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bluewave

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The winters of the 2000's have been defined by records being set for snowfall along with

blocking across the northern latitudes of the Atlantic and Pacific. This increase in blocking

through the NAO, AO, PNA, and EPO regions has lead to NYC experiencing an amazing

streak of 11 out the last 15 winters featuring near or above normal snowfall. Numerous

snowfall records from daily to monthly have been set over the last 15 winters.

 

There have been three types of blocking patterns behind this increase in snowfall.

 

One winter composite featured an Atlantic dominated blocking pattern.

 

attachicon.gifA.png

 

 

A second blocking pattern was a split between the Atlantic AO/NAO 

and Pacific EPO/PNA regions.

 

attachicon.gifAP.png

 

 

The third blocking configuration was a Pacific EPO/PNA dominant one

that defined the last two winters.

 

attachicon.gifP.png

 

 

Numerous 500 mb blocking and  teleconnection records were also set

during the 2000's so far. The records are seen in the 500 mb time series

charts.

 

500 mb blocking records in Atlantic and Pacific sectors are shown in the

charts below.

 

Atlantic AO/NAO

 

attachicon.gifATLBLOCKTIME.png

 

Pacific EPO/PNA

 

attachicon.gifPACBLOCKTIME.png

 

 

Only 4 winters since 2000 departed from this common theme 

when no significant Atlantic or Pacific blocking emerged. These were

the 4 below normal snowfall winters in NYC. They were similar to

the dominant pattern of the previous 15 winters which featured

10 below normal snowfall seasons in NYC.

 

attachicon.gifBNNEW.png

 

attachicon.gifBNOLD.png

good post...we have been spoiled recently...

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