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January 5-6 Thing II: STORM MODE


stormtracker
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By this evening when all the models have a good sampling of data I’d say things will be more inline. Which way things go is up in the air. Just pour a drink or spark a bowl. 

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1 minute ago, nj2va said:

UK and GFS comparison at H51 below.  Our SW is a bit further south on the UK but look up north.  UK has a closed low vs open wave on the GFS.  I think that’s impacting it but I’m stoopid so what do I know.

https://www.pivotalweather.com/c706d48f-0b8b-44c9-99db-65baf4e57194

Wish I was in front of the computer to break out the other models and compare that feature. 

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1 minute ago, nj2va said:

UK and GFS comparison at H51 below.  Our SW is a bit further south on the UK but look up north.  UK has a closed low vs open wave on the GFS.  I think that’s impacting it but I’m stoopid so what do I know.

https://www.pivotalweather.com/c706d48f-0b8b-44c9-99db-65baf4e57194

Also at 51 the GFS is closed off at 500 in KY and the UK is not. So the GFS is trying to drive the surface low north. The UK is not. Crazy the difference this close to the event.

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4 minutes ago, nj2va said:

UK and GFS comparison at H51 below.  Our SW is a bit further south on the UK but look up north.  UK has a closed low vs open wave on the GFS.  I think that’s impacting it but I’m stoopid so what do I know.

52a1a4e47256620ac425405670e3bcc3.gif

 

Also, it looks to phase the energy in more than kick it on the GFS. The s/w position at h51 isn’t all that different and really nor are the heights to cause as much ground truth difference. But downstream from this is where the effects are magnified and the big divergence is. 

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1 hour ago, stormtracker said:

WB has it as sleet or something according to Will's map.  You have the sounding?  Sometimes WB paints sleet in snow/close snow situations 

ETA: Nevermind.  Saw you edited and said you checked the sounding

Needs to be >10 J/kg or the hydrometeors won't melt. Verbatim it's still snow.

The real issue is the dry slot impinging aloft around this time, which starts removing most of the ice crystals. Snow growth gets inefficient or flips to snow grains and/or freezing drizzle until around 5pm, when the IC layer is restored as the main vort maxes passes south.

image.thumb.png.ba1d2d9482a77f699a2b0cd950b0507c.png

 

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8 minutes ago, nj2va said:

UK and GFS comparison at H51 below.  Our SW is a bit further south on the UK but look up north.  UK has a closed low vs open wave on the GFS.  I think that’s impacting it but I’m stoopid so what do I know.

52a1a4e47256620ac425405670e3bcc3.gif

 

12z UKMET has a closed vortex over the St. Lawrence Valley, the GFS does not. That appears to be a key difference at 500mb.

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1 minute ago, Eskimo Joe said:

12z UKMET has a closed vortex over the St. Lawrence Valley, the GFS does not. That appears to be a key difference at 500mb.

It's also open at H5 vs. GFS which keeps it closed for a while longer. Makes a difference to the WCB.

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I would not worry about coastal snow being s-se of us. In a transfer it’s almost always missing to ne  that’s the problem.

The overrunning does not look suppressed, The high is building in slowly and does not appear to be a 30.50 suppressive monster 

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