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Feb 12-13 Storm Threat


UlsterCountySnowZ

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6 minutes ago, UlsterCountySnowZ said:

Wow... and it's still snowing moderately for many, for several more hours 

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Could someone please explain synoptically why the colder trends?  Is it that high pressure up north is stronger and in a better position to drain down into a more entrenched CAD setup? Is this setup progged on the NAM and RGEM more consistent with current teleconnections?

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Could someone please explain synoptically why the colder trends?  Is it that high pressure up north is stronger and in a better position to drain down into a more entrenched CAD setup? Is this setup progged on the NAM and RGEM more consistent with current teleconnections?

They are getting there, but not quite there yet. The AO is progged to stay negative (hence pushing it south). The PNA is going increasingly positive (hence the sharpening of the trough, allowing more digging). The NAO is going negative which is slowing all of this down and allowing the storm to strengthen before it escapes into the Gulf of Maine or put East. The Nam and Rgem are also benefitting from new data, as our current storm system is coming out of no man's land and is beginning to actually be sampled. The 18z runs of the GFS also began to pick up on this (though no new data).

Sent from my SAMSUNG-SM-N920A using Tapatalk

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1 minute ago, USCG RS said:


They are getting there, but not quite there yet. The AO is progged to stay negative (hence pushing it south). The PNA is going increasingly positive (hence the sharpening of the trough, allowing more digging). The NAO is going negative which is slowing all of this down and allowing the storm to strengthen before it escapes into the Gulf of Maine or put East. The Nam and Rgem are also benefitting from new data, as our current storm system is coming out of no man's land and is begging to actually be sampled. The 18z runs of the GFS also began to pick up on this (though no new data).

Sent from my SAMSUNG-SM-N920A using Tapatalk
 

Just the answer I was searching, thank you!

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