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January Storm Term Threat Discussions (Day 3 - Day 7)


WxUSAF
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This is only a 6 hour panel, so more snow to come esp for eastern areas on the ones that are wet. The thing to note is on many members, like the op, it is warmish and wet at the start of the event. As usual, not a lot of cold air around. The low needs to be amped and take a damn near perfect track for this to work, esp for the lowlands.  Very few southern tracks in the mix.

1611867600-nXwHD21tDy8.png

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NC mets giving legit sounding reasons this thing will still go south while our group is giving legit sounding reasons this will still go a little north maybe meanwhile South Carolina mets are saying what happened to my historic snowstorm. Buckle up kiddies we are about to get on the rollercoaster of joy and despair. My guess a few of you won't make it....my condolences to your pets.

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24 minutes ago, nj2va said:

Yes euro didn’t spit out a foot of snow but I don’t think it was as bad as the reaction. It just needed to be a bit more amped and the solution would have been better. That’s not a huge adjustment to make in the MR. 

It was close. Looking at h5, there are some subtle differences between the Euro and GFS. The biggest one may be the spacing between the developing shortwave and the big NA vortex. A bit more on the GFS, and so it is able to develop more ridging out in front. 

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20 minutes ago, CAPE said:

It was close. Looking at h5, there are some subtle differences between the Euro and GFS. The biggest one may be the spacing between the developing shortwave and the big NA vortex. A bit more on the GFS, and so it is able to develop more ridging out in front. 

Yes, the GFS keeps the 500-mb shortwave mostly coherent as it propagates from AZ on 12z Tuesday to the OH river valley, where it acquires a negative tilt.The shortwave on the Euro loses its coherence over the southwest, keeping some of the energy delayed as the feature moves eastward. The result is a flatter, positively tilted shortwave that produces less favorable interaction with the developing surface low.

There's definitely potential with this system for snow in the mid-Atlantic, but I think there's too much uncertainty right now in how these features will evolve to be confident in any operational model solution.

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1 minute ago, heavy_wx said:

Yes, the GFS keeps the 500-mb shortwave mostly coherent as it propagates from AZ on 12z Tuesday to the OH river valley, where it acquires a negative tilt.The shortwave on the Euro loses its coherence over the southwest, keeping some of the energy delayed as the feature moves eastward. The result is a flatter, positively tilted shortwave that produces less favorable interaction with the developing surface low.

There's definitely potential with this system for snow in the mid-Atlantic, but I think there's too much uncertainty right now in how these features will evolve to be confident in any operational model solution.

Would you consider that to be a bias of the euro with s/w ejection with systems coming out of the southwest like we’ve seen in past storms? 

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This is good info to know. From our Philly board met. 
 

If the GFS went off the rails, it takes about 30 hours of runs to self correct because it uses its own 6 hr forecast to adjust initial conditions.  Hence if it is an error, it gets perpetuated in future runs until a pair of sounding runs expunge it. The Euro starts from scratch each sounding run. So by the 00z run tonight we will know”

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6 minutes ago, Buddy1987 said:

Would you consider that to be a bias of the euro with s/w ejection with systems coming out of the southwest like we’ve seen in past storms? 

Good question; I'm not sure if the differences in the shortwave evolution are caused by something inherent in the model dynamics or differences in the model initial conditions.

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