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December 2021


MJO812
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26 minutes ago, forkyfork said:

the gfs shows the problem with a -pna. this wave goes south of us but is too weak and we get light rain. the next wave amplifies and cuts too far west

gfs_mslp_pcpn_frzn_us_22.png

gfs_mslp_pcpn_frzn_us_32.png

everything trends south this year so this is nowhere near the exact solution! this will change 10 times until it actually happens!

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3 hours ago, EastonSN+ said:

I feel like March has surpassed December as a legitimate snowfall month.

Come to think of it, March avg snowfall usually is greater than Dec anyway. I remember when the normal Dec snow was around 2.5", then the next normals update jumped to under 5", thanks to more of the snowy 2000s in the mix. March avg I always remember being around 5".  I don't know what the 90-2020 Dec avgs are by month. The difference between Dec and Mar has become more pronounced now, but I never look at Dec as reliably snowy. It can get decent snow but it feels equally unsurprising to get very little or a trace.  

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16 minutes ago, dWave said:

Come to think of it, March avg snowfall usually is greater than Dec anyway. I remember when the normal Dec snow was around 2.5", then the next normals update jumped to under 5", thanks to more of the snowy 2000s in the mix. March avg I always remember being around 5".  I don't know what the 90-2020 Dec avgs are by month. The difference between Dec and Mar has become more pronounced now, but I never look at Dec as reliably snowy. It can get decent snow but it feels equally unsurprising to get very little or a trace.  

Yeah 2000 and 2010 along with 02, 03, 05 and 09 really skewed those averages. March has remained fairly steady

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25 minutes ago, bluewave said:

No doubt. We will need to weaken the -PNA enough in late December into early January for the -EPO and -NAO to work for us. We can all remember how the models kept showing LR snowstorms through most of December 2010. We had an epic -NAO and -AO but the -PNA shut down the snowfall until the PNA went positive around Christmas. That was a very cold pattern through most of the month but the -PNA messed with the favorable storm tracks.

-PNA - no sign of weakening anytime soon...

Ensemble Mean PNA Outlook

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really great look for us here with the huge -NAO developing. yes, there is a -PNA, but the persistent deep trough over Nova Scotia will likely provide significant confluence, making it difficult for storms to cut W of us

a +PNA with that kind of block would likely lead to suppression (good for the MA/SE) until it decays later on

gfs-ensemble-all-avg-nhemi-z500_anom-1639396800-1639828800-1640779200-10-1.thumb.gif.0aba6a22b935e85db524c1f1fa82e388.gifcmc-ensemble-all-avg-nhemi-z500_anom-1639396800-1639828800-1640779200-10-1.thumb.gif.3a3c36510aa83b9e05a7bd3e50294a05.gif

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1 hour ago, MJO812 said:

We don't want a positive PNA along with a negative epo , AO and NAO. Suppression would be a risk.

Not true. We absolutely want a +PNA. Suppression is always much less of a risk in the NYC than is a hugger. That’s why it never snows in DC and does in New England. Always take the arctic cold and it’ll find a way to snow.

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2 minutes ago, brooklynwx99 said:

really great look for us here with the huge -NAO developing. yes, there is a -PNA, but the persistent deep trough over Nova Scotia will likely provide significant confluence, making it difficult for storms to cut W of us

a +PNA with that kind of block would likely lead to suppression (good for the MA/SE) until it decays later on

gfs-ensemble-all-avg-nhemi-z500_anom-1639396800-1639828800-1640779200-10-1.thumb.gif.0aba6a22b935e85db524c1f1fa82e388.gifcmc-ensemble-all-avg-nhemi-z500_anom-1639396800-1639828800-1640779200-10-1.thumb.gif.3a3c36510aa83b9e05a7bd3e50294a05.gif

Great post 

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1 hour ago, brooklynwx99 said:

really great look for us here with the huge -NAO developing. yes, there is a -PNA, but the persistent deep trough over Nova Scotia will likely provide significant confluence, making it difficult for storms to cut W of us

a +PNA with that kind of block would likely lead to suppression (good for the MA/SE) until it decays later on

gfs-ensemble-all-avg-nhemi-z500_anom-1639396800-1639828800-1640779200-10-1.thumb.gif.0aba6a22b935e85db524c1f1fa82e388.gifcmc-ensemble-all-avg-nhemi-z500_anom-1639396800-1639828800-1640779200-10-1.thumb.gif.3a3c36510aa83b9e05a7bd3e50294a05.gif

Long range eps is also looking better today

 

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