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Discussion-OBS snow event sometime between 06z Thu 2/20-12z Fri 2/21?


wdrag
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2 minutes ago, LibertyBell said:

they weren't so happy about it in 09-10

I'm sure you remember the snowicane in late February when NYC and you both got over 20 inches and they got zilch lol.

My biggest storm ever here 35 inches, Danbury CT 30 miles due east of me I think ended up with about 10 inches becuase of all the rain they started with.

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3 minutes ago, CPcantmeasuresnow said:

My biggest storm ever here 35 inches, Danbury CT 30 miles due east of me I think ended up with about 10 inches becuase of all the rain they started with.

That was the storm which really differentiated our area from New England.  I was thinking our area should be named interior northeast but that doesn't cover NYC and Long Island, so maybe it should just be called the tristate area.

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45 minutes ago, nycsnow said:

0z 

Image
 

sn10_acc-imp.us_ma.png
vs 12z

Image
 
sn10_acc-imp.us_ma.png

Full on NAM cave job. And the RGEM and ICON follow with zip zero now too. This was an absolutely horrifying bad, bad, bad performance from the NAM, ICON, CMC/GEPS, RGEM, UKMET and the EURO/EPS. The GFS/GEFS, GFS-GraphCast and EURO-AIFS schooled them. Completely embarrassing 

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I’m still not completely writing this off until 0z Wednesday at the latest. I have a hunch that will we see a shift back to the West with weaker confluence but just to note it’s not going to be anywhere close to that one day where all models showed feet. I’m basically taking Walt’s side on this one. If he’s still engaged then no reason why we can’t have some hope of a light to moderate snowfall 

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6 minutes ago, allgame830 said:

I’m still not completely writing this off until 0z Wednesday at the latest. I have a hunch that will we see a shift back to the West with weaker confluence but just to note it’s not going to be anywhere close to that one day where all models showed feet. I’m basically taking Walt’s side on this one. If he’s still engaged then no reason why we can’t have some hope of a light to moderate snowfall 

How did I figure @snowman19would throw a weenie. Basically you’re saying Walt is a weenie too! 

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14 minutes ago, allgame830 said:

I’m still not completely writing this off until 0z Wednesday at the latest. I have a hunch that will we see a shift back to the West with weaker confluence but just to note it’s not going to be anywhere close to that one day where all models showed feet. I’m basically taking Walt’s side on this one. If he’s still engaged then no reason why we can’t have some hope of a light to moderate snowfall 

Some models have a little bit of interaction with the PV and southern stream as our storm passes well to the east, causing light snow to break out over the area. I can’t really see more than an inch or two out of this even in the best case scenario though.

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4 minutes ago, nycsnow said:

Gfs has the highest snowfall area so small. This isn’t good for anyone outside the Carolina coast 

Because the flow isn't amplifying up the coast which would bring moisture with it. The kicker to the west knocks out the western ridge and there's also confluence north of us. So the trough remains a strung out zonal mess that gets booted out.

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1 hour ago, jm1220 said:

The overall setup looked like something that may produce but most also said it was something that could easily fall apart mostly because of the unfavorable Pacific. And gee whiz...

No one should be surprised we're left with more suppressed garbage.

It has more to do with a negative five standard deviation AO than the pack.

If we had a weaker AO and the same pack the storm would have gained latitude and we would have had a decent event. The fast pack would have hindered the epic slow moving bombs, however we would have had a good four to eight six to twelve event with the same pack and a week or AO.

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1 hour ago, TriPol said:

I just hate the fact that nearly every single model showed this... and then they didn't.

Agreed. At least January 2015 the nam and the euro showed us getting hammered however all the other models showed Eastern New England. So when it failed in our area it was really only two models that failed. Every single model including the AI at one point should it's getting hit. 

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54 minutes ago, snowman19 said:

Full on NAM cave job. And the RGEM and ICON follow with zip zero now too. This was an absolutely horrifying bad, bad, bad performance from the NAM, ICON, CMC/GEPS, RGEM, UKMET and the EURO/EPS. The GFS/GEFS, GFS-GraphCast and EURO-AIFS schooled them. Completely embarrassing 

EURO has never been the same model since being upgraded. Back in the day it would lock into an event 5 days out and never waver.

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14 minutes ago, EastonSN+ said:

Agreed. At least January 2015 the nam and the euro showed us getting hammered however all the other models showed Eastern New England. So when it failed in our area it was really only two models that failed. Every single model including the AI at one point should it's getting hit. 

That was still worse because the euro didn't back off until the day of and was still considered the king at that point. Imagine if the models were in agreement tomorrow and then backed off Wednesday? Would be total mayhem

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2 minutes ago, Stormlover74 said:

That was still worse because the euro didn't back off until the day of and was still considered the king at that point. Imagine if the models were in agreement tomorrow and then backed off Wednesday? Would be total mayhem

Yeah but at least there was a decent amount of doubt as all but two models showed Eastern New England getting the storm so It wasn't a total complete shock when it came in the last minute. Looking in retrospect we should have been going with all the other models as only two showed us in the bullseye. What made that one hard to swallow was the media and the national weather service going with the euro.

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Just now, EastonSN+ said:

Yeah but at least there was a decent amount of doubt as all but two models showed Eastern New England getting the storm so It wasn't a total complete shock when it came in the last minute. Looking in retrospect we should have been going with all the other models as only two showed us in the bullseye. What made that one hard to swallow was the media and the national weather service going with the euro.

Yeah I was always skeptical because of the complicated setup and lack of model support.  Plus the euro was making some ticks east the day before that people said was just noise

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Here's the 2.5 day trend of the NBM since Saturday at 12Z (every 12 hours), showing how the NBM can be very misleading in trending situations, due to its time-lagged nature.  I think everyone here knew this storm was mostly toast by yesterday at 12Z, but the NBM was still showing 6"+ for the 95 corridor with a bit less NW and up to 9" at the NJ coast.  And it just showed <3" for the 95 corridor at 12z today.  I think it's a useful tool when models aren't trending one way or another, significantly, but has been useless for this event.  

trend-nbm-2025021513-f137.snowfall_acc-i

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2 minutes ago, Northof78 said:

One out of 2 perfect tracks isn't bad...although probably would prefer a little cold air

Even with a cold air source that is inside the benchmark so Long Island coastal New Jersey and the City would likely be mostly rain. 

However could have been decent for inland areas although a fast mover.

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On 2/14/2025 at 9:40 AM, RU848789 said:

Obviously, the incredible consensus for a major to historic snowstorm from the 4 global Op models, as well as the unusually snowy ensemble means for these models, are fantastic to see, but we know there's no guarantees in this game.  Which is why the AIFS has me at least a bit worried, as it's been pretty good on tracks this winter...let's hope the AIFS is just wrong and comes back to a better track and wetter solution than the trend we've seen over the last 24 hours...

image.gif.450642100c49a55d5e3600444bc73e26.gif

In hindsight, it looks like the Euro-AI model scored a significant modeling coup, as it never showed a major (8" or more - my definition) snowstorm for our area, unlike almost every other global model all of which showed at least a few runs with major snowfall. The Euro-AI had most runs in days 4-7 showing a minor to moderate hit with one run on Sat 12Z with significant (4-8", again, my definition) snowfall, but not major. Out of the rest of the models, the GFS was close to the Euro-AI, only showing one major snowfall run, also on 12Z Sat. The Euro, UK and CMC all had multiple major snowfall runs for our region in that timeframe (including some historic runs).  So still a significant failure for the AIFS/GFS but an epic failure for the Euro/UK/CMC.  IMO. 

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