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 61 in the Moderate category measuring Particulate Matter.

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

Cottage Grove: The Air Quality Index is 52 in the Moderate 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 4 AM SUNDAY FOR CENTRAL DOUGLAS COUNTY, 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:

• Mostly sunny and a bit cooler this afternoon, partly cloudy this evening, mostly cloudy with areas of freezing fog late tonight,
• Cloudy with areas of freezing fog Saturday AM, partly cloudy in the afternoon, partly cloudy with patchy freezing fog late Saturday night,
• Patchy AM freezing fog, mostly cloudy and a bit warmer Sunday, then just mostly cloudy with a slight (20%) chance of showers Sunday night.
• highs 48-46 warming to 50 Sunday lows 30-33.
• A mix of clouds and sun and Monday, partly cloudy at night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday, cloudy with a good (50%) chance of rain Tuesday night,
• Then mostly cloudy and a bit warmer with rain likely (60%) Wednesday through Thursday.
• highs 49-45 lows near 34. (seasonal averages high 49 low 35)

 

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Forecast for Roseburg:

• Partly cloudy and a bit warmer this afternoon, partly cloudy with patchy fog late tonight,
• Partly cloudy with patchy AM fog, 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, then mostly cloudy with patchy fog and freezing fog Sunday night.
• highs 52- 55 cooling back to 52 Sunday lows near 33.
• Mostly cloudy and warmer with patchy AM fog and freezing fog Monday, just partly cloudy in the evening, mostly cloudy at night,
• Mostly cloudy with a slight (20%) chance of rain and a bit cooler Tuesday, cloudy with a (40%) chance of  rain Tuesday night,
• Then mostly cloudy and a bit warmer with rain likely (70%) Wednesday through Thursday.
• highs near 52 lows 35-39. (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 and a bit warmer this afternoon, partly 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,
• Patchy AM and late night fog Sunday otherwise mostly cloudy in the afternoon and at night.
• highs near 55 lows near 38.
• Patchy AM fog, mostly cloudy Monday and at night,
• Mostly cloudy with a slight (20%) chance of rain and a bit cooler Tuesday, cloudy with a good (50%) chance of rain Tuesday night,
• Mostly cloudy with rain likely (70%) Wednesday, then rain Wednesday night and Thursday (a bit cooler.
• highs 55-52 lows 40-42. (seasonal averages high 52 low 40)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy and a bit warmer this afternoon, partly cloudy tonight through Sunday, then mostly cloudy Sunday night.
• free air freezing level 5,000 ft. rising to 7,000 ft. this afternoon, 8,000 ft. falling to 7,500 ft. tonight, 8,000 ft. Saturday, 9,000 ft. Saturday night and Sunday, then 7,500 ft. Sunday night.
• highs 36-44 lows 19-24.
• A mix of clouds and sun Monday, partly cloudy Monday night,
• 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,
• Then rain and snow likely (70%) Wednesday through Thursday.
• free air freezing level 8,000 ft. Monday and Monday night, snow level 5,000 ft. Tuesday and Tuesday night, 4,500 ft. Wednesday, 5,000 ft. Wednesday night, then 4,500 ft. Thursday.
• highs 42-35 lows 28-26.

 

 

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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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