Here is my weekly weather quiz question for the last time. What is a “Warm Core Low ?” Here is the correct answer. A Warm Core Low is a low pressure area which is warmer at its center than at its periphery. Tropical cyclones exhibit this temperature pattern. Unlike cold core lows, these lows produce much of their cloud cover and precipitation during the nighttime. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good luck.

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An upper level low will slowly migrate eastward through the Pacific Northwest continuing our wet weather. A frontal system moved through Oregon bringing more rain and then cooler temperatures. There will be a short break from the rain Tuesday. Then it’s back to wet weather.  Another frontal system pushes in by the end of the week.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 22 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 61 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 58 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM TODAY FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY AND FOR THE FOOTHILLS OF THE CASCADES IN LANE COUNTY ABOVE 1,500 FT.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 PM TODAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM MONDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 4 AM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM MONDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM TODAY UNTIL 4 AM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT  UNTIL 11 PM TONIGHT FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, AND CENTRAL DOUGLAS COUNTY.
• A FLASH FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING FOR CENTRAL DOUGLAS COUNTY, AND EASTERN CURRY COUNTY.
• A HEALTH ADVISORY CONTINUES FOR SUNSET BAY STATE PARK BEACH LOCATED IN COOS COUNTY FOR HIGHER-THAN-NORMAL FECAL BACTERIA WHICH CAN RESULT IN DIARRHEA, STOMACH CRAMPS, SKIN RASHES, UPPER RESPIRATORY INFECTIONS AND OTHER ILLNESSES. DIRECT CONTACT WITH THE WATER – ESPECIALLY BY CHILDREN AND THE ELDERLY, WHO MAY BE VULNERABLE TO WATERBORNE BACTERIA – SHOULD BE AVOIDED IN THIS AREA UNTIL THE ADVISORY IS LIFTED. VISITORS SHOULD AVOID WADING IN NEARBY CREEKS, POOLS OF WATER ON THE BEACH, OR IN DISCOLORED WATER AND STAY CLEAR OF WATER RUNOFF FLOWING INTO THE OCEAN.

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

• Mostly cloudy with showers and a bit cooler with a slight (20%) chance of isolated thunderstorms this afternoon (0.50 in. of rain, small hail possible), evening showers likely (70%), a good (50%) chance of showers late tonight (0.25 in. of rain possible) and Monday, a slight (20%) chance of showers in the evening and just mostly cloudy with patchy fog Monday night,
• Patchy AM fog, a mix of clouds and sun Tuesday, then mostly cloudy with a slight (20%) chance of rain Tuesday night.
• highs 44-42 warming back to 44 Tuesday lows 35-33.
• Cloudy with a good (50%) chance of rain Wednesday, rain likely (70%) Wednesday night,
• Rain Thursday, cloudy with rain likely (70%) Thursday night,
• Rain likely (60%) Friday and Friday night,
• Then cloudy with a good (50%) chance of rain Saturday.
• highs 45-48 cooling back to 45 Saturday lows 38-44 cooling back to 38 Friday night. (seasonal averages high 45 low 34)

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Home Wood Heating Advisory:

Eugene-Springfield: GREEN – Burning is allowed.

Oakridge: GREEN – Burning is allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA).

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Forecast for Roseburg:

• Mostly cloudy with AM rain and snow with a slight (20%) chance of isolated thunderstorms, rain and snow and a bit cooler with a slight (20%) chance of thunderstorms this afternoon (0.65 in. of rain possible, snow level 400 ft. rising to 1,000 ft. this afternoon, 3-4 in. of snow possible above 1,500 ft., 1 in. of snow possible below 1,500 ft.), rain and snow this evening, rain and snow showers and colder late tonight (0.25 in. of rain possible, 1-2 in. of snow possible, snow level 1,500 ft.),
• AM rain and snow showers, cloudy with rain and snow showers likely (70%) Monday afternoon (snow level 1,500 ft. rising to 2,000 ft. in the afternoon), mostly cloudy with a (40%) chance of rain and snow showers Monday night (snow level 2,000 ft.),
• Mostly cloudy Tuesday, a slight (20%) chance of evening rain and snow showers, then a slight (20%) chance of rain and snow showers late Tuesday night.
• highs 44-42 lows 35-30.
• Cloudy with a (30%) chance of rain Wednesday, rain likely (70%) Wednesday night,
• Mostly cloudy with rain a bit warmer Thursday, rain likely (70%) Thursday night and Friday, cloudy with a good (50%) chance of rain Friday night,
• Then mostly cloudy with rain likely (70%) Saturday.
  highs 44-50 cooling to 47 Saturday lows 39-43 cooling to 40 Friday night. (seasonal averages high 47 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Rain this AM, a bit cooler with coastal rain and a slight (20%) chance of afternoon thunderstorms while rain and snow inland with a slight (20%) chance of thunderstorms this afternoon (0.60 in. of rain possible, small hail possible, snow level 1,500 ft. falling to 2,000 ft. this afternoon), breezy (Wind: increasing to NW 15-25 mph at the shore while NW 10-15 mph, gusty in storms), coastal rain with a slight (20%) chance of evening thunderstorms with showers late tonight while inland rain and snow with a slight (20%) chance of thunderstorms this evening, rain and snow showers late tonight (0.45 in. of rain possible, small hail possible, snow level 2,000 ft.) and breezy (Wind: NW increasing to 15-25 mph at the shore decreasing to NW 10-15 mph late while NW 10-15 mph inland),
• Mostly cloudy Monday with AM coastal showers while AM rain and snow showers inland (0.25 in. of rain possible, AM snow level 1,500 ft.), showers likely (70%) in the afternoon, a (40%) chance of showers Monday night,
• Just mostly cloudy Tuesday, then a slight (20%) chance of showers Tuesday night.
• highs 50-48 lows near 40.
• Cloudy and a bit warmer with a (40%) chance of rain Wednesday, rain Wednesday night and Thursday, rain likely (70%) at night,
• Then mostly cloudy with rain likely (70%) Friday through Saturday.
• highs 50-54 cooling back to 50 Saturday lows 43-47 cooling back to 43 Friday night. (seasonal averages high 51 low 40).

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Forecast for the Cascades in Lane County:

• Cloudy with AM snow, snow showers and cooler this afternoon (0.75 in. of rain possible, 4-8 in. of snow possible), snow showers and cooler tonight (1-4 in. of snow possible),
• Mostly cloudy with snow showers Monday (1-2 in. of snow possible) and in the evening, a slight (20%) chance of snow showers late Monday night,
• Partly cloudy Tuesday, then a slight (20%) chance of snow Tuesday night.
• snow level 2,500 ft. this afternoon, at the surface tonight through Monday night, free air freezing level at the surface Tuesday, then snow level at the surface Tuesday night.
• highs 30-26 warming to 28 Tuesday lows 22-19.
• Cloudy with a (40%) chance of rain and snow and warmer Wednesday, rain and snow likely (70%) Wednesday night,
• Mostly cloudy with rain and snow and a bit warmer Thursday, rain likely (60%) Thursday night and Friday, cloudy with a good (50%) chance of rain and snow Friday night,
• Then cloudy with a good (50%) chance of rain and snow showers Saturday.
• snow level 3,000 ft. Wednesday, 3,500 ft. Wednesday night, 5,500 ft. Thursday, 6,000 ft. Thursday night, 6,500 ft. Friday, 5,000 ft. Friday night, then 4,000 ft. Saturday.
• highs 34-36 cooling to 32 Saturday lows 27-30 cooling 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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