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.

________________

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.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 6 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 34 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 11 in the Good category measuring Particulate Matter.

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

________________

Advisories:

• 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 10 PM SUNDAY 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 FROM 4 AM SUNDAY 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 FROM 10 PM TONIGHT UNTIL 4 AM MONDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM THIS EVENING FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM SUNDAY 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 SUNDAY 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 FROM 10 PM THIS EVENING UNTIL 10 AM SUNDAY 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 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.

________________

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

• Mostly cloudy with rain, possibly heavy at times, this evening, rain late tonight (1.00 in. of rain possible),
• Mostly cloudy with showers and a bit cooler Sunday afternoon (0.50 in. of rain), evening showers likely (70%), a good (50%) chance of showers late Sunday night and Monday, a slight (20%) chance of showers in the evening and just mostly cloudy Monday night,
• A mix of clouds and sun Tuesday, then mostly cloudy with a slight (20%) chance of showers Tuesday night.
• lows 42-33 highs 44-42 warming back to 44 Tuesday.
• Cloudy with a (40%) chance of rain Wednesday, rain likely (70%) Wednesday night and Thursday, cloudy with a good (50%) chance of rain Thursday night,
• Rain likely (60%) Friday and Friday night,
• Then cloudy with a good (50%) chance of showers Saturday.
• highs 45-48 cooling back to 45 Saturday lows 38-44 cooling back to 38 Friday night. (seasonal averages high 45 low 34)

_____

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).

___________________

Forecast for Roseburg:

• Cloudy with rain, possibly heavy at times, tonight (0.95 in. of rain possible),
• Mostly cloudy with AM rain and snow, rain and snow and  a bit cooler with a slight (20%) chance of thunderstorms Sunday afternoon (snow level 1,500 ft. falling to 2,000 ft. in the afternoon, 5-9 in. of snow possible), rain and snow in the evening, rain and snow showers and colder late Sunday night (2-3 in. of snow possible, snow level 1,500 ft.),
• Cloudy with rain and snow showers likely (70%) Monday (snow level 1,000 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.
• lows 42-30 highs 44-42.
• 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)

________________

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

• Mostly cloudy with 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 coastal rain and a slight (20%) chance of afternoon thunderstorms while rain and snow inland with a slight (20%) chance of thunderstorms in the afternoon (small hail possible), breezy (Wind: increasing to NW 15-25 mph at the shore while NW 10-15 mph and gusty in the afternoon inland), coastal rain with a slight (20%) chance of evening thunderstorms with showers late Sunday night while inland rain and snow with a slight (20%) chance of thunderstorms in the evening, rain and snow showers late at night (1.25 in. of rain possible, small hail possible, snow level 1,500 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 with AM coastal showers while AM rain and snow showers inland (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.
• lows 46-40 highs near 50.
• 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).

________________

Forecast for the Cascades in Lane County:

• Mostly cloudy with rain this evening, rain and snow (2.00 in. of rain possible, 6-15 in. of snow possible above 5,500 ft. while 5-10 in. of snow possible below 5,500 ft.) late tonight (snow possibly heavy at times),
• Cloudy with AM rain and snow, rain and showers and a bit cooler Sunday afternoon (0.75 in. of rain possible, 6-10 in. of snow possible), snow showers and a bit cooler Sunday night (2-5 in. of snow possible),
• Mostly cloudy with snow showers Monday, a good (50%) chance of snow showers in the evening, a slight (20%) chance of snow showers late Monday night,
• Mostly cloudy Tuesday, then a slight (20%) chance of snow showers Tuesday night.
• snow level 5,500 ft. falling to 5,000 ft. late tonight, 3,500 ft. falling to 2,500 ft. Sunday afternoon, at the surface Sunday night through Monday night, free air freezing level at the surface Tuesday, then snow level at the surface Tuesday night.
• lows 30-19 highs 30-26 warming to 28 Tuesday.
• 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 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.

________________

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________