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 FROM 9 PM TONIGHT UNTIL 9 AM MONDAY FOR THE SOUTH CENTRAL OREGON COAST.
- A DENSE FOG ADVISORY IS IN EFFECT UNTIL 11 AM MONDAY FOR THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS, AND THE LANE COUNTY LOWLANDS.
- A DENSE FOG ADVISORY IS IN EFFECT UNTIL 11 AM MST MONDAY IN VALLEYS FOR THE OREGON LOWER TREASURE VALLEY.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 4 AM THURSDAY FOR THE BENTON COUNTY LOWLANDS, THE LINN COUNTY LOWLANDS, AND THE LANE COUNTY LOWLANDS.
- A FREEZING FOG ADVISORY IS IN EFFECT UNTIL 11 AM MONDAY FOR THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, NORTH CENTRAL OREGON, AND CENTRAL OREGON.
- A FROST ADVISORY IS IN EFFECT FROM 9 PM TONIGHT UNTIL 9 AM MONDAY FOR THE SOUTH CENTRAL OREGON COAST.
- AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 9 PM MST FRIDAY IN VALLEYS FOR 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 UNTIL 9 PM MST IN VALLEYS FOR HARNEY COUNTY, BAKER COUNTY. AND MALHEUR COUNTY.
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:
- Mostly cloudy with areas of fog tonight,
- Cloudy with areas of AM fog, sunny Monday afternoon, mostly clear patchy fog late Monday night,
- Patchy dense AM fog, sunny and a bit warmer Tuesday afternoon, mostly clear with patchy fog at night,
- Patchy dense AM fog, sunny Wednesday, then mostly cloudy with patchy fog and a (30%) chance of rain Wednesday night.
- lows 29-36 highs 37-46.
- Mostly cloudy and a bit cooler with patchy fog and a (30%) chance of rain Thursday, a slight (20%) chance of rain Thursday night,
- Mostly cloudy and a bit warmer with a slight (20%) chance of rain Friday, a good (50%) chance of rain Friday night,
- Mostly cloudy and a bit cooler with rain likely (70%) Saturday, a good (50%) chance of rain Saturday night,
- Mostly cloudy with a (30%) chance of AM rain, then mostly sunny and a bit cooler with a (30%) chance of rain Sunday afternoon.
- highs 54-57 cooling to 52 Sunday lows 43-45 cooling to 42 Saturday night. (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:
- Partly cloudy and patchy dense evening fog, mostly cloudy with areas of dense fog late tonight,
- Some AM clouds with patchy fog, sunny and warmer Monday afternoon, partly cloudy with areas of fog and freezing fog late Monday night,
- Partly cloudy with areas of AM fog and freezing fog, mostly sunny with patchy fog Tuesday afternoon, mostly clear with patchy fog late at night,
- Patchy AM fog, sunny and a bit warmer Wednesday, partly cloudy with a slight (20%) chance of evening rain, then mostly cloudy with a slight (20%) chance of rain late Wednesday night.
- lows 34-36 highs 48-52.
- Mostly cloudy with a slight (20%) chance of rain and a bit warmer Thursday, a slight (20%) chance of rain Thursday night,
- Mostly cloudy with a slight (20%) chance of rain and a bit warmer Friday, a slight (20%) chance of rain at night,
- Mostly cloudy and a bit cooler with a good (50%) chance of rain Saturday, a (40%) chance of rain Saturday night,
- Then mostly cloudy and a bit cooler with a slight (20%) chance of rain Sunday.
- highs 55-60 cooling to 54 Sunday lows 45-47 cooling to 44 Saturday night. (seasonal averages high 50 low 38)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Partly cloudy with areas of frost and patchy fog tonight,
- Partly cloudy with areas of AM coastal frost and patchy fog while partly cloudy with inland areas of AM frost, sunny and a bit warmer Monday afternoon, mostly clear with patchy coastal fog at night while mostly clear with inland areas of freezing fog and patchy fog late Monday night,
- Patchy AM coastal fog while areas of AM inland freezing fog and patchy fog, sunny and a bit warmer Tuesday afternoon, mostly clear with patchy coastal fog late at night,
- Areas of AM fog, sunny and a bit cooler Wednesday, then mostly cloudy with a (30%) chance of rain Wednesday night.
- lows 33-30 warming to 42 Wednesday night highs 52-57 cooling to 55 Wednesday.
- Mostly cloudy and a bit warmer with a (30%) chance of rain Thursday, a (30%) chance of rain Thursday night,
- Mostly cloudy and a bit warmer with a slight (20%) chance of rain Friday, cloudy with a (40%) chance of rain at night,
- Mostly cloudy and a bit cooler with rain likely (70%) Saturday, a (40%) chance of rain Saturday night,
- Then mostly cloudy and a bit cooler with a (30%) chance of rain Sunday.
- highs 59-63 cooling to 58 Sunday lows 46-49 cooling to 44 Saturday night. (seasonal averages high 54 low 42)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Partly cloudy tonight,
- Sunny and a bit warmer Monday, clear Monday night,
- Sunny and a bit warmer Tuesday, mostly clear at night,
- Sunny and a bit warmer Wednesday, partly cloudy with a (40%) chance of evening rain, then mostly cloudy with a (40%) chance of rain Wednesday night.
- free air freezing level 11,000 ft. falling to 10,000 ft. late tonight, 11,000 ft. Monday, 10,000 ft. Monday night, 11,000 ft. Tuesday through Wednesday, then snow level 7,000 ft. Wednesday night.
- lows 27-30 highs 46-48.
- A mix of clouds and sun with a (40%) chance of rain and a bit cooler Thursday, mostly cloudy with a (30%) chance of rain Thursday night,
- AM clouds and sun with a slight (20%) chance of rain, mostly cloudy and a bit warmer with a slight (20%) chance of rain Friday afternoon, a good (50%) chance of rain Friday night,
- Mostly cloudy and a bit cooler with rain likely (70%) Saturday, mostly cloudy a good (50%) chance of rain and snow Saturday night,
- Then a mix of clouds and sun with a good (50%) chance of rain and snow Sunday.
- snow level 7,500 ft. Thursday, above 8,000 ft. Thursday night through Friday night, 8,000 ft. Saturday, 6,500 ft. Saturday night, then 5,500 ft. Sunday.
- highs 44-47 cooling to 42 Saturday lows 32-36 cooling to 29 Saturday night.