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February 19-20 Major Winter Storm Threat


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12 minutes ago, DC2Winston said:

First time I’ve seen a WSW paint such a broad range like this, 1-6 inches. 2-4, 3-6 yes of course. Tough forecast I know, but aren’t they all in the RAL footprint? :-)


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Maybe because they think it will be disruptive to travel since temps will be low for a lot of sticking, etc.  I thought it was weird too.

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2 hours ago, GaWx said:

RDU. There are no p-type maps or 2 meter temp maps for the JMA at either WB or TT. It is pretty much a given that 2m will be below 32. TT does have 850s at 24 hour intervals for today’s 12Z JMA allowing me to educatedly guess that RDU would be just about all snow (maybe a little sleet). I think that 6” of snowfall from 0.80” qpf would be doable but it is just an educated guess. Regardless, it would be a major hit. If it were mainly sleet (highly doubtful), it would still approach 3” of concrete.

***Edit: I’ll update this when it comes out on WB as they have 850s and qpf at 6 hour intervals through hour 72.

I just saw WB 12Z JMA update: the 850s do, indeed, stay just <0C at RDU through the entire event and qpf is 0.80”. Based on this, I’m going to retain my educated guess that this is giving RDU ~~6” of mainly wet snow with perhaps a small amount of sleet:

12Z JMA furthest N 850 0C line southern border of Wake county with -1C at RDU:

IMG_3087.thumb.png.d24010c79b81fc0e42d7b7ec82069c0e.png

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Just now, GaWx said:

I just saw WB 12Z JMA update: the 850s due, indeed, stay just <0C through the entire event and qpf is 0.80”. Based on this, I’m going to retain my educated guess that this is giving RDU ~~6” of mainly wet snow with perhaps a small amount of sleet:

12Z JMA furthest N 850 0C line southern border of Wake county with -1C at RDU:

IMG_3087.thumb.png.d24010c79b81fc0e42d7b7ec82069c0e.png

How is the JMA QPF?

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