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December 2014 General Discussion


snowlover2

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GFS runs have got a little bit colder in the day 4-5 range with some seriously cold air just on the other side into Canada (850's of -30 deg C)

 

Also looks like its ingesting the snow cover now and creating very cold sfc temps across ND around the same time. 

00z NAM 60-hour forecast for central Ontario around Lake Nipigon is an 850mb temp -33.7C. Little bit chilly for Lake Superior. (Well into the -20s at 850mb over Lake Superior)

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It some respects, this is looking a bit like a La Nina. November 1949, for example, saw colder than average temperatures in my area only for December to warm up quite significantly; it got into the upper 50s on December 22. It will be interesting to see if Toronto hits 60F in December. I hope not, but it would appear possible that it does.

 

http://climate.weather.gc.ca/climateData/dailydata_e.html?timeframe=2&Prov=&StationID=5097&mlyRange=1937-01-01%7C2012-12-01&Year=1949&cmdB1=Go&Month=12&Day=1

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Nah, the projected pattern looks nothing like a December Nina. Here's December 1949...cold in a lot of Canada and into the northern Plains.  

 

 

If the ensembles are to be believed, this would be the look for this December by mid-month below. Granted I'm not saying a repeat of December 2006 is upon us, but the greatest positive departures look to be in western/central Canada and then into the northern Plains/upper Midwest. Pretty classic Nino.

 

 

 

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Nah, the projected pattern looks nothing like a December Nina. Here's December 1949...cold in a lot of Canada and into the northern Plains.  

 

attachicon.gifdec 1949.png

 

If the ensembles are to be believed, this would be the look for this December by mid-month below. Granted I'm not saying a repeat of December 2006 is upon us, but the greatest positive departures look to be in western/central Canada and then into the northern Plains/upper Midwest. Pretty classic Nino.

 

attachicon.gifdec 2006.png

 

What we're in right now though does resemble more of what you think of as a typical Nina pattern, with the pronounced cold north/warm south gradient.

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What we're in right now though does resemble more of what you think of as a typical Nina pattern, with the pronounced cold north/warm south gradient.

 

I suppose so, but I'm thinking more down the road towards mid-month...as I said in my post.

 

This doesn't say Nina to me. 5-10 and 10-15 day 2m departures from the 12z GEFS.

 

 

 

 

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If the ensembles are to be believed, one of our analog years may very well have to be 1923. Note how warm the month was overall and how some of the warmest readings were between the 8th and the 13th. I'm not sure if 1923-1924 was an El Nino, though.

 

http://climate.weather.gc.ca/climateData/dailydata_e.html?timeframe=2&Prov=ONT&StationID=5051&dlyRange=1840-03-01%7C2013-12-10&cmdB1=Go&Year=1923&Month=12&Day=30

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1923-24 was a Nino.

Interesting. I checked the Toronto stats for January and February 1924 and, while it wasn't overly cold, there was a fair bit of snow (61cm in January and 82cm in February). Really interesting how there have been Nino winters in the distant past - including 1855-1856 and 1923-1924 - which have seen torch Decembers only to be followed by decent January and Februaries.

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Interesting. I checked the Toronto stats for January and February 1924 and, while it wasn't overly cold, there was a fair bit of snow (61cm in January and 82cm in February). Really interesting how there have been Nino winters in the distant past - including 1855-1856 and 1923-1924 - which have seen torch Decembers only to be followed by decent January and Februaries.

Another winter is 1911-12. Very mild December followed by a very cold January and February (especially January).

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Ottawa went from one of its mildest Decembers on record in 1923 to a very cold and snowy January 1924. Take a look at these observations for that month. Over 100cm of snow and a mean of minus 11C. Now that's what I call a blockbuster month!

 

http://climate.weather.gc.ca/climateData/dailydata_e.html?timeframe=2&Prov=ONT&StationID=4333&dlyRange=1889-11-01%7C2014-01-30&Year=1924&Month=1&cmdB1=Go&Day=1

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Another winter is 1911-12. Very mild December followed by a very cold January and February (especially January).

Interesting find. 1911-1912 was indeed very cold in Ontario, apart from December. I watched a documentary a couple of years ago which said that that winter had been above average in the high arctic and that the iceberg which sank the Titanic had broken off from an ice field as a result.

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Its been a COLD 2014 in Detroit. I was checking what it would take for this year to place in the top 20 coldest years (since 1874), which would be the first time since 1980. Only 6 of the 20 coldest years on record occurred since 1926!

 

For Detroit to place at 20th coldest, December would have to avg 34.4F, which is 4.1F ABOVE normal

For Detroit to place at 15th coldest, December would have to avg 29.6F, which is 0.5F BELOW normal

For Detroit to place at 10th coldest, December would have to avg 27.2F, which is 2.9F BELOW normal

For Detroit to place at 5th coldest, December would have to avg 20.0F, which is 10.1F BELOW normal.

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