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


wdrag
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4 minutes ago, Krs4Lfe said:

This is what happens when we do modelology instead of meteorology. we can post all these pretty maps of good pattern depictions and of storms that deep down we know won’t come to fruition because the base state of the winter and the upper level patterns and do not support it, but we all want clicks and we all want to look at something that looks nice while abandoning all reasoning about while this winter has performed poorly at least in the snow department for our sub forum. and why it will continue to do so because the background state has not changed and we are looking at quick pattern regression in late month and early March after the storm threat passes. Pretty model depictions and depictions of storms aren’t gonna cut it. That is modelology not meteorology and that’s all we’ve been doing since 2022

You joined in 2024. Maybe leave 2022 and 2023 with the previous sock. 

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4 minutes ago, Krs4Lfe said:

This is what happens when we do modelology instead of meteorology. we can post all these pretty maps of good pattern depictions and of storms that deep down we know won’t come to fruition because the base state of the winter and the upper level patterns and do not support it, but we all want clicks and we all want to look at something that looks nice while abandoning all reasoning about while this winter has performed poorly at least in the snow department for our sub forum. and why it will continue to do so because the background state has not changed and we are looking at quick pattern regression in late month and early March after the storm threat passes. Pretty model depictions and depictions of storms aren’t gonna cut it. That is modelology not meteorology and that’s all we’ve been doing since 2022

the upper air pattern absolutely supported a large storm. that's what's so brutal about it. the "background state" stuff is bordering on pseudoscience. nobody can even truly explain what they mean when they say it

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10 minutes ago, RCNYILWX said:

Maybe someone more intricately involved in NWP can chime in, but my perception from my NWS career (started in Feb 09 at OKX) and my hobbyist phase going back years before that, is that modeling has grown less stable at closer in lead times on the most important details for system evolution. I think that global modeling systems are better than they've ever been at nailing the large scale pattern at long leads, but these large swings inside D5 feel more common to me than back in the 2000s and 2010s.

My theory is that it's partially related to faster flow due to CC and partially related to ever increasing resolution (high resolution garbage in still = high resolution garbage out; ie. errors in those high res details, such as convective parameterizations, reach many of the members which all have the same physics and then amplify). I have no idea if I'm right on this, but I'm def interested in hearing from others better versed than me.

Sent from my Pixel 9 Pro using Tapatalk
 

Interesting points.  Wouldn't that be where hindcast analysis for some past storms comparing the "old" models to the "new and improved" ones would be helpful and possibly indicate that for major storms, where stability is pretty damn important, perhaps some work needs to be done to improve the models?  Who gives a crap about predicting the heights at 500 mbar and SLP on sunny days (which is what most of the verification scores are based on, iirc; although I do know more detailed storm verification scores are kept on hurricanes)?  I don't care if it's 73F vs. 80F for a high, but I do care about whether I'm going to get 1" or 6" of snow in 2-3 days. 

I do also wonder how much the AI models have been "trained" on datasets like what we've seen over the past few days (although there probably aren't too many of them).  

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Sarcasm aside, the energy for Thursday is  still 3000 miles away, not even ashore in the PNW yet. No balloon sampling data from that to inject into the models. We should see some of that data coming in with the 12z or 18z runs tomorrow.

We have a long way to go. Not gonna know where this goes until about 48 hours lead time. 

 

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7 minutes ago, nycsnow said:

It’s over. Enjoy the long weekend, hopefully we start seeing models hop on some warmer weather. Only saving grace is we still have til Tom until it’s all sampled 

Was it over when the Germans bombed Pearl harbor?!?!

 

Joking aside, you kind of ruined your argument within your own statement.  Sampling isn't nearly done.  No cliff jumping yet.  

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3 minutes ago, coastalplainsnowman said:

I'm noticing Friday the 21st dates on a number of the recently posted maps.  Is there consensus (whether it scrapes by or hits more directly, is weaker or is stronger, etc.)  that anything that were to happen would start more like Thursday night rather than overnight Wednesday into Thursday?

No it's gone by Thursday evening

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25 minutes ago, coastalplainsnowman said:

I'm noticing Friday the 21st dates on a number of the recently posted maps.  Is there consensus (whether it scrapes by or hits more directly, is weaker or is stronger, etc.)  that anything that were to happen would start more like Thursday night rather than overnight Wednesday into Thursday?

NO consensus... it has to start here by 12z Thu. 

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Of course I worry but we're 96-108 hours out... we are modeled to be grazed and that's kind what the thread P!- headline tried to caution.  

I dont expect a big one here, but I continue 2-6" for the NYC subforum. Maybe I'm too high, but I think being steady with the original perception and cautions is working.

Maybe WPC is too strong too? per it's attached 16z/16 issuance for D5 Thursday, using the legend color bar probs for 3" or more of snow.  

I'll throw in the towel tomorrow afternoon if all the 12z-18z/17 ensembles are less than 1" NYC.  High pressure WAYYYY out west and room to edge north.   

Enjoy what you can in life... 

Screen Shot 2025-02-16 at 1.25.19 PM.png

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