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


wdrag
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2 hours ago, coastalplainsnowman said:

Exactly.  From that pic it looks to me like that thing is going to hit even further southeast of the benchmark than this Thursday's "storm."  I think we'll be fine.  

Those things have caused megatsunamis in the past, read about how Chesapeake Bay was formed....

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45 minutes ago, RU848789 said:

That graphic makes it look like the asteroid is the size of Saudi Arabia, lol - it's actually 177 feet across.  Not sure if Bruce Willis or Robert Duvall will still be around to save us...

From the assessments this looks to be a Tunguska sized event, so not an ELE but it can be pretty dangerous if it hits a populated area.

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What I think of as a  2-6 hour snow event between 3PM and 11P in much of the NYCsubofrum, which is gradually becoming accepted in bits and pieces by Global ops (not specialized in smaller scale), but not yet accepted by the Ensembles; should be related to considerable 850 MB vorticity in the inverted trough back from the ocean low, pretty deep FGEN 850-700MB between I80 and I84 with the saturated layer interestingly enough south of the FGEN region.  There will be seeding from cirrus aloft, and a deep layer of moisture with the DGZ almost down 875MB.  

I can even see minor ocean effect on northerly flow off LI sound on the east end. 

So if there is sunshine, it's only Thursday morning.

This is a deepening 500MB low now starting in the northern Plains and modeled to have a nearly 200M 12 HR 5H HFC crossing the Delmarva Thu aft.  Closed lows aloft spell trouble... its not yet connecting directly to the ocean, probably cant capture it  because its too progressive but there is some westward room for development at 850MB. 

We'll see what happens, if anything. 

 

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34 minutes ago, wdrag said:

What I think of as a  2-6 hour snow event between 3PM and 11P in much of the NYCsubofrum, which is gradually becoming accepted in bits and pieces by Global ops (not specialized in smaller scale), but not yet accepted by the Ensembles; should be related to considerable 850 MB vorticity in the inverted trough back from the ocean low, pretty deep FGEN 850-700MB between I80 and I84 with the saturated layer interestingly enough south of the FGEN region.  There will be seeding from cirrus aloft, and a deep layer of moisture with the DGZ almost down 875MB.  

I can even see minor ocean effect on northerly flow off LI sound on the east end. 

So if there is sunshine, it's only Thursday morning.

This is a deepening 500MB low now starting in the northern Plains and modeled to have a nearly 200M 12 HR 5H HFC crossing the Delmarva Thu aft.  Closed lows aloft spell trouble... its not yet connecting directly to the ocean, probably cant capture it  because its too progressive but there is some westward room for development at 850MB. 

We'll see what happens, if anything. 

 

If you end up being right about the ULL-IVT driven minor snowfall all along, we'll all owe you big hugs!  Salvaging an inch of powder out of this debacle would still be very nice.  

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Similar to 18Z for inland areas, but a lot more snow for SENJ and far ELI. Just need the ULL to connect more to the low via an IVT to get those 1-2" amounts in NEPA to make it through NJ/NYC. I would guess we'll see a lot of movement in those ULL blobs/bands of snow NW of the NJ coast and ELI.  Congratulations Cape May and Montauk, lol.

snku_acc-imp.us_state_ne_s.png

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6 minutes ago, RU848789 said:

Similar to 18Z for inland areas, but a lot more snow for SENJ and far ELI. Just need the ULL to connect more to the low via an IVT to get those 1-2" amounts in NEPA to make it through NJ/NYC. I would guess we'll see a lot of movement in those ULL blobs/bands of snow NW of the NJ coast and ELI.  Congratulations Cape May and Montauk, lol.

snku_acc-imp.us_state_ne_s.png

Man if this verified that’s brutal. 100 miles more west for that grazer special 

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51 minutes ago, WestBabylonWeather said:

Man if this verified that’s brutal. 100 miles more west for that grazer special 

If that were to keep backing in like that we could end up with one of those surprise Montauk specials like in March 1998 (or was it 1999, I always forget), where they got 14", Riverhead maybe 6", flurries at the Nassau/Suffolk border, and Sam Champion showing mostly sunny skies from atop the Empire State Building.  Not saying that's happening, but something like that did happen once.

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6 minutes ago, coastalplainsnowman said:

If that were to keep backing in like that we could end up with one of those surprise Montauk specials like in March 1998 (or was it 1999, I always forget), where they got 14", Riverhead maybe 6", flurries at the Nassau/Suffolk border, and Sam Champion showing mostly sunny skies from atop the Empire State Building.  Not saying that's happening, but something like that did happen once.

I remember that well, unfortunately. I got the flurries in western Suffolk while the east end got buried 

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1 hour ago, psv88 said:

I remember that well, unfortunately. I got the flurries in western Suffolk while the east end got buried 

Yes, I remember this quite well. I lived in Ridge at the time. 1999. We got nearly a foot and it was snowing really hard for a while there. 

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My expectation for NYC-Long Island-northeast PA, northwest NJ and se NYS Thursday:  A period or two of powdery light snow or flurries between Noon and midnight that may slow the Thursday evening commute. Amounts generally under 1 inch but isolated 2" amounts possible in the Poconos and also eastern Long Island. If it does snow steady for 2-6 hours, then road treatments will be necessary. Uncertainty on amounts as most modeling is a slight dusting but the unusual recent and unfolding winter situation may produce somewhat more than a dusting.   I've provided my explanations yesterday. If the NAM and RGEM fade on the 500MB low, then I'm wrong on placing so much value on the developing closed low aloft and weak IVT. So while the big storm is far to the southeast....as others have noted, worth monitoring the mesoscale developments for tomorrow.  

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7 hours ago, USCG RS said:

Keep an eye on this. We are still 36 or so hours away and SR models want to back this coastal in. This is not a system to sleep on. 

The IVT feature is the only one I’m really concerned about, the coastal low snow is 100+ miles away. And it’s hard to pin down and even the NAM doesn’t show being particularly heavy. Maybe someone lucky ends up with 2”. Otherwise it’s coatings to an inch. 

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