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E PA/NJ/DE Winter 2024/25 Obs/Discussion


JTA66
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2 minutes ago, Newman said:

That GFS drops a solid 1"+ of QPF in some locations along I-95 in only 3 hours. That, at a minimum in such a dynamic storm, would drop like 15 inches or more of snow in only 3 hours

qpf_003h-imp.us_ma.thumb.png.587de15bb62c2cc8ec8bc8a297c5ee40.png

With a storm that intense and close to the coast, wouldn’t there  be mixing issues. I know it’s fantasy land but just saying.

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1 minute ago, Violentweatherfan said:

With a storm that intense and close to the coast, wouldn’t there  be mixing issues. I know it’s fantasy land but just saying.

Verbatim if we took the GFS as is, it actually reaches the latitude of about the DelMarVa and then gets kicked east. It's almost a perfect track for the Mid-Atlantic states. You can actually see a warm nose/WAA in Philly at 850mb, the flow off the Atlantic would certainly bring mixing issues into play for those over the coastal plain. But at this juncture it doesn't matter as you said, let's get the storm to solidify on models first.

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As of right now, I would lean still towards this being a Mid-Atlantic special as compared to an I-95 bomb up the coast to Boston. If there's no phase, well then we have no storm. If there is a phase, the decaying NAO block and 50/50 low should limit how north this got AND there appears to be a kicker wave on it's heels coming down the ridge over the west coast. Anything can happen, but just my early thoughts. We'll see lots of shifting around, probably some good and bad, in the coming days. I would be shocked if the current storm cyclogenesis process looks the same in 5 days

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47 minutes ago, Newman said:

That GFS drops a solid 1"+ of QPF in some locations along I-95 in only 3 hours. That, at a minimum in such a dynamic storm, would drop like 15 inches or more of snow in only 3 hours

qpf_003h-imp.us_ma.thumb.png.587de15bb62c2cc8ec8bc8a297c5ee40.png

Back in 1983, Allentown, at the height of the February blizzard, had two consecutive hours of 5"/hour snow rates. I've never seen it snow so hard in my life, before or after. Visibility was less than the worst pea soup fog. I'm guessing about 100 to 200 feet at best.

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44 minutes ago, Newman said:

Verbatim if we took the GFS as is, it actually reaches the latitude of about the DelMarVa and then gets kicked east. It's almost a perfect track for the Mid-Atlantic states. You can actually see a warm nose/WAA in Philly at 850mb, the flow off the Atlantic would certainly bring mixing issues into play for those over the coastal plain. But at this juncture it doesn't matter as you said, let's get the storm to solidify on models first.

Can you post that map with the warm nose

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54 minutes ago, Newman said:

That GFS drops a solid 1"+ of QPF in some locations along I-95 in only 3 hours. That, at a minimum in such a dynamic storm, would drop like 15 inches or more of snow in only 3 hours

qpf_003h-imp.us_ma.thumb.png.587de15bb62c2cc8ec8bc8a297c5ee40.png

15 inches in 3 hours would make my head explode... from there I would light myself on fire and jump out the window.

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20 minutes ago, Violentweatherfan said:

Can you post that map with the warm nose

I was just looking at the sounding at PHL around the height of the storm. You can see that warm nose at 850. The column is still below freezing verbatim, but in reality we all know how these things go if they're that tucked. 

gfs_2025010518_153_40.0--75_25.thumb.png.7c80dd42bdfaf5268e10c6cbce80ca46.png

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Just now, Newman said:

I was just looking at the sounding at PHL around the height of the storm. You can see that warm nose at 850. The column is still below freezing verbatim, but in reality we all know how these things go if they're that tucked. 

gfs_2025010518_153_40.0--75_25.thumb.png.7c80dd42bdfaf5268e10c6cbce80ca46.png

I was just thinking it should pull warm air off the ocean, but maybe not with temps BN

 

As always thanks 

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Well, I'm sort of with Neuman on this one ...also the reason I posted that silly YouTube meme earlier. This can only get so far North even with a full clean phase. Tomorrow is PRIME example.  The pattern isn't really changing much at all between tomorrow and the weekend. 50/50 locked in and displaced a bit too far SW thus confluence not in a prime spot for us. Sure it could change and shift. But with so much guidance (ens) in sync wrt those features, going to be a bit of a challenge. I'm also a believer in atmospheric memory.  And while we will continue to see snow this winter, have a gut feeling this will be a Mid Atlantic winter to remember. Hopefully they share a little, im not greedy.

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4 minutes ago, Ralph Wiggum said:

Pretty sure they Mid Atl is gearing up for an historic week. 1-2 punch i coming and this makes perfect sense given the high lat pattern

prateptype_cat-imp.us_ne.png

Heard the Canadian now has the storm. Should be a very interesting week of tracking. Yes the typical rollercoaster is likely, lol.

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7 minutes ago, mattinpa said:

Heard the Canadian now has the storm. Should be a very interesting week of tracking. Yes the typical rollercoaster is likely, lol.

Canadian mirrors the GFS. Not sure it will be able to get too far N  based on 500mb  before exiting stage right. There is a kicker right on it's heels on both models. That's a classic Mid Atl MECS look imo. But we will track.

gem_mslp_pcpn_frzn_neus_24.png

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2 minutes ago, LVblizzard said:

We need this thing to phase and deepen as early as possible with the kicker right on its heels. A more N-S ridge axis in the west would help too. Otherwise it grazes us and crushes the DMV area again.

Hopefully we get more accumulating snows. I'm not greedy on how much. 

Ens means all look to relax and reload for a bit after that threat. Might need to be really patient.

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