Here is my weekly weather quiz question. What is an “Air Mass Thunderstorm?” Please remember to post your answer at the bottom of this page. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An approaching Upper Level High Pressure Ridge (Shaded “Arch” shape with blue arrows) helped push a frontal system through the Pacific Northwest. The graphic for days 3-7 shows more complex frontal systems heading our way early next week. For mountain snow conditions at the local ski areas check out their websites or give them a call.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 80 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Home Wood Heating Advisory:

Eugene-Springfield: YELLOW – Caution is Advised.

Oakridge: YELLOW – Caution is Advised.

*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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Advisories:

• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL NOON TUESDAY FOR THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE NORTHERN OREGON CASCADE FOOTHILLS, AND THE CASCADE FOOTHILLS IN LANE COUNTY.
• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 1 PM SUNDAY FOR CENTRAL DOUGLAS COUNTY.
• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 1 PM TUESDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, JACKSON COUNTY, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

 

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

• Partly cloudy this evening, mostly cloudy with patchy evening fog, areas of freezing fog late tonight and Saturday AM, a mix of clouds and sun and cooler with patchy lingering fog in the afternoon, partly cloudy with patchy evening fog, areas of freezing fog late Saturday night and Sunday AM, a mix of clouds and sun and a bit warmer in the afternoon, mostly cloudy in the evening, partly cloudy with patchy fog late Sunday night,
• Patchy AM fog, then mostly cloudy and a bit warmer Monday and at night.
• lows 29-35 highs 43-49.
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday, cloudy with a good (50%) chance of rain Tuesday night and Wednesday, then mostly cloudy with rain likely (70%) Wednesday night through Friday.
• highs 48-50 lows 35-37. (seasonal averages high 49 low 35)

 

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Forecast for Roseburg:

• Partly cloudy with areas of fog late tonight and Saturday AM, partly cloudy and a bit warmer Saturday afternoon, mostly clear in the evening, partly cloudy with patchy fog late Saturday night,
• Mostly cloudy with patchy fog Sunday AM, partly cloudy and a bit cooler in the afternoon, mostly cloudy with patchy fog and freezing fog Sunday night,
• Mostly cloudy with patchy AM fog and freezing fog Monday, then just partly cloudy in the evening, mostly cloudy at night.
• lows 34-36 highs 52-50.
• Mostly cloudy with a (40%) chance of rain and a bit cooler Tuesday, cloudy with a (40%) chance of  rain Tuesday night,
• Then mostly cloudy with rain likely (70%) Wednesday through Friday.
• highs 52-50 lows 37-42. (seasonal averages high 51 low 37)

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

• Partly cloudy this evening, mostly cloudy with patchy coastal fog while areas of inland fog late tonight and Saturday AM, partly cloudy Saturday afternoon, mostly clear in the evening, partly cloudy with patchy fog late at night,
• Partly cloudy with patchy AM fog, mostly cloudy Sunday afternoon and at night with patchy fog late,
• Patchy AM fog, then mostly cloudy Monday and at night.
• lows 37-40 highs near 56.
• Mostly cloudy with a slight (20%) chance of rain and a bit cooler Tuesday, rain likely (70%) Tuesday night and Wednesday, rain Wednesday night,
• Rain and breezy Thursday and at night,
• Then mostly cloudy with rain likely (70%) Friday.
• highs 54-52 lows 42-46. (seasonal averages high 52 low 40)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy tonight through Sunday, mostly cloudy Sunday night,
• A mix of clouds and sun Monday, then partly cloudy Monday night.
• free air freezing level 7,000 ft. falling to 6,500 ft. tonight, 8,000 ft. Saturday, 9,000 ft. Saturday night, 9,000 ft. rising to 10,000 ft. Sunday afternoon, 8,000 ft. falling to 7,500 ft. Sunday night, 8,000 ft. rising to 9,000 ft. Monday, then 7,000 ft. Monday night.
• lows 26-32 cooling to 25 Monday night highs near 44.
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain and snow Tuesday, cloudy with a good (50%) chance of rain and snow Tuesday night,
• Cloudy and a bit cooler with a good (50%) chance of rain and snow Wednesday, then rain and snow likely (70%) Wednesday night through Friday (a bit cooler).
• snow level 6,000 ft. Tuesday, 5,500 ft. Tuesday night, 4,500 ft. Wednesday, 5,000 ft. Wednesday night, 4,500 ft. Thursday, 5,000 ft. Thursday night, then 4,500 ft. Friday.
• highs 39-36 lows 26-30 cooling back to 26 Thursday night.

 

 

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

 

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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