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


wdrag
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Thread started due to 3 successive cycles of the EPS/GEFS/CMCE showing 1+" in 24 hours and amounts increasing through the most recent 00z/14 cycle.  

Will this be relatively benign snowfall only raising our monthly total close to normal, or could it be our first 6+ Central Park event since late Jan 2022?

Whatever happens, it looks like powder (presuming it snows an inch or more in CP), with some gusty north-northeast winds.

Graphics: 00z/14 cycle WPC D7 and GEFS,CMCDE, EPS 24 hour (10 to 1 ratio) amounts with various ending times late Thu the 20th or early Friday the 21st.

Reminder: These ensemble snowfall axis  can be in error by over 100 miles on a D6-7 forecast so the modeling provided is not a lock where currently placed. 

7PM 2/17/25: adjusted headline to narrow the timing goal post of what has become a much more uncertain event since initially proposed...even with the option of no snow. This despite a strong short wave passage Thursday evening.  The GEFS still closes a low through PA while the EPS has weakened to an open - less ominous progressive short wave trough with no significant 850 MB onshore circulation.  The 15z/17 SREF, 18z/17 NAM and 12z/17 JMA are the only models with any significant hope for snow as the globals have largely faded southeast since thread inception.   The apparently lagged average BOM and 12z/17 WPC still maintain an opportunity for a period of light snow (1/2-4" nw to se on the BOM). 

Screen Shot 2025-02-14 at 12.23.23 AM.png

Screen Shot 2025-02-14 at 1.46.54 AM.png

Screen Shot 2025-02-14 at 2.07.37 AM.png

Screen Shot 2025-02-14 at 1.45.39 AM.png

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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

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5 minutes ago, 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

Outside of 5 days it has been just as jumpy as othy. An whiffed terribly with the DC storm the other day

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This is one time when a stronger transient Southeast Ridge can work to our advantage and help to lessen the influence of the faster Pacific Jet and shortwave coming into the West Coast. It’s definitely a fragile set up where small changes can cause a shift. But at least at this early stage represents the best chance this winter for a heavier snowfall event.

New run slightly stronger transient Southeast Ridge and closer EPS mean to the coast

IMG_3039.thumb.png.111cbee7bd3b7ea9fcc362c12d6252d8.png

 

Old run a little weaker with more suppressed storm track

IMG_3041.thumb.png.7edd0fd9c9002743a4dca6753af5bb34.png

 

 

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3 minutes ago, Dark Star said:

I don't know, would I take a guaranteed 4" snow fall from this system, or trade it for a future bigger possibility?  I think I would trade it for what's behind the curtain...

I'm not sure thats a real possibility though, this is either a big hit or a miss.  I don't really see a scenario here where its like a 2-4 inch storm

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1 minute ago, MJO812 said:

Cmc is insane

I would favor the CMC as of right now because the GFS OP was a complete miss too drastic a change in a few hours and its the worst performing model of the bunch - see if the GEFS agrees

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15 minutes ago, Dark Star said:

I don't know, would I take a guaranteed 4" snow fall from this system, or trade it for a future bigger possibility?  I think I would trade it for what's behind the curtain...

I want the box Monty, the box!
But in all seriousness, I think we need to get thru the system for this weekend, see how things shake out in the atmosphere after that to see how serious this system will be. A significant snow fall or a huge snow event. We haven't had a big snow event in the NYC/LI area in what 3 years?

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