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January 5-6 Thing Storm Obs


snowfan
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5 minutes ago, bncho said:

If any mets are in here, can they explain why the snow growth is kinda bad?
I'm eyeing another band to hit my area around 7:30. I need the snow growth to be better. I need some fatties.

I mentioned yesterday that snow growth may not be great. The DGZ is rather small and higher up in the atmosphere. Most of the forcing is from the 850-700 area with some of the heaviest echoes producing better flakes as that lift reaches deeper into the atmosphere. So basically you have the lower vis, small flake type stuff. 
 

This aftn will be better snow growth, but probably a lot of that 3/4 to 1SM type snow where even though the vis isn’t that low, it still adds up. 

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Was getting a little subsidence ahead of that band for the last 20 mins or so, but now both flake size and rates picking back up as it approaches.  Should be a good next hour+ for HoCo. 

I was always skeptical of ratios much more than 10:1 with the WAA precipitation except for the far north folks.  For dendrites, you want temps in the snow growth area aloft between -10 and -20C.  And also aligned with the best vertical motion AND not overly strong horizontal winds.  Didn't really look like that before this evening's snow.

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1 minute ago, diatae said:

Aaaaand we're pinging. 

 

1 minute ago, WxUSAF said:

Was getting a little subsidence ahead of that band for the last 20 mins or so, but now both flake size and rates picking back up as it approaches.  Should be a good next hour+ for HoCo. 

 

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1 minute ago, WxUSAF said:

Was getting a little subsidence ahead of that band for the last 20 mins or so, but now both flake size and rates picking back up as it approaches.  Should be a good next hour+ for HoCo. 

I was always skeptical of ratios much more than 10:1 with the WAA precipitation except for the far north folks.  For dendrites, you want temps in the snow growth area aloft between -10 and -20C.  And also aligned with the best vertical motion AND not overly strong horizontal winds.  Didn't really look like that before this evening's snow.

We go through this every season. Folks have visions of high ratio fluff, but it takes perfect conditions to pull off. It’s never easy and it’s not all about surface temps like so many believe. 

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