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 Tuesday through Saturday show no serious frontal activity over the Pacific Northwest through the period. A cold front will be to our Northwest next Saturday.
Note: Ski Report: Willamette Pass Ski announced it is open now for early season skiing, Hoodoo will be opening open today and Sunday, 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 FREEZING FOG ADVISORY IS IN EFFECT UNTIL 10 AM TODAY FOR THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON.
- A DENSE FOG ADVISORY IS IN EFFECT UNTIL 11 AM TODAY FOR JACKSON COUNTY.
- 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 KLAMNATH 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 FROM THIS EVENING THROUGH SUNDAY 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:
- AM clouds with widespread dense AM fog and areas of dense freezing fog, mostly sunny and a bit warmer this afternoon, mostly clear with patchy evening fog and widespread dense freezing fog with patchy fog, partly cloudy with widespread dense frost late tonight,
- Mostly cloudy with AM dense freezing fog and patchy fog, mostly sunny and a bit warmer Sunday afternoon, partly cloudy with areas of fog and areas of freezing fog late at night,
- Widespread dense freezing fog with areas of dense fog, mostly sunny and a bit warmer Monday afternoon, mostly clear in the evening, then partly cloudy with patchy fog Monday night.
- highs 42-45 cooling to 43 Monday lows 28- 30.
- Mostly sunny and a bit cooler Tuesday, mostly clear Tuesday night,
- Mostly sunny and a bit warmer Wednesday, partly cloudy with a slight (20%) chance of evening rain, mostly cloudy with a slight (20%) chance of rain late at night,
- Mostly cloudy and a bit warmer with a slight (20%) chance of rain Thursday, a slight (20%) chance of rain Thursday night,
- Then mostly cloudy and a bit warmer with a (40%) chance of rain Friday.
- highs 47-55 lows 30-39. (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- Weather forecast: Mostly sunny then mostly clear, 44 degrees and falling throughout the game. It will be quite chilly so dress appropriately.
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:
- Widespread AM frost and areas of dense fog, sunny and a bit warmer with areas of dense fog this afternoon, mostly clear with areas of evening frost and patchy fog, sunny with areas of dense fog this afternoon, areas of evening frost with patchy fog and widespread frost late tonight,
- Sunny with widespread AM frost and patchy fog, partly cloudy and a bit warmer Sunday, partly cloudy with patchy evening, areas of frost late at night,
- Widespread AM frost, sunny Monday afternoon, then mostly clear with areas of frost Monday night.
- highs 50-52 lows 32-34.
- Widespread AM frost, sunny and a bit warmer Tuesday afternoon, mostly clear with areas of frost Tuesday night,
- Areas of AM frost, sunny and a bit warmer Wednesday afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers at night,
- Mostly cloudy with a slight (20%) chance of showers Thursday and Thursday night,
- Then mostly cloudy and a bit with a slight (20%) chance of showers Friday.
- 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 frost and patchy fog, sunny and a bit warmer this afternoon, mostly clear with areas of frost tonight,
- Areas of AM frost, partly cloudy and a bit warmer Sunday, patchy evening fog, partly cloudy with areas of frost late at night,
- Areas of AM frost, mostly sunny and a bit warmer Monday afternoon, then mostly clear with areas of frost Monday night.
- highs 55-57 lows 30-36.
- Partly cloudy with areas of AM frost, mostly sunny and a bit warmer Tuesday afternoon, mostly clear Tuesday night,
- Areas of AM frost, sunny Wednesday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers at night,
- Mostly cloudy and a bit warmer with a (30%) chance of showers Thursday, a (30%) chance of showers Thursday night,
- Then mostly cloudy with a (30%) chance of showers Friday.
- highs 58-60 lows 37-44. (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, mostly clear tonight,
- Sunny and a bit warmer Sunday, partly cloudy at night,
- Sunny and a bit cooler Monday, then mostly clear Monday night.
- free air freezing level 10,000 ft. rising to 11.000 ft. this afternoon, 11,000 ft. tonight and Sunday, 11,000 ft. falling to 10,000 ft. late Sunday night, then 11,000 ft. Monday and Monday night.
- highs 44-46 cooling back to 44 Monday lows 27-25 Monday night.
- Sunny Tuesday, mostly clear Tuesday night,
- Mostly sunny and a bit warmer Wednesday, partly cloudy with a slight (20%) chance of evening rain, mostly cloudy with a slight (20%) chance of rain late at night,
- A mix of clouds and sun with a (30%) chance of rain and a bit cooler Thursday, mostly cloudy with a (30%) chance of rain Thursday night,
- AM clouds and sun with a (40%) chance of rain, then mostly cloudy and a bit warmer with a (40%) chance of rain Friday afternoon.
- free air freezing level 12,000 ft. Tuesday through Wednesday, snow level 7,500 ft. Wednesday night and Thursday, then above 8,000 ft. Thursday night and Friday.
- highs 45-48 cooling to 46 Thursday warming to 48 Friday lows 29-34.