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


TriPol
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1 minute ago, EastonSN+ said:

So the 12k flipped to sleet quicker but the sleet line did not get as far north which is a step in the right direction. We need 1 more tick like that.

We need the snow shield to be heavier/steadier. In 3 hours that NAM run surged the sleet line from Wilmington DE to Staten Island. The heavy precip is when it's sleeting. It would be varying snow rates for a few hours then all out sleetstorm for 60-70% of the precip that falls. 

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2 minutes ago, Winterweatherlover said:

I'm not buying freezing rain vs snow, theres going to be a lot of sleet in between. 

Almost all of the guidance, including the NAM have the 875 mb layer down to the surface well below freezing. That would produce sleet. Some freezing drizzle can't be ruled out at some point, but the steady precipitation following the changeover from snow should be sleet.

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4 minutes ago, jm1220 said:

They weren't better. People forget the massive shift within 48 hrs for the 12/26/10 blizzard for example. I thought that one was lost OTS.

But didn't the euro keep it? One model kept it.. they were still better back then..

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Just now, SACRUS said:

 The soon to replace NAM (q2?)  RRFS - Rapid Refresh Forecast System

1/24 00z

 

qpf_acc-imp.us_ma.png

 

sn10_acc-imp.us_ma.png

That includes sleet. The WB maps show a disastrous outcome with sleet getting well north of I-80 and just 6” for the city.

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Haven’t had a chance to read the forums today but have stayed with the model runs; any thoughts on why the NWS maps are so aggressive? Well south of me in Toms River is still coded 10-15, and that just doesn’t seem likely based on the majority of guidance. Are they weighing the GFS more because it seemed to hold to a snowier outcome? 
 

Just being cautious? This is a tough one thing to pin down exact mix lines / lanes, any wiggle could shift totals - so logically surmising they’re just playing safe? Just seems awfully aggressive. 

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2 minutes ago, donsutherland1 said:

And the GFS was first to bring it back. For a time, it was the only model showing a big storm, but its solutions were dismissed on grounds that they were the result of initialization errors.

Yea I remember one model still had it... Lol

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1 minute ago, psv88 said:

The NAM is totally out on its own. The other models are trending colder and snowier. 

Seems they are mostly holding steady as opposed to trending any particular way. Either way yes the NAM seems to be the outlier now, although if it's the outlier 24 hours from now I'd take it more seriously.

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