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December 16-17, 2020 Winter Storm Obs/Nowcasting


WxUSAF
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1 minute ago, 40westwx said:

the 20s and sleet obs in Blacksburg are a little worrisome to me.. but I think that will be overcome by rates/ evap cooling.. should be a good lesson in Mid Atlantic Climo either way.. 

Blacksburg is a long way away and only at the far edge of the cad

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Just checked the 12z RAOB out of IAD. There appears to be a bit of a warm nose somewhere around 800 mb, but there's a bit of dry air above and below it. I wonder if the dry air would allow precip to cool the column more effectively and maybe offset that. It would have big implications for snow totals, especially down towards the cities if we can really thump for a few hours as SN or even +SN.

12zIADRAOB_121620.thumb.PNG.c96b7764a73a20f2d53d8f4c7f44a06e.PNG

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