,500 ft. late Thursday night and Friday.
• highs 32-24 warming to 36 Thursday lows 29-14.

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