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Extreme Cold, Snow & Sleet: SECS 1/25 - 1/26


TriPol
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3 minutes ago, jdj5211 said:

Icon Kuchera…half of NJ misses out on big snows

3845c95cbc29f52ae65dfcc3b25f800c.jpg


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People need to stop using those maps and look at soundings to see if there are good chances for high ratios. If in doubt use 10-1. You want a saturated -12 to -18C layer and strong lift. Surface temps don’t determine ratios if you’re below freezing. 

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Just now, jm1220 said:

People need to stop using those maps and look at soundings to see if there are good chances for high ratios. If in doubt use 10-1. You want a saturated -12 to -18C layer and strong lift. Surface temps don’t determine ratios if you’re below freezing. 

I've tried... people like the pretty maps! 

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The general rule of thumb is that clown maps are for clowns. They aren’t useful for making serious weather forecasts. They don’t account for a lot of things. The short term models like the HRRR are useful for picking up banding or mixing issues. 
 

You have in this case a raging jet stream slamming into a brick wall of dense, dry arctic air. It gonna snow, a lot.

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From Ryan Maue on X:

 
We can partition the model output by how much "snow" will fall -- and then apply a "snow to liquid" ratio (SLR) which is typically 10:1 at temperatures around freezing. But this snow will be falling in frigid air 8°F to 18°F so SLR > 15:1 or 18:1 Do the math: 1.4" QPF x 18:1
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34 minutes ago, weatherpruf said:

when this poster gets serious, i pay attention; i remember this quote from Jan 2016; "this is a storm for the ages.." 

 

34 minutes ago, forkyfork said:

also the dgz runs from the surface to near 500mb with a ton of moisture slamming into it

image.thumb.png.99631f41b6639e3de83446a9ad91a367.png

 

ecmwf_mslp_pwata_eus_36.png

forky, when serious, reminds me of the vintage E F Hutton commercials. As always ….

 

IMG_1943.png

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8 minutes ago, forkyfork said:

it's been so long since we've had this

image.thumb.png.f5de9897b7ad428b9bd9a0fb5e90ee8b.png

Reminds me of a lighter version of Valentines 2007 setup. Models 4-5 days out had a MidAtlantic bullseye only to result in heaviest snows in NE and a ton of sleet in MidAtlantic up to NYC. When you see that heart shaped CAD signature often indicates a pretty strong warm push aloft. Just depends how far north it gets.

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Modeling through 06Z and ICON at 12Z so far have been pretty steady with QPF of between .7" and 1.1".  Be happy. Be ecstatic with that right now.  Be happy. Be ecstatic with 10:1 - 12:1 ratios.  Consider anything above 12:1 as gravy *IF* it happens.  To assume at this point 15:1 or 20:1 is just foolish. 

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  • TriPol changed the title to Extreme Cold, Snow & Sleet: SECS 1/25 - 1/26

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