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


wdrag
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Just wanted to memorialize the complete modeling failure for the Euro, GFS, CMC and UK models from 12Z Saturday to 0Z Monday, from major/historic snowstorm to essentially nada (need 2 posts for this due to size issues).  I don't recall a faster implosion in the last 15-20 years, as the axis of heaviest snowfall shifted 150-250 miles over 36 hours in this case. 

Even Jan-2015 went from a forecast of 18-24" for most in NJ (and there was not model consensus on the high snowfall forecasts 12-24 hours before that event) to several inches for most of NJ, which is at least not a complete miss (and yes I know this one isn't 100% over yet, but it's close).  March 2001 might be worse at least for me, as we had a forecast of 1-2 feet and got maybe 1" in CNJ. 

The only saving grace, kind of, is that it happened between 4 and 3 days out, which is a little less painful to me than having an actual forecast for a big storm and getting shut out.  

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3 minutes ago, rgwp96 said:

Only thing I can say positive is my snow cover survived the rain lol. Still solid 2-3 inches 

We still have 1/2" to 1" on our lawn.  That 0.6" of QPF that squeezed into 1.5" of snow/sleet/slush last Saturday and became a 1.5" dense concrete ice pack has had staying power, moreso than the 3.1" of snow that fell on top of it this past week. 

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Most of the mid Atlantic forum getting shut out of this now. Everyone said they were a lock no matter what. Nothings a lock. Time to move on. 

29.6 YTD doubt I get to 50 which is my seasonal norm but despite the lack of the big one the winters still a C+. At least it's looked and felt like winter. Much better than the last two sorry excuses for winter. 

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No change in original thread thinking from P1: I see the "put it to bed" commentary... so you need not check back.  

Upper air system looks too strong with a closed low developing to have this system miss us. I've added the BOM and WPC ensemble guidances.  I'm still in for 2-6" of powder from 0.1 to 0.4 liquid northwest to southeast across the NYC subforum.  It's possible that I'm wrong but pattern recognition of the unfolding eastward translation and intensification of the modeled low pressure system aloft argues for maintaining consideration of a snow event, even if the primary goes out a little far.  There could be some sort of inverted trough back to the coming upper low.  

BOM may come down in the next cycle or two due to missing some of the 06z/17 guidance but very hard for me to see a miss with the projected closed 5H low across PA-NJ. 

 

Screen Shot 2025-02-17 at 5.36.16 AM.png

Screen Shot 2025-02-17 at 5.37.32 AM.png

Screen Shot 2025-02-17 at 5.45.11 AM.png

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Just wanted to call out that if this does end up in the 2-6 inch range that wdrag is suggesting, then this is going to be an epically good forecasting job by him.  He didn't get sucked in when all models were showing 12-36 inches, and he hasn't moved his forecast now that they're all showing the storm completely missing us.  I'm not sure there's ANYONE else who falls into both of those groups.  If he's right, it would also suggest to me that there's a long way to go in improving the models, and that maybe deterministic, physics-based models which try to forecast what WILL happen instead of a range of probabilities just aren't the right approach for medium-range forecasting.

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Meanwhile, from the New York Post, 10 minutes ago: "Biggest snowstorm this season likely as nor’easter set to pummeled Northeast this week"

The article itself equivocates a bit, but that headline does not.  And "pummeled" - past tense - is in the actual headline, not a typo by me.

https://nypost.com/2025/02/17/us-news/could-northeast-get-pummeled-by-noreaster-this-week/?utm_campaign=nypost&utm_source=twitter&utm_medium=social

 

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4 minutes ago, coastalplainsnowman said:

Meanwhile, from the New York Post, 10 minutes ago: "Biggest snowstorm this season likely as nor’easter set to pummeled Northeast this week"

The article itself equivocates a bit, but that headline does not.  And "pummeled" - past tense - is in the actual headline, not a typo by me.

https://nypost.com/2025/02/17/us-news/could-northeast-get-pummeled-by-noreaster-this-week/?utm_campaign=nypost&utm_source=twitter&utm_medium=social

 

LOL I saw that yesterday ''Buckle-up''

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1 hour ago, wdrag said:

No change in original thread thinking from P1: I see the "put it to bed" commentary... so you need not check back.  

Upper air system looks too strong with a closed low developing to have this system miss us. I've added the BOM and WPC ensemble guidances.  I'm still in for 2-6" of powder from 0.1 to 0.4 liquid northwest to southeast across the NYC subforum.  It's possible that I'm wrong but pattern recognition of the unfolding eastward translation and intensification of the modeled low pressure system aloft argues for maintaining consideration of a snow event, even if the primary goes out a little far.  There could be some sort of inverted trough back to the coming upper low.  

BOM may come down in the next cycle or two due to missing some of the 06z/17 guidance but very hard for me to see a miss with the projected closed 5H low across PA-NJ. 

 

Screen Shot 2025-02-17 at 5.36.16 AM.png

Screen Shot 2025-02-17 at 5.37.32 AM.png

Screen Shot 2025-02-17 at 5.45.11 AM.png

Interesting how the top map has us for 30% chance of 1 inch of snow and the bottom map says it's going to be 4.0-4.4 inches of snow.

I'd bet a significant amount that Central Park will NOT get 4 inches of snow.

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3 hours ago, CPcantmeasuresnow said:

Most of the mid Atlantic forum getting shut out of this now. Everyone said they were a lock no matter what. Nothings a lock. Time to move on. 

29.6 YTD doubt I get to 50 which is my seasonal norm but despite the lack of the big one the winters still a C+. At least it's looked and felt like winter. Much better than the last two sorry excuses for winter. 

Philly only has 50% of their normal snowfall this winter, I wonder if they should no longer be included in the Mid Atlantic? This has really been a below the Mason Dixon line winter.

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6 hours ago, RU848789 said:

Just wanted to memorialize the complete modeling failure for the Euro, GFS, CMC and UK models from 12Z Saturday to 0Z Monday, from major/historic snowstorm to essentially nada (need 2 posts for this due to size issues).  I don't recall a faster implosion in the last 15-20 years, as the axis of heaviest snowfall shifted 150-250 miles over 36 hours in this case. 

Even Jan-2015 went from a forecast of 18-24" for most in NJ (and there was not model consensus on the high snowfall forecasts 12-24 hours before that event) to several inches for most of NJ, which is at least not a complete miss (and yes I know this one isn't 100% over yet, but it's close).  March 2001 might be worse at least for me, as we had a forecast of 1-2 feet and got maybe 1" in CNJ. 

The only saving grace, kind of, is that it happened between 4 and 3 days out, which is a little less painful to me than having an actual forecast for a big storm and getting shut out.  

image.gif.e0d3a4b8907421a859369edd791c39c1.gif

image.gif.3c11734683ed7abc696e20737cb6ee84.gif

One more bust that no one really talks about is the January 2008 Heavy Snow Warning bust.... remember that one lol?

 

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46 minutes ago, NJwx85 said:

Who are you and why are you using my name?

Sorry I am not an imposter or trying to offend you but when you changed your display name for whatever reason, I assumed the name would be available once again. Being a diehard Yankees fan all my life, and trying to get out of this damn snow drought for the past 3 years that we’ve been in I figured that could change our luck. All I succeeded in doing was making our big storm this week go OTS and piss you off.:(

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29 minutes ago, LibertyBell said:

Interesting how the top map has us for 30% chance of 1 inch of snow and the bottom map says it's going to be 4.0-4.4 inches of snow.

I'd bet a significant amount that Central Park will NOT get 4 inches of snow.

The top map if you read the ending time is 7AM Thursday, the next one should say 24 hours ending 7AM Friday.

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1 minute ago, Snowguy66 said:

Walt may be correct and if so, then that is forecasting and not model hugging


.

I am certain of a period of light snow Thursday.. NAEFS support and soooo much room for development at 850MB off VA as the upper low slowly becomes neutral.in its end approach to PA  We're 4 days out.  

I am one to make an initial call... and stay with it.  WHAT IF THIS COMES BACK AND how does the NWS explain.

Once the cat is out of the barn so to speak, you stay with it, til it goes away, at least for decision makers. 

That I why the NWS is very conservative eve beyond 60 hours.  

Here in AMWX most are looking at models and wind shield wiping with every sweep and you can do that, with no impact except on the board. 

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