Here is my weekly weather quiz question for the last time. What is an “Algorithm?” Here is the correct answer. An Algorithm is a computer program (or set of programs) which is designed to systematically solve a certain kind of problem. WSR-88D radars (NEXRAD) employ algorithms to analyze radar data and automatically determine storm motion, probability of hail, VIL, accumulated rainfall, and several other parameters. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer at the bottom of this page. An email will not suffice. 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 upper level low pressure trough (Shaded “U” shape area with blue arrows) is sending more storms our way.  The Days 1,2 & 3 graphic shows the front that moved through and the next one coming on Monday. The graphic for days 3-7 shows the next series of fronts that we will see approaching Wednesday and for next weekend. There will be snow on the Cascade Passes for through the rest of the weekend into next week, BUT so far Willamette Pass and Hoodoo ski areas will not be open. I’d say they need two good snow storms to produce the approximately 30 inches of snow they need to open. Drive carefully! If you need to travel the passes remember this is the first real snow of the season and you will have to be prepared to chain-up if necessary.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 4 in the Good category measuring Particulate Matter.

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

Cottage Grove: The Air Quality Index is 9 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: Green – Burning is allowed.

Oakridge: Yellow – 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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Advisories:

• A HIGH SURF ADVISORY IS IN EFFECT FROM NOON MONDAY UNTIL 1 AM THURSDAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A WINTER STORM WARNING IS IN EFFECT THROUGH 6 PM MONDAY  FOR THE NORTHERN OREGON CASCADES  AND THE CASCADES IN LANE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 1 PM MONDAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTH OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A HIGH WIND WARNING IS IN EFFECT 10 AM MONDAY FOR FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 1 PM MONDAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTH OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A HIGH SURF ADVISORY IS IN EFFECT FROM 1 PM MONDAY THROUGH 10 AM TUESDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WIND ADVISORY IS IN EFFECT FROM 10 AM UNTIL 1 PM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• A Permanent Health Advisory remains 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.
• A Blue-Green Algae Health Advisory remains in effect for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the presence of high levels of blue-green algae and associated toxins that can be harmful to people and animals. Swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing and power boating, should be avoided in areas where blooms are identified. Although toxins are not absorbed through the skin, contact with cells from a bloom can cause skin irritation and a red, puffy rash in individuals with skin sensitivities, or those who develop rashes easily.

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

• Cloudy with evening rain, showers likely (70%) late tonight (0.50 in. of rain possible) and breezy (Wind: SW 15-25 mph gusts to 35 mph decreasing to S 10-15 mph late tonight),
• Mostly cloudy with showers likely (70%) and a bit warmer Monday (0.25 in. of rain possible), a good (50%) chance of evening showers, a slight (20%) chance of showers with areas of fog late Monday night,
• Areas of fog Tuesday AM, a mix of clouds and sun and a bit cooler in the afternoon, mostly cloudy with rain likely (60%) late  at night (0.15 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM rain, a good (50%) chance of showers and a bit warmer Wednesday afternoon, then mostly cloudy with a (40%) chance of showers Wednesday night.
• lows 44-40 warming to 42 Tuesday night cooling to 40 Wednesday night highs 52-49 warming back to 52 Wednesday.
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Thursday, just mostly cloudy at night,
• A mix of clouds and sun and a bit cooler Friday, mostly cloudy with a slight (20%) chance of rain Friday night and Saturday (a bit warmer), a slight (20%) chance of showers Saturday night,
• Then mostly cloudy and a bit cooler with a (40%) chance of showers Sunday.
• highs 50-47 warming to 52 Saturday cooling to 48 Sunday lows 35-42. (seasonal averages high 48 low 36)

 

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Forecast for Roseburg:

• Mostly cloudy with rain (0.25 in. of rain possible) tonight (snow level 3,500 ft. late tonight),
• AM rain and snow showers, rain and a bit warmer Monday afternoon (0.25 in. of rain possible, snow level 3,500 ft.), mostly cloudy with rain and snow showers likely (60%) Monday night (under 0.10 in. of rain possible),
• Mostly cloudy Tuesday, partly cloudy in the evening, becoming mostly cloudy with a good (50%) chance of rain at night (0.15 in. of rain possible),
• Mostly cloudy with AM rain, showers and a bit warmer Wednesday afternoon, then a (40%) chance of rain and snow showers Wednesday night.
• lows 43-37 highs 50-52.
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain and snow showers Thursday, just mostly cloudy with patchy freezing fog late at night,
• Partly cloudy with patchy AM freezing fog, partly cloudy and a bit cooler Friday afternoon, mostly cloudy Friday night and Saturday (a bit warmer), mostly cloudy in the evening, partly cloudy late Saturday night,
• Then mostly cloudy and a bit cooler with a (30% ) chance of rain Sunday.
• highs 52-49 warming to 54 Saturday lows 33-36. (seasonal averages high 50 low 38)

 

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

• Mostly cloudy with rain tonight (0.25 in. of rain possible) and breezy (Wind: SW 20-30 mph decreasing and shifting W 10-20 mph at the shore while W 10-20 mph inland),
• Mostly cloudy with AM showers, rain likely (70%) and a bit warmer Monday (0.25 in. of rain possible), a (30%) chance of showers Monday night (under 0.10 in. of rain possible),
• Mostly cloudy Tuesday AM, partly cloudy in the afternoon, partly cloudy with a slight (20%) chance of coastal evening showers and rain late at night while partly cloudy with a slight (20%) chance of evening inland rain and mostly cloudy with inland rain likely (70%) late Tuesday night (0.50 in. of rain possible),
• Mostly cloudy with AM rain likely (70%), showers and a bit warmer Wednesday afternoon, then a (40%) chance of showers at night.
• lows 47-42 highs near 55.
• Mostly cloudy with a slight (20%) chance of showers Thursday, just mostly cloudy with patchy fog Thursday night,
• Patchy AM fog, partly cloudy and a bit cooler Friday afternoon, mostly cloudy with patchy fog Friday night and Saturday (a bit warmer), partly cloudy with a slight (20%) chance of evening rain, mostly cloudy with a slight (20%) chance of rain with patchy fog late Saturday night,
• Patchy AM fog, then mostly cloudy and a bit cooler with a (40%) chance of rain Sunday.
• highs 54-52 warming to 57 Saturday cooling to 55 Sunday lows 42-45. (seasonal averages high 52 low 41)

 

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Forecast for the Cascades in Lane County:

• Cloudy with snow and rain tonight (1.00 in of rain possible, 6-12 in. of snow possible) and breezy (Wind: w 15-25 mph gusts to 50 mph),
• Snow and rain and a bit cooler Monday (0.75 in. of rain possible, 5-9 in. of snow possible), evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers late Monday night (0.10 in. of rain possible, 1 in. of snow possible),
• A slight (20%) chance of AM rain and snow showers, mostly cloudy and a bit warmer Tuesday afternoon, a good (50%) chance of rain and snow late Tuesday night,
• Mostly cloudy with AM rain and snow likely (70%), rain and snow showers likely (70%) Wednesday afternoon, then cloudy with a good (50%) chance of rain and snow showers Wednesday night.
• snow level 4,500 ft. lowering to 3,500 ft. late tonight, 3,500 ft. Monday through Tuesday, 4,500 ft. Tuesday night, 4,000 ft. Wednesday, then 3,000 ft. Wednesday night.
• lows 30-28 highs 30-33.
• Mostly cloudy and a bit warmer with a (30%) chance of snow showers and a slight (20%) chance of showers Thursday,  just mostly cloudy at night,
• Partly cloudy and a bit warmer Friday, becoming mostly cloudy with a slight (20%) chance of rain and snow Friday  night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain Saturday, partly cloudy with a slight (20%) chance of showers at night,
• Then a mix of clouds and sun and a bit cooler with a (40%) chance of rain and snow showers Sunday.
• snow level 3,000 ft. Thursday, free air freezing level 4,000 ft. Thursday night, 5,000 ft Friday, snow level 5,000 ft. Friday night, 7,000 ft. Saturday, 6,500 ft. Saturday night, then 6,000 ft. Sunday.
• highs 35-42 lows 26-18 warming to 25 Friday 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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