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 10 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 70 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 27 in the Good 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 MONDAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS ; UNTIL 4 AM MONDAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS.
• A WINTER STORM WARNING IS IN EFFECT ABOVE 1,000 FT. UNTIL 10 AM MONDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY AND JOSEPHINE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 6 AM MONDAY FOR THE NORTH OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM MONDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND FOR JACKSON COUNTY BELOW 1,500 FT.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• 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 UNTIL 10 PM TONIGHT FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A FLASH FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE 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 tonight (0.10 in. of rain possible),
• A good (50%) chance of showers Monday (0.25 in. of rain possible), a (30%) chance of showers in the evening, just mostly cloudy with patchy fog late Monday night,
• Patchy AM fog, mostly cloudy Tuesday, mostly cloudy with a slight (20%) chance of rain Tuesday night,
• Cloudy with a (30%) chance of rain Wednesday, then rain likely (70%) Wednesday night.
• lows near 36-39 highs 43-45.
• Mostly cloudy with rain and a bit warmer Thursday, rain likely (70%) Thursday night through Friday night,
• Then cloudy and a bit cooler with a good (50%) chance of rain Saturday through Sunday.
• highs 48-45 lows 44-35. (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 rain and snow showers with a slight (20%) chance of thunderstorms 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.),
• Rain and snow showers Monday (1-3 in. of snow possible, 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 rain Tuesday night (snow level 2,000 ft. late at night),
• Cloudy and a bit with a (40%) chance of rain Wednesday, then rain likely (70%) Wednesday night.
• lows 36-30 warming to 40 Wednesday highs 42-44.
• Mostly cloudy with rain and warmer Thursday, rain likely (70%) Thursday night,
• Rain Friday, cloudy with rain likely (70%) Friday night,
• Cloudy a good (50%) chance of rain Saturday, mostly cloudy with a (40%) chance of rain Saturday night,
• Mostly cloudy with a good (50%) chance of AM rain and snow, rain likely (60%) and a bit cooler Sunday afternoon.
  highs 48-50 cooling to 46 Sunday lows 44-36. (seasonal averages high 47 low 36)

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

• Mostly cloudy with showers and a slight (20%) chance of isolated evening thunderstorms, showers late tonight (0.45 in. of rain 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 showers (0.25 in. of rain possible, AM snow level 1,500 ft.), showers likely (70%) in the afternoon, a (30%) chance of showers Monday night,
• Just mostly cloudy Tuesday, then a slight (20%) chance of rain Tuesday night,
• Cloudy and a bit warmer with a (40%) chance of rain Wednesday, then rain Wednesday night.
• lows 42-39 warming to 45 Wednesday night highs 48-52.
• Mostly cloudy and a bit warmer with rain Thursday through Friday, cloudy with a good (50%) chance of rain and cooler Friday night and Saturday, mostly cloudy with a (40%) chance of rain Saturday night,
• Then mostly cloudy with rain likely (70%) Sunday.
• highs 54-50 lows 49-42. (seasonal averages high 51 low 40).

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Forecast for the Cascades in Lane County:

• Cloudy with rain and snow showers this evening, snow showers and cooler tonight (0.25 in. of rain possible, 1-4 in. of snow possible),
• Mostly cloudy with snow showers Monday (2 in. of snow possible), a good (50%) chance of evening snow showers, just mostly cloudy late Monday night,
• A mix of clouds and sun Tuesday, mostly cloudy a slight (20%) chance of snow Tuesday night,
• Cloudy and a bit warmer with a (30%) chance of rain and snow Wednesday, then rain and snow likely (70%) Wednesday 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,
• lows 22-17 warming to 27  Wednesday night highs 28-34.
• Mostly cloudy with rain and snow and a bit warmer Thursday, rain likely (70%) Thursday night and Friday, rain and snow likely (70%) Friday night,
• Cloudy with a good (50%) chance of rain and snow Saturday, a good (50%) chance of snow at night,
• Then cloudy with a good (50%) chance of snow Sunday.
• snow level 5,500 ft. Thursday, 7,000 ft. Thursday night, 6,000 ft. Friday, 4,000 ft. Friday night, 3,500 ft. Saturday, 2,500 ft. Saturday night, then 3,000 ft. Sunday.
• highs 36-30 lows 30-23.

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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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