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) a frontal; system toward us as shown on the days 1-3 graphic. The graphic for days 3-7 shows more frontal systems heading our way that will try to break through blocking surface high pressure Sunday through Tuesday of 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 28 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 96 in the Moderate 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 FROM 10 PM THURSDAY UNTIL 4 AM SUNDAY FOR THE SOUTH CENTRAL OREGON COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, JACKSON COUNTY, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS, 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 cloudy and a bit cooler today with a (40%) chance of showers and possible sun peeks, cloudy with a (40%) chance of evening rain, a (40%) chance of showers late showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM showers, a mix of clouds and sun and a bit warmer Thursday afternoon, partly cloudy with areas of freezing fog late Thursday night,
• Partly cloudy with patchy freezing fog Friday AM, mostly sunny and a bit cooler in the afternoon, partly cloudy in the evening, then mostly cloudy with patchy freezing fog late Friday night.
• highs 48-50 cooling back to 48 Friday lows 33-28.
• Mostly cloudy with patchy freezing fog Saturday AM, mostly sunny and a bit cooler  Saturday afternoon, just party cloudy Saturday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Sunday, a (30%) chance  of showers Sunday night,
• A mix of clouds and sun and a bit cooler Monday, partly cloudy at night,
• Then mostly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday.
• highs 46-50 cooling back to 46 Tuesday lows 32-35 cooling back to 32 Monday night. (seasonal averages high 48 low 35)

 

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Forecast for Roseburg:

• Mostly cloudy with areas of AM freezing fog, a bit cooler with a slight (20%) chance of rain this afternoon, cloudy with a (30%) chance of rain and snow showers tonight (under 0.10 in. of rain possible, snow level 2,500 ft.),
• Mostly cloudy with a slight (20%) chance of AM rain and snow showers (snow level 2,000 ft.), just partly cloudy and a bit warmer Thursday afternoon, partly cloudy with patchy freezing fog late Thursday night and Friday AM, partly cloudy and a bit warmer Friday afternoon, then partly cloudy with patchy freezing fog late at night.
• highs 47-52 lows 35-32 warming to 34 Friday night.
• Partly cloudy with patchy AM freezing fog, partly cloudy and a bit cooler Saturday afternoon, patchy freezing fog late at night,
• Mostly cloudy and a bit warmer Sunday, mostly cloudy with a slight (20%) chance of showers Sunday night,
• Just mostly cloudy and cooler Monday, partly cloudy at night,
• Then mostly cloudy with a slight (20%) chance of rain and a bit cooler Tuesday.
• highs 50-53 cooling to 48 Tuesday lows near 35. (seasonal averages high 51 low 37)

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

• Partly cloudy with areas of inland freezing fog this AM, mostly cloudy with a slight (20%) chance of rain and a bit cooler this afternoon (under 0.10 in. of rain possible), cloudy with a (40%) chance of rain tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of AM coastal showers Thursday while a slight (20%) chance of AM inland showers, partly cloudy in the afternoon and Thursday night with patchy inland freezing fog late,
• Partly cloudy with patchy AM freezing fog, just partly cloudy and a bit warmer in the afternoon, then partly cloudy with patchy freezing fog late Friday night.
• highs 50-52 lows 40-37 warming to 39 Friday night.
• Patchy AM freezing fog, partly cloudy Saturday afternoon, partly cloudy with patchy freezing fog at night,
• Mostly cloudy with a slight (20%) chance of rain and a bit warmer Sunday, a slight (20%) chance of showers Sunday night,
• Mostly cloudy and a bit warmer Monday, mostly cloudy at night,
• Then mostly cloudy with a (30%)  chance of rain and a bit cooler Tuesday.
• highs 54-56 cooling to 53 Tuesday lows 42-40 warming back to 42 Monday night. (seasonal averages high 52 low 40)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy and a bit warmer with a slight (20%) chance of isolated snow showers today, cloudy with a (30%) chance of snow showers tonight,
• Mostly cloudy with a (30%) chance of rain and snow showers Thursday AM, just mostly cloudy in the afternoon, partly cloudy and cold at night,
• Mostly sunny and a bit warmer Friday, then partly cloudy  Friday night.
• snow level at the surface today, 2,500 ft. tonight, 3,000 ft. Thursday, free air freezing level 5,000 ft. falling to 4,500 ft. Thursday night, 7,000 ft. Friday and Friday night.
• highs 30-35 lows 22-19 warming to 24 Friday night.
• Partly cloudy Saturday AM, mostly sunny in the afternoon, partly cloudy Saturday night,
• A mix of clouds and sun Sunday, cloudy with a (30%) chance of rain or snow showers at night,
• A mix of clouds and sun Monday, partly cloudy Monday night,
• Then mostly cloudy with a slight (20%) chance of rain or snow Tuesday.
• free air freezing level 7,000 ft. Saturday, 9,000 ft. Saturday night and Sunday, snow level 6,000 ft. Sunday night, free air freezing level 7,500 ft. Monday and Monday night, then snow level 5,000 ft. Tuesday.
• highs 42-36 lows 27-24 warming back to 47 Tuesday.

 

 

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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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