Here is my weekly weather quiz question for the last time. What is the “Thermocline “? Here is the correct answer. The Thermocline : As one descends from the surface of the ocean, the temperature remains nearly the same as it was at the surface, but at a certain depth temperature starts decreasing rapidly with depth. This boundary is called the thermocline. In studying the tropical Pacific Ocean, the depth of 20ºC water (“the 20ºC isotherm”) is often used as a proxy for the depth of the thermocline. Along the equator, the 20ºC isotherm is typically located at about 50 m depth in the eastern Pacific, sloping downwards to about 150 m in the western Pacific.
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The Jet stream is still sending cold air southward into the Pacific Northwest producing cold overnight temperatures and cooler than normal high temperatures. The graphics for days 1-3 show no frontal systems. The graphics for days 3-7 Wednesday through Sunday show no serious frontal activity over the Pacific Northwest until a cold front pushes through between Saturday and next Sunday.
Note: Ski Report: Willamette Pass Ski announced it is open now for early season skiing every day of the week, Hoodoo will be opening open 9am til 4pm Sunday then December 5-8., Mt. Ashland announced opening day will be Friday December 6th. Check their Web sites for specific mountain conditions and hours of operation.
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ADVISORIES:
- A FREEZE WARNING IS IN EFFECT UNTIL 9 AM TODAY FOR THE SOUTH CENTRAL OREGON COAST.
- A FROST ADVISORY IS IN EFFECT UNTIL 9 AM TODAY FOR THE SOUTH CENTRAL OREGON COAST.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 4 PM MONDAY FOR THE PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, INNER PORTLAND METRO, EAST PORTLAND METRO, AND OUTER SOUTHEAST PORTLAND METRO,.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 9 PM MST FRIDAY IN VALLEYS FOR HARNEY COUNTY, BAKER COUNTY, MALHEUR COUNTY, AND THE OREGON LOWER TREASURE VALLEY.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 4 AM THURSDAY FOR THE NORTH OREGON COAST RANGE LOWLANDS, THE CENTRAL OREGON COAST RANGE LOWLANDS, THE LOWER COLUMBIA RIVER, THE TUALATIN VALLEY, THE WEST CENTRAL WILLAMETTE VALLEY, THE EAST CENTRAL WILLAMETTE VALLEY, THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS, THE CLACKAMAS COUNTY CASCADE FOOTHILLS, THE THE CASCADE FOOTHILLS OF MARION AND LINN COUNTIES, AND THE LANE COUNTY CASCADE FOOTHILLS.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 4 PM WEDNESDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, JACKSON COUNTY, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
- AN AIR STAGNATION ADVISORY IS IN EFFECT IS IN EFFECT UNTIL 4 PM WEDNESDAY FOR JACKSON COUNTY.
- A BEACH HAZARDS STATEMENT FOR DANGEROUS SNEAKER WAVES IS IN EFFECT THROUGH THIS AFTERNOON FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
HEALTH ADVISORIES:
- A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER 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.
Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Areas of AM fog and freezing fog, mostly sunny and a bit warmer this afternoon, mostly cloudy with widespread evening fog, areas of dense fog and freezing fog late tonight,
- Widespread dense AM fog and dense freezing fog, sunny Monday afternoon, mostly clear with areas of evening fog, areas of freezing fog late at night,
- Sunny with areas of fog Tuesday, then mostly clear Tuesday night.
- highs near 46 lows 29-32.
- Mostly sunny and a bit warmer Wednesday, partly cloudy in the evening rain, mostly cloudy late Wednesday night,
- Mostly cloudy and a bit warmer with a slight (20%) chance of rain Thursday, a slight (20%) chance of rain at night,
- Mostly cloudy and a bit warmer with a slight (20%) chance of rain Friday, a good (50%) chance of rain Friday night,
- Then mostly cloudy with a (40%) chance of rain Saturday.
- highs 48-56 lows 35-44. (seasonal averages high 49 low 36)
Your College Football Weather Forecast:
Saturday November 30th:
Ducks vs Washington Huskies at Autzen Stadium, – Game time: 4:30 pm- The Ducks Clobbered the Washington Huskies 49-21. Undefeated 12-0 this season. (Next National Champions?)
Friday November 29th:
Beavers vs Boise State Broncos at Maverik Stadium, Boise, Idaho: Game time 9:00 am- The Beavers lost to the Boise State Broncos 34-18.
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HOME WOOD HEATING ADVISORY:
Eugene & Springfield: YELLOW – Caution is advised, be prepared to stop burning wood if the advisory changes to Red.
Oakridge and Westfir: YELLOW – Caution is advised, be prepared to stop burning wood if the advisory changes to Red.
The use of pellet stoves is always allowed.
Data courtesy of Lane Regional Air Protection Agency (LRAPA.org)
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Forecast for the Umpqua Valley including Roseburg:
- Areas of AM fog, partly cloudy and a bit cooler this afternoon, mostly cloudy tonight,
- Some AM clouds with patchy fog, sunny and warmer Monday afternoon, mostly clear with areas of fog at night,
- Widespread AM frost, sunny and a bit cooler with patchy fog Tuesday afternoon, then mostly clear Tuesday night.
- highs 50-52 lows near 36.
- Mostly sunny and a bit warmer Wednesday, mostly clear in the evening, mostly cloudy late Wednesday night,
- Mostly cloudy with a slight (20%) chance of rain Thursday, a slight (20%) chance of rain at night,
- Mostly cloudy with a slight (20%) chance of rain and a bit warmer Friday, a (40%) chance of rain Friday night,
- Then mostly cloudy and a bit cooler with a (30%) chance of rain Saturday.
- highs 53-57 lows 35-42. (seasonal averages high 50 low 38)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Widespread AM coastal while areas of inland AM frost, partly cloudy and a bit warmer this afternoon, mostly cloudy with evening areas of evening frost and patchy fog, partly cloudy with areas of frost and patchy fog late tonight,
- Areas of AM frost, sunny and a bit warmer with patchy coastal fog while sunny with patchy inland fog Monday afternoon, mostly clear with patchy fog at night,
- Patchy AM fog, sunny and a bit warmer Tuesday afternoon, then mostly clear Tuesday night.
- highs 50-60 lows 35-38.
- Areas of AM frost, mostly sunny Wednesday, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of rain late Wednesday night,
- Mostly cloudy a with a (30%) chance of rain Thursday, a (30%) chance of rain at night,
- Mostly cloudy with a (30%) chance of rain Friday, a good (50%) chance of rain Friday night,
- Mostly cloudy with a (40%) chance of rain Saturday.
- highs near 62 lows 42-47. (seasonal averages high 54 low 42)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Sunny and a bit warmer today, partly cloudy tonight,
- Sunny and a bit warmer Monday, mostly clear at night,
- Sunny and a bit cooler Tuesday, then clear Tuesday night.
- free air freezing level 12,000 ft. today, 11,000 ft. falling to 10,000 ft. late tonight, 10,000 ft. rising to 11,000 ft. Monday afternoon, 11,000 ft. falling to 10,000 ft. Monday night, then 11,000 ft. Tuesday and Tuesday night.
- highs 45-47 cooling back to 45 Tuesday lows 28-29.
- Sunny and a bit warmer Wednesday, mostly clear in the evening, partly cloudy Wednesday night,
- AM clouds and sun, mostly cloudy with a (30%) chance of rain and a bit cooler Thursday, mostly cloudy with a (30%) chance of rain at night,
- Mostly cloudy and a bit warmer with a good (50%) chance of rain Friday, a good (50%) chance of rain Friday night,
- Then mostly cloudy and a bit cooler with a good (50%) chance of rain Saturday.
- free air freezing level 11,000 ft. Wednesday and Wednesday night, snow level 7,000 ft. Thursday, 8,000 ft. Thursday night, above 8,000 ft. Friday and Friday night, then 7,500 ft. Saturday.
- highs 47-45 warming to 48 Thursday cooling to 45 Friday lows 32-36.