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Extreme Cold, Snow & Sleet: SECS 1/24 - 1/26


TriPol
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1 minute ago, MANDA said:

I"m going to need to see some support from the 00Z CMC RDPS / HRDPS before I give much weight to this.  If it is onto something both the RDPS and HRDPS should start to see it.

 

They were there @ 18z 

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1 minute ago, Snowlover11 said:

Nam is unchanged from its 18z run

 

1 minute ago, Winterweatherlover said:

NAM doesn't seem to be backing down, if anything maybe a touch warmer than 18z.

Its actually slightly south with the sleet. Coastal is east.

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Just now, Winterweatherlover said:

NAM doesn't seem to be backing down, if anything maybe a touch warmer than 18z.

At this point the NAM is probably overdone a little with the warmth but it has something of a clue. I believe it more than the cold HRRR/RAP that I’ve seen come in too cold in SWFE setups. 

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Just now, jm1220 said:

At this point the NAM is probably overdone a little with the warmth but it has something of a clue. I believe it more than the cold HRRR/RAP that I’ve seen come in too cold in SWFE setups. 

Nam 3k don’t even agree it’s a bit colder and snowier Nam is literally on its owns there’s gonna be a point where people stop giving it so much credit. Nothing is trending to it 

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Just now, Winterweatherlover said:

NAM is way different than the other models in terms of the snow amounts in southern Ohio and southern PA. We'll probably know by tomorrow morning if the NAM is onto something or lost.

From Little Rock to Carolina’s NAM has been off all day

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2 minutes ago, Winterweatherlover said:

NAM is way different than the other models in terms of the snow amounts in southern Ohio and southern PA. We'll probably know by tomorrow morning if the NAM is onto something or lost.

We’ll know in the morning as the snow shield comes into the area. We need the hellacious thump the RGEM models and HRRR/RAP show. 

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1 minute ago, jm1220 said:

We’ll know in the morning as the snow shield comes into the area. We need the hellacious thump the RGEM models and HRRR/RAP show. 

The RGEM showing the big thump gives me some hope, and the UKIE as well. I can't much if any stock into what the HRRR and RAP show, they almost always run on the cold side.

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2 minutes ago, SACRUS said:

 

1/26 00z NAM

 

QPF storm

qpf_acc-imp.us_ne.png

 

Snow:

sn10_acc-imp.us_ne.png

Well, if there’s 5” of snow at 10-1 ratio (0.5” liquid) then 1” liquid as sleet, that’s 8” total with sleet at 3:1 ratio. And again I don’t think this is gospel correct but it’s been consistent enough today to think it has to be onto something since it’s usually a little better at finding these warm layers, although it often overdoes it somewhat. 

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2 minutes ago, MJO812 said:

You dont know that. People bash the Nam all the time and now its right ?

it certainly led the way detecting the warm nose from its 84 hour run...there is pretty good agreement now that south of 78 will have a changeover to sleet...the question is does it get all the way up the ny/nj border. The high end amount for this storm have all been sliced little by little. The HRRR is always cold and snowier than reality. Im not saying it might only be 4-6, i am saying the warming alot is real. That will prevent those 10-12 inch amounts in central jersey and Nyc and jersey shore

im expecting a heavy thump for about 5 hours from 8-1pm and then sleet and then shuts down to snizzle....5-6 inches with an inch of sleet. maybe 6-8 a call for my area

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2 minutes ago, jm1220 said:

Well, if there’s 5” of snow at 10-1 ratio (0.5” liquid) then 1” liquid as sleet, that’s 8” total with sleet at 3:1 ratio. And again I don’t think this is gospel correct but it’s been consistent enough today to think it has to be onto something since it’s usually a little better at finding these warm layers, although it often overdoes it somewhat. 

But what about every other model that’s been locked in for days? You could make the argument for cmc rgem Ukie rap hrrr euro ai euro they haven’t wavered 

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