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December warm NOT White


PB GFI

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6 inches  on the fist day with a winter storm warning and then 8 inches the next day with a blizzard warning. :sled:

We had 18 or something like that here b/w the 2 events.  1st came in on the Friday around noon with a good 6-10 inches and then a heavier event the next day...it was all gone with a rainstorm a few days later sadly.

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A NYC December average temperature of 40 degrees has been the cutoff between

an above or below normal snowfall December in the 2000's.

 

NYC average December snowfall 4.8" and average temperature 37.5.

 

Year.....temperature....snowfall

 

2000...31.1....13.4"

2001...44.1....T

2002...36.0....11.0"

2003...37.6....19.8"

2004...38.4......3.0"

2005...35.3......9.7"

2006...43.6......0

2007...37.0.....2.9"

2008...38.1.....6.0"

2009...35.9....12.4"

2010...32.8....20.1"

2011...43.3....0

2012...41.5....0.4"

2013...38.5....8.6"

2014...40.5....1.0"

all the 40 degree and above Decembers had an inch or less of snow...before 2000 the last 10" storm in December was 1960...

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all the 40 degree and above Decembers had an inch or less of snow...before 2000 the last 10" storm in December was 1960...

 

The 2000's Decembers have shown some impressive variability in alternating between snowy and mild years.

About the only type of weather that has been missing so far is the single digit or lower cold. Even readings

below 20 have been fewer compared to earlier years in NYC.

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The 2000's Decembers have shown some impressive variability in alternating between snowy and mild years.

About the only type of weather that has been missing so far is the single digit or lower cold. Even readings

below 20 have been fewer compared to earlier years in NYC.

With the warm AMO that's not surprising, since the 80s we've even been struggling with those temps in January and February

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If one uses today's high and low temperatures (reported through 1 pm) and the MOS data through December 8, the first 8 days of December will average nearly 5.8° above normal. The following temperature anomalies would be need for the remainder of the month for a December monthly anomaly ranging from -1° to +3°:

 

1° below normal: -3.3°

Normal: -2.0°

1° above normal: -0.7°

2° above normal: +0.7°

2.5° above normal (40.0° mean temperature): +1.4°

3° above normal: +2.0°

4° above normal: +3.4°

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The December 500 mb pattern generally looks like a continuation of November.

Split El Nino Aleutian Low near Alaska and the SW US pumping the ridge over

the Northeast. You want to see the trough near Alaska back west from 

mid-January through March and the SW trough kick out to over the SE US.

 

 

 

 

 

 

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The December 500 mb pattern generally looks like a continuation of November.

Split El Nino Aleutian Low near Alaska and the SW US pumping the ridge over

the Northeast. You want to see the trough near Alaska back west from

mid-January through March and the SW trough kick out to over the SE US.

15.gif

ecmwf-ens_z500a_namer_11.png

Therein lies the key. If the one eyed pig doesn't retrograde there is no winter. There's a chance it does and a chance it rots there ala 2011-12
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There is always a chance the forecast doesn't pan out , however 57 67 77 all had terrible Decembers and they turned out OK ( better than OK ).

December 97 was the coldest of the winter months and how did that turn out ?

The guidance retrogrades the pattern at 500 on all but 1 model and ALL the models had warm DECs so non of this is a surprise.

Nothing is certain when it comes to the response of the atmosphere downstream from such a big event so there is always a chance of that 1 model being right. Better to go with the overall guidance , and maybe that's wrong in the end but I will see you in March for that , not Dec 1.

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http://www.cpc.ncep.noaa.gov/products/predictions/610day/

Call FD to complain-----and it comes with a 5/5 confidence level!

http://www.cpc.ncep.noaa.gov/products/predictions/814day/index.php

FD has the blaze 20% contained three days later.

I've never seen them be that confident and so expansive, it's basically a guarantee.

December isn't a winter month anyway so the warmth can happily stick around. It's been so pleasant lately not having to deal with the cold (minus a couple days).

I'm loving this fall extension.

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http://www.cpc.ncep.noaa.gov/products/predictions/610day/

Call FD to complain-----and it comes with a 5/5 confidence level!

http://www.cpc.ncep.noaa.gov/products/predictions/814day/index.php

FD has the blaze 20% contained three days later.

That's pure vomit in your mouth.

Goes along with exactly what I have been saying for a couple months. It's not just the Nino it's the record warm waters off the west coast. Any sort of Sw flow with air originating from there and we recors torch

Personally I'm backing down a tad from my record December to something more like +5 I think there are a couple cold shots towards the end of the month that prevent the record as the pattern starts to change

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The AO index should be go mostly negative after Dec. 17 for the duration, and have the periodic company of a -NAO until Jan. 23 when it too goes negative for the duration.     The 12/23-----early Jan period might be interesting as an appetizer    Sustained activity not till Jan. 23 and satiety not till early April.   LOL.

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The AO index should be go mostly negative after Dec. 17 for the duration, and have the periodic company of a -NAO until Jan. 23 when it too goes negative for the duration. The 12/23-----early Jan period might be interesting as an appetizer Sustained activity not till Jan. 23 and satiety not till early April. LOL.

+AO likely most of the winter unfortunately

http://www.americanwx.com/bb/index.php/topic/47332-winter-2015-2016-medium-term-discussion/?view=getnewpost

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The AO index should be go mostly negative after Dec. 17 for the duration, and have the periodic company of a -NAO until Jan. 23 when it too goes negative for the duration.     The 12/23-----early Jan period might be interesting as an appetizer    Sustained activity not till Jan. 23 and satiety not till early April.   LOL.

The GFS ensembles generally favor a positive AO to the limit of their forecasting range. Typically, with the kind of strong and expansive polar vortex, the guidance rushes the breakdown of the vortex. A mainly positive second half of December is certainly possible if such a timing issue is considered. January remains to be seen.

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if this year is like last year the ao doesn't have to drop to record levels for cold and snow...usually when the ao is at its lowest point of the winter it's usually cold or snowy in the NYC area...Here are the El Nino years with the weather at the time of the ao winter minimum...

1951-52......-3.805.....3/4/1952....4" snow 3/2...
1952-53......-3.766.....12/27/52....12/27...12 degrees is the coldest temp. of the season...4" snow 12/31...
1953-54......-3.495.....1/30/54......Cold snowy January...
1957-58......-4.030.....3/11/58......snow storms 3/14 and 3/21...
1958-59......-4.026.....1/7/59........cold continues...
1963-64......-4.470.....12/20/63....1.4" 12/18...6.6" 12/23-24...11 degrees 12/20 coldest for that month...
1965-66......-5.130.....1/28/66......1/28...8 degrees is the coldest temp. of the season 1/28...storm 7" on 1/30...
1968-69......-5.282.....2/13/69......17 degrees 2/17 is the coldest temp for the month...15" of snow 2/9-10....
1969-70......-6.365.....3/5/70........20 degrees 3/10 coldest temp for the month....
1972-73......-2.044.....12/17/72...24 degrees max 12/17.....
1976-77......-7.433.....1/15/77......-2 degrees on the 17th is the coldest temp of the winter...5" snow 1/14-15...
1977-78......-5.291.....2/5/78........10 degrees 2/5 is the coldest temperature of the season...18" snow 2/6-7...

1979-80......-3.705.....1/24/80......continued cold and dry...longest stretch of cold that winter...
1982-83......-3.410.....2/6/83........4" of snow 2/6 and 18" 2/11-12...
1986-87......-3.507.....3/9/87........2" snow 3/12...Near record cold 3/10...
1987-88......-2.314.....2/28/88......0.6" 2/27 is the last measurable snow...
1991-92......-2.597.....12/4/91.....0.7" 12/5...
1992-93......-2.228.....3/2/93.......Super storm 3/13...Near record cold followed...
1994-95......-3.116.....3/9/95.......20 degrees 3/10 is the coldest temp for the month....
1997-98......-4.269.....1/10/98.....14 degrees New Years day...Coldest of the winter...
2002-03......-3.575.....1/22/03......7 degrees 1/24 is the coldest for the winter...
2003-04......-4.387.....1/17/04......1 degree 1/16 is the coldest temp of the season...6" of snow 1/15...Dec.
2004-05......-4.337.....2/26/05......6" of snow 2/25 and 8" 2/29...
2006-07......-2.184.....2/4/07........8 degrees 2/5 is the coldest for the winter...
2009-10......-5.821.....12/21/09...11" snow 12/19-20....16 degrees 12/18 is the coldest for the month...
2014-15......-1.462.....03/19/15...4.5" of snow March 20th...

........................................................

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