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February 2016 Forecasts/Disco/Obs


snowman19

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I like whats showing up in the long range after the first week of February +pna, -epo, and perhaps some -nao help in the uber long range. Obviously without much blocking we are going to risk cutters and messy storms. It should be active and we could potentially be setting ourselves up for something bigger in the 2nd half of the month

Any -NAO help, if it happens, would most likely come at the end of February, after mid month. Question at that point (end of February) will be, 1) is there still any cold around and 2) what will the Pacific look like?
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Below is a scatter diagram for NYC's 6" or greater February snowstorms (1950-2015):

 

NYCFeb6_Inch_Snowstorms1950_2015.jpg

 

Most common pattern:

AO-/PNA+ 44% of cases (38% after February 15)

AO-/PNA- 30% of cases (38% after February 15)

AO- 74% of cases

 

As the wave lengths begin to shorten later in the month, the PNA+ becomes less important. The PNA+ was present in 56% of February cases, but 50% after February 15. The AO- remains essentially unchanged in importance throughout the month of February.

 

In sum, after the very warm start for the first few days of February, a colder pattern should produce an increased opportunity for measurable snowfall. Should blocking return, and I still believe that outcome is more likely than not despite the ongoing strong AO+, such opportunities will be higher than climatology, especially as it relates to significant snowfalls.

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Yeah, the pattern looks very stormy in the February 7-11 period. The EPS has two systems now with the first one being

colder around the 7-8 and the second trying to cut a few days later. Really volatile pattern with MJO interacting with

a strong blocking pattern from California across the North Pole. We could see some wild solutions in the 

coming days with so much going on. The core of the  cold should be focused over the Upper Midwest and

Great Lakes with both streams being active.

 

Wild is right the EURO painted a D 8 Blizzard from  SNJ into SNE ... However the EPS was east .

 

 

The OP took SLP down 20 mb in 12 hours and had Hurricane force gusts from CC to just S of LI .

 

The WPO is going to go NEG . So if you give me direct arctic air into the NA and a little  MJO 4- 5- 6 ridging on the EC and you set up 1 hell of a baroclinic fight . 

 

 

gfs-ens_mslpa5d_nhem_12.png

EMON_phase_51m_small.gif

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While the PNA practically goes negative and the NAO stays positive.

Below is a scatter diagram for NYC's 6" or greater February snowstorms (1950-2015):

NYCFeb6_Inch_Snowstorms1950_2015.jpg

Most common pattern:

AO-/PNA+ 44% of cases (38% after February 15)

AO-/PNA- 30% of cases (38% after February 15)

AO- 74% of cases

As the wave lengths begin to shorten later in the month, the PNA+ becomes less important. The PNA+ was present in 56% of February cases, but 50% after February 15. The AO- remains essentially unchanged in importance throughout the month of February.

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While the PNA practically goes negative and the NAO stays positive.

Below is a scatter diagram for NYC's 6" or greater February snowstorms (1950-2015):

NYCFeb6_Inch_Snowstorms1950_2015.jpg

Most common pattern:

AO-/PNA+ 44% of cases (38% after February 15)

AO-/PNA- 30% of cases (38% after February 15)

AO- 74% of cases

As the wave lengths begin to shorten later in the month, the PNA+ becomes less important. The PNA+ was present in 56% of February cases, but 50% after February 15. The AO- remains essentially unchanged in importance throughout the month of February.

 

What of a -NAO? I'm sure that diagram wouldn't be the same if the EPO, NAO, etc... were included.

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The very warm start to February will likely make it difficult for February to wind up much colder than normal, even if a period of cross-polar flow develops near or after mid-month. If the GFS MOS is reasonably accurate, the 2/1-5 anomaly could be around 11° above normal.

 

If the remainder of the month (2/6-2/29) averages normal, February would finish with a monthly anomaly of +1.9°. To achieve a normal outcome, the remainder of the month would need to average 2.3° below normal. Even if the remainder of the month were very cold e.g., 6° below normal--and some very cold shots are plausible if some of the long-range guidance is reasonably accurate--February would wind up with a monthly anomaly of -3.0°. 

 

Courtesy of the El Niño-driven active subtropical jet and the possibility of the redevelopment of blocking, there remains a distinct possibility of above average snowfall, especially in the Middle Atlantic region. 

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The very warm start to February will likely make it difficult for February to wind up much colder than normal, even if a period of cross-polar flow develops near or after mid-month. If the GFS MOS is reasonably accurate, the 2/1-5 anomaly could be around 11° above normal.

It wouldn't surprise me as we've had overperforming warmth all week

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