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3/17-3/18 Storm Threat Discussion


Zelocita Weather

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The 00z ECMWF Ens indies are really hit or miss. There really is no medium here at all. Either you eject all the energy and wind up with a big storm (monster in some cases), or you hold it back and a weak wave of snow spreads over the MA. 

 

I can't say I've ever seen energy being held back the way the OP GFS and the ECMWF have been holding it back though. 

I kind of think that's how it will be as well, either a weak storm that doesn't do much for anybody or a wrapped up storm that delivers lots of precip but a lot of it could be a mix because of how warm the mid levels could get.

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I'd rather take my chances with a strong low, heavy front end snow and if I end as sleet that's fine by me.

 

Me too. The NAM has taint at the end but the lift which comes through on the front end is really impressive and would result in a dynamic heavy snow for everybody here. The snow depth maps (more accurate than the weeniebell maps) show 12+" for anybody north of Trenton followed by some sleet. 

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I kind of think that's how it will be as well, either a weak storm that doesn't do much for anybody or a wrapped up storm that delivers lots of precip but a lot of it could be a mix because of how warm the mid levels could get.

The past couple wrapped up LP systems have had that pesky warm punch at 900-925mb that took sometimes a good bit to overcome. Fine wire we're walking on the coast regardless if its DJF or march
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Me too. The NAM has taint at the end but the lift which comes through on the front end is really impressive and would result in a dynamic heavy snow for everybody here. The snow depth maps (more accurate than the weeniebell maps) show 12+" for anybody north of Trenton followed by some sleet. 

Agreed, if you look at the low res simulated radar it even shows most of NJ in a dry slot at hour 87 with more precip still hung back all the way to Pittsburgh.

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The past couple wrapped up LP systems have had that pesky warm punch at 900-925mb that took sometimes a good bit to overcome. Fine wire we're walking on the coast regardless if its DJF or march

Ask Lord Earthlight, he even had sleet mix in during PDII and that was about as cold an air mass as you will ever have.

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Ask Lord Earthlight, he even had sleet mix in during PDII and that was about as cold an air mass as you will ever have.

Great idea the holy one would know. Its incredible though even during BDB we saw some mixing around 925 and that was as close as we'll get to a true arctic blizzard

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I was living in Brooklyn then but, yeah.

I know, that was my point. (Since a lot of posters here live closer to Brooklyn than say Sussex)

 

People that live on or near the immediate coast should accept that mixing issues are not necessarily guaranteed but always a likely possibility with a SWFE.

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I'll point this out before the NAM run, IMO one of the reasons we get a far NW solution on the NAM;

 

Basically the GFS/EURO have more energy on the wave that dives down around New Mexico, while the NAM kind of focuses on the wave that dives through Montana etc. 

 

More energy on the backside of the trough kind of forces the energy to dig farther SW, so less is eventually ejected.

 

In the sickness that is my weather addiction I've analyzed every hour of every model run and to me this is one of the features that stood out onto why some models are more north than others.  

 

GFS:

42gfs.gif
 
NAM:
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Based on my theory a few posts back on why the NAM is really far north, it seems so far it has corrected itself with the energy coming on shore from the NW. It is farther SW with this energy a bit...Doesn't mean it won't be a good run, but if my theory is right it'll probably correct itself south a bit here. 

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Based on my theory a few posts back on why the NAM is really far north, it seems so far it has corrected itself with the energy coming on shore from the NW. It is farther SW with this energy a bit...Doesn't mean it won't be a good run, but if my theory is right it'll probably correct itself south a bit here. 

I'm not really seeing what you're talking about, by hour 18 the NAM has the northern energy in Montana. If it's further west it's not by a lot. Also looking at H5, the northern vort is stronger this run. That's probably going to bring a quicker phase.

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