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E PA/NJ/DE Winter 2020/2021 OBS Thread


Rtd208
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8 minutes ago, Ralph Wiggum said:

Ensembles are beginning to highlight the week following Christmas for a favorable pattern for POTENTIAL winter storm evolution.

Front comes thru Christmas morning  and associated slp heads towards Nova Scotia and begins to pump a ridge near Southern Greenland over the weekend (east-based -NAO?). 

By the time Monday the 28th rolls around there is a blocking pattern established in the NAO region (east?). This is the period to watch (Dec 28-Jan 3) as disturbances head across the country and run into the block. Potential is high based on these looks for one of the disturbances to connect IF the blocky looks continue in the NAO. AO is neutral to slight negative, PNA ridge is trying to pump, Aleutian low is present, and there is a weak split flow off the West Coast. All are favorable teleconnections. Keep in mind this doesn't always yield a storm but these are the drivers that many look for when discussing Northeast winter storm potential. 

GEFS is the most aggressive wrt actually honing in on a specific threat

gfs-ememb_lowlocs_us_38.png

gfs-ens_mslpa_us_38.png

ecmwf-ens_z500a_nhem_10.png

gem-ens_z500a_nhem_37.png

^ "This is the period to watch (Dec 28-Jan 3)"

DT got a bit excited about this time period overnight...

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12 minutes ago, Birds~69 said:

Some precip moving up...not sure if it's making it to the ground.(dreaded virga)

26F

vir.jpg

I'll be getting out the snow-noculars shortly. Snow in the air would be nice, a little fresh coating even better. Had some deer out back last night around 9 pm, one came within about 40 ft. of us, checking things out. Nice!

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1 minute ago, KamuSnow said:

I'll be getting out the snow-noculars shortly. Snow in the air would be nice, a little fresh coating even better. Had some deer out back last night around 9 pm, one came within about 40 ft. of us, checking things out. Nice!

They're great just chillin out and walking around. They suck doing 65mph and dart in front of you. Nailed one on Rt 422 back in the 90s....scared the bejesus outta me!

26F

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33 minutes ago, Birds~69 said:

^ "This is the period to watch (Dec 28-Jan 3)"

DT got a bit excited about this time period overnight...

Is he hugging the Euro op? Because the EPS aren't quite as intense looking as the op. Both GFS/Euro op are more blocky and better positioning but a little far out to be using the op as gospel. If the block is too far East that is one possible way the ripe pattern comes and goes without producing (see GFS op and the pinwheel retrograding  fish storm).

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33 minutes ago, Ralph Wiggum said:

Is he hugging the Euro op? Because the EPS aren't quite as intense looking as the op. Both GFS/Euro op are more blocky and better positioning but a little far out to be using the op as gospel. If the block is too far East that is one possible way the ripe pattern comes and goes without producing (see GFS op and the pinwheel retrograding  fish storm).

Not positive?

He posted on facebook late last night.

 
New developments about XMAS even rain to snow threat for eastern US AND strong indications or most favorable winter storm upper air pattern showing for Mid atlantic Ohio valley New England regions on DEC 29-30 and JAN 2-3 that I have seen since Jan 1996 H.E.C.S. Historic East coast snowstorm
 
 

 

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2 hours ago, Birds~69 said:

They're great just chillin out and walking around. They suck doing 65mph and dart in front of you. Nailed one on Rt 422 back in the 90s....scared the bejesus outta me!

26F

Agree and agree. Got a few flakes here but it looks to be sliding off to the ENE now. Radar looks interesting in South Jersey though.

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1 hour ago, Wentzadelphia said:

Yeah with this setup not happening. Gfs likes to put too much qpf in the cold sector with fronts like this. No way....

In other news still a bit of a signal for that post Xmas system. That’s 3 runs in a row on the gfs showing a deepening low off the EC

Agree on both points.

35F

* You may have to change your screen name to Hurtsadelphia soon...

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26 minutes ago, Animal said:

Mt Holly afd mentions possible table scraps with light snow overnight.

Thursday night and Friday we should see some snow...noted a plowable snow Friday poconos and nw nj.

May see a little something later tonight. Rain for the most part moving in now...temp here @  38F.

sc.jpg

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