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 moves in for more rain and then cooler temperatures. 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 36 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 21 in the Good category measuring Particulate Matter.

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

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Advisories:

• A HIGH WIND WARNING IS IN EFFECT UNTIL 5 PM TODAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM SUNDAY FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 4 PM SUNDAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS.
• A COASTAL FLOOD ADVISORY IS IN EFFECT UNTIL 3 PM TODAY FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A FLOOD WATCH IS IN EFFECT THROUGH SUNDAY EVENING FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A FLOOD WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY EVENING FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND  JACKSON COUNTY.
• A FLASH FLOOD WATCH IS IN EFFECT FROM THIS AFTERNOON THROUGH SUNDAY EVENING FOR CENTRAL DOUGLAS COUNTY.
• A HIGH WIND WATCH IS IN EFFECT FROM THIS EVENING THROUGH SUNDAY MORNING FOR THE CURRY COUNTY COAST.
• A BLIZZARD WATCH IS IN EFFECT THROUGH SUNDAY MORNING FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTH OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• 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 WINTER STORM WATCH IS IN EFFECT FROM LATE  TONIGHT THROUGH SUNDAY AFTERNOON FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE 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 rain today (0.75 in. of rain possible) and windy (Wind: S 10-15 mph increasing to S 20-30 mph gusts to 40 mph in the afternoon), rain, possibly heavy at times, tonight (1.00 in. of rain possible),
• Mostly cloudy with AM rain, showers and a bit cooler with a slight (20%) chance of thunderstorms Sunday afternoon (0.50 in. of rain, more in storms), mostly cloudy with showers likely (70%) Sunday night and Monday, then a slight (20%) chance of showers in the evening and just mostly cloudy at night.
• highs 50-45 lows 43-35.
• A mix of clouds and sun Tuesday, mostly cloudy with a slight (20%) chance of showers Tuesday night,
• Cloudy with a (40%) chance of rain Wednesday, then mostly cloudy with rain likely (70%) Wednesday night through Friday.
• highs 45-50 cooling to 46 Friday lows 36-39. (seasonal averages high 46 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:

• Rain today (0.50 in. of rain possible, snow level 3,500 ft.), rain, possibly heavy at times, late tonight (0.95 in. of rain possible),
• Mostly cloudy with AM rain, rain and snow showers and a bit cooler Sunday (snow level 3,000 ft. falling to 2,000 ft. in the afternoon, 2-3 in. of snow possible), rain and snow showers with a slight (20%) chance of thunderstorms in the evening (small hail possible), rain and snow showers and colder late Sunday night (snow level 2,500 ft. falling to 2,000 ft. late at night),
• Cloudy with rain and snow showers likely (70%) Monday (snow level 1,500 ft. rising to 2,000 ft. in the afternoon), then mostly cloudy with a (40%) chance of rain and snow showers Monday night.
• highs 50-43 lows 42-33.
• Mostly cloudy Tuesday, a slight (20%) chance of evening rain and snow showers, a slight (20%) chance of rain and snow showers late at night,
• Cloudy with a (30%) chance of rain and snow Wednesday AM, a good (50%) chance of afternoon rain, a bit warmer with a (40%) chance of rain Wednesday night through Thursday night,
• Then mostly cloudy with rain likely (70%) Friday.
• highs 45-48 lows 34-43. (seasonal averages high 48 low 36)

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

• Mostly cloudy and a bit warmer with rain, possibly heavy at times, today, (1.25 in. of rain possible) and breezy (Wind: S 10-20 mph increasing to 20-30 mph this afternoon at the shore while S 10-20 mph inland, gusts to 40 mph), rain, possibly heavy at times, tonight (1.20 in. of rain possible) and breezy (Wind: SW 15-25 mph at the shore shifting W 10-15 mph late while SW 10-15 mph inland shifting W 5-10 mph late),
• Rain Sunday AM, a bit cooler with showers and a slight (20%) chance of thunderstorms in the afternoon (small hail possible), coastal showers with a slight (20%) chance of thunderstorms Sunday night while  (1.25 in. of rain possible, small hail possible) and breezy (Wind: NW 20-25 mph at the shore decreasing to NW 10-15 mph late while NW 10-20 mph inland decreasing to NW 5-10 mph late at night), inland showers with a slight (20%) chance of thunderstorms, showers likely (70%) with a slight (20%) chance of thunderstorms late at night inland, breezy (Wind: NW 15-25 mph decreasing to NW 10-156 mph late at the shore while NW 10-15 mph inland),
• Mostly cloudy with AM coastal showers likely (70%) Monday and showers likely (70%) in the afternoon while inland showers likely (70%), then mostly cloudy with a (40%) chance of showers Monday night.
• highs 54-50 lows 46-40.
• Mostly cloudy Tuesday, a slight (20%) chance of showers Tuesday night,
• Cloudy with a (40%) chance of rain Wednesday through Thursday, rain likely (70%) at night,
• Then mostly cloudy with rain Friday.
• highs 50-54 lows 39-46. (seasonal averages high 51 low 40).

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Forecast for the Cascades in Lane County:

• Mostly cloudy and a bit warmer with rain and snow today (1.00 in. of rain possible, 6-10 in. of snow possible) and breezy (Wind: SW 15-25 mph gusts to 40 mph), rain and snow tonight (2.00 in. of rain possible, 8-14 in. of snow possible) and breezy (Wind: SW 10-20 mph gusts to 35 mph decreasing to SW 5-10 mph late at night),
• Cloudy with AM rain and snow, rain and showers and a bit cooler Sunday afternoon (0.75 in. of rain possible, 4-8 in. of snow possible), snow showers and a bit cooler Sunday night and Monday, then mostly cloudy with a (40%) chance of snow showers in the evening, a slight (20%) chance of snow showers late Monday night.
• snow level 3,500 ft. today, 5,500 ft. tonight, 3,500 ft. falling to 2,000 ft. Sunday afternoon, then at the surface Sunday night through Monday night.
• highs 35-28 lows 30-21.
• Mostly cloudy with a slight (20%) chance of snow showers Tuesday and Tuesday night,
• Cloudy with a (30%) chance of snow Wednesday, snow likely (70%) Wednesday night,
• Rain likely (70%) Thursday, then cloudy with rain and snow likely (70%)  Thursday night and Friday.
• snow level at the surface Tuesday through Wednesday night, 6,500 ft. Thursday, 5,500 ft. Thursday night, then 6,000 ft. Friday.
• highs 28-36 cooling to 33 Friday lows 20-24.

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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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