Here is my weekly weather quiz question. What is“Isentropic Analysis?

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An Upper Level High Pressure Ridge (“Arch” shape) is moving over the Pacific Northwest giving us dry with warmer daytime highs. The graphics for days 1-3 show no frontal activity through the period. The graphics for days 3-7 show an increase in complex frontal systems moving our way Monday through next Friday bringing back the rain chances.

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Air Quality Index:

Eugene/Springfield: The Air Quality Index is 38 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 39 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 48 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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ADVISORIES:

• A FROST ADVISORY IS IN EFFECT FROM 2 AM UNTIL 9 AM TODAY FOR THE SOUTH CENTRAL OREGON COAST.

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

• Mostly sunny with patchy AM frost, partly cloudy and a bit warmer this afternoon (St.Patrick’s Day), becoming mostly cloudy tonight,
• Patchy AM frost, a mix of clouds and sun and a bit warmer Saturday afternoon, a slight (20%) chance of evening rain, a good (50%) chance of rain late Saturday night,
• Mostly cloudy with a good (50%) chance of AM rain, rain and cooler Sunday afternoon, evening rain likely (70%), a good (50%) chance of rain Sunday night.
• highs 60-64 cooling to 54 Sunday lows 34-43.
• Mostly cloudy and a bit cooler with rain likely (70%) Monday, a good (50%) chance of rain Monday night,
• A mix of clouds and sun with a good (50%) chance of rain and a bit cooler Tuesday, mostly cloudy with a good (50%) chance of rain at night,
• Mostly cloudy with a good (50%) chance of AM rain, rain likely (70%) Wednesday afternoon, a good (50%) chance of rain Wednesday night,
• Mostly cloudy with a good (50%) chance of AM rain, then rain likely (70%) and a bit warmer Thursday afternoon.
• highs 52-50 warming to 52 Thursday lows near 36. (seasonal averages high 57 low 37)

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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 (LRAPAz

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Forecast for the Umpqua Valley including Roseburg:

• Partly cloudy with areas of AM fog, partly cloudy and a bit warmer this afternoon (St.Patrick’s Day), mostly cloudy tonight,
• Patchy AM fog, mostly cloudy and a bit warmer Saturday, a (40%) chance of showers at night,
• Mostly cloudy and a bit cooler with showers likely (70%) Sunday, then showers likely (70%) and cooler Sunday night.
• highs 63-65 cooling to 56 Sunday lows 40-45 cooling to 43 Monday night.
• Mostly cloudy and cooler with showers likely (70%) Monday, a good (50%) chance of evening showers, a (%) chance of rain and snow showers Monday night,
• Mostly cloudy and a bit cooler with rain and snow showers likely (70%) Tuesday, rain and snow showers Tuesday night,
• Mostly cloudy and a bit cooler with rain and snow showers likely (70%) Wednesday, a (40%) chance of rain and snow showers Wednesday night,
• Mostly cloudy with a good (50%) chance of AM rain and snow showers, then showers likely (70%) Thursday afternoon.
• highs 54-52 warming back to 54 Thursday lows near 37. (seasonal averages high 59 low 40)

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

• Sunny with areas of AM patchy frost coastal fog and frost while inland areas of AM frost, becoming mostly cloudy this afternoon (St. Patrick’s Day), just mostly cloudy tonight,
• Mostly cloudy with patchy AM coastal fog and frost and a slight (20%) chance of  coastal showers and a bit warmer Saturday afternoon while mostly cloudy with areas of AM inland frost and patchy fog, a slight (20%) chance of inland showers and a bit warmer Saturday afternoon, a good (50%) chance of showers at night,
• Mostly cloudy and a bit cooler with showers Sunday, then showers likely (70%) Sunday night.
• highs 55-57 cooling to 54 Sunday lows 37-42 cooling to 40 Sunday night.
• Mostly cloudy and a bit cooler with showers likely (70%) Monday, a (40%) chance of showers Monday night,
• Mostly cloudy with showers likely (70%) and a bit cooler Tuesday, showers likely (70%) Tuesday night,
• Mostly cloudy with showers likely (70%) Wednesday, a good (50%) chance of showers Wednesday night,
• Mostly cloudy with a good (50%) chance of AM showers, then mostly cloudy and a bit warmer with showers likely (70%) Thursday afternoon.
• highs 52-50 warming back to 52 Thursday lows near 36. (seasonal averages high 55 low 42)

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

• Mostly sunny and a bit warmer today (St. Patrick’s Day), mostly cloudy tonight,
• Partly cloudy Saturday, mostly cloudy with a slight (20%) chance of evening rain and snow, a good (50%) chance of rain and snow Saturday night,
• Mostly cloudy and a bit cooler with rain and snow Sunday, then rain and snow  Sunday night.
• free air freezing level 5,000 ft. rising to 6,500 ft. this afternoon, 7,000 ft. tonight, snow level 6,500 ft. rising to 7,000 ft. Saturday afternoon, snow level 5,000 ft. Saturday night, 5,000 ft. Sunday, then  4,500 ft. Sunday night,
• highs 44-47 cooling to 39 Sunday lows 25-30 cooling to 28 Sunday night.
• Mostly cloudy a bit cooler with snow and rain Monday, evening snow and rain likely (70%), a good (50%) chance of snow and rain late Monday night,
• Mostly cloudy with a good (50%) chance of AM rain and snow, snow and rain likely (70%) Tuesday afternoon and evening, a good (50%) chance of snow late at night,
• Mostly cloudy with snow and a bit cooler Wednesday, evening snow and rain likely (70%), a good (50%) chance of snow late Wednesday night,
• Mostly cloudy with a good (50%) chance of AM snow, then snow and rain likely (70%) Thursday afternoon.
• snow level 3,500 ft. Monday and Monday night, then 2,500 ft. Tuesday through Thursday.
• highs 37-32 warming to 35 Thursday lows 23-20.

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For all of your Eugene-Springfield and Lane County News, Weather, and Sports go to: EugeneDailyNews.com

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