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February 19-20 Major Winter Storm Threat


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1 minute ago, Durmite said:

I appreciate following everyone's awesome work and learning as I go. I feel fairly inadequate asking anything, but is there and idea of what time this stuff will start in the triangle? I'm trying to make sure my staff isn't on the roads. Thank you!

Looks like it will start by late morning. Probably best to just stay home and not have them come in at all. I say that because that is how we get people stranded even with minor snow amounts (snowpacalypse). That happens when everyone goes in and gets early release around the same time.

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The 12K NAM sucks, I mean it stinks as a model.  But it does one thing exceptionally well: it sniffs out a warm nose like a freaking terminator.  Based on this and based on the long-joked-about-but-still accurate-maxim, "trust the least snowy model" combined with the maxim that the warm-nose always overperforms: I "officially" predict that the 12K NAM will "win" and RDU south will have little or no snow.  I hope I bust horribly and I get a snowball to the face tomorrow.

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Meanwhile, 12Z UKMET at RDU dropped back from the  2.1” of the 0Z run, to 1.5” on the 6Z and to 1.4” on the 12Z. The qpf on the 12Z is ~0.13”.

 It looks like to me that just about all of the precip at RDU will be snow per general model consensus.

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3 minutes ago, cbmclean said:

The 12K NAM sucks, I mean it stinks as a model.  But it does one thing exceptionally well: it sniffs out a warm nose like a freaking terminator.  Based on this and based on the long-joked-about-but-still accurate-maxim, "trust the least snowy model" combined with the maxim that the warm-nose always overperforms: I "officially" predict that the 12K NAM will "win" and RDU south will have little or no snow.  I hope I bust horribly and I get a snowball to the face tomorrow.

2 inches of sleet would still be a "win"

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18 minutes ago, Brick Tamland said:

I think the sweet spot in NC is going to be from 95 down to 64 to 87 to 40 and then up 501.

The mix line is going to absolutely break hearts tomorrow especially if areas just north of it get enough moisture for a big snow. I could be tempted to up the triangle forecast to 2-4” (or even 3-5”) after seeing 12z guidance roll in if I was RAH but they have that mix in their back pocket to keep most of the area in the 1-3” range. If trends continue though I could see Wake upgraded simply bc all of those solutions, even the sleet, are highly impactful if the higher QPF is realized. And northern wake would probably hit warning criteria unless the 12z NAM warm nose isn’t on crack. I don’t think they have to blink until tomorrow morning though unless afternoon models keep increasing. It’s funny, the more QPF we get the trickier the forecast becomes bc the difference of totals in the mix vs non mix areas goes from like Tr-1/2” to 3” on one side or the other to 1/2-1” to 6-8”. The upper margin increases disproportionately 

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5 minutes ago, NorthHillsWx said:

The mix line is going to absolutely break hearts tomorrow especially if areas just north of it get enough moisture for a big snow. I could be tempted to up the triangle forecast to 2-4” (or even 3-5”) after seeing 12z guidance roll in if I was RAH but they have that mix in their back pocket to keep most of the area in the 1-3” range. If trends continue though I could see Wake upgraded simply bc all of those solutions, even the sleet, are highly impactful if the higher QPF is realized. And northern wake would probably hit warning criteria unless the 12z warm nose isn’t on crack. I don’t think they have to blink until tomorrow morning though unless afternoon models keep increasing. It’s funny, the more QPF we get the trickier the forecast becomes bc the difference of totals in the mix vs non mix areas for from like Tr-1/2” to 3” on one side or the other to 1/2-1” to 6-8”. The upper margin increases disproportionately 

I still don’t see much if any mixing of non-snow precip in the RDU area. This looks like a classic practically all snow Miller A there imo (maybe just a little sleet). 850s look to stay safely <0C from what I’ve been seeing. You may even get a little higher than 10:1 ratios of snow.

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2 minutes ago, GaWx said:

I still don’t see much if any mixing of non-snow precip in the RDU area. This looks like a classic practically all snow Miller A there imo. 850s look to stay safely <0C from what I’ve been seeing. You may even get a little higher than 10:1 ratios of snow.

The NAM looks like lots of mixing but maybe I'm not looking at the latest one. 

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2 minutes ago, GaWx said:

I still don’t see much if any mixing of non-snow precip in the RDU area. This looks like a classic practically all snow Miller A there imo. 850s look to stay safely <0C from what I’ve been seeing. You may even get a little higher than 10:1 ratios of snow.

You didn’t just watch the noon news on WRAL and it shows :lol:

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