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Model Mayhem II!


SR Airglow

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I would argue too that the mid-levels look pretty nice...probably better than the QPF output does. Not worth really parsing too much yet, because this is probably not the final solution given the notable changes we saw on the 12z suite across the board.

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4 minutes ago, ORH_wxman said:

I would argue too that the mid-levels look pretty nice...probably better than the QPF output does. Not worth really parsing too much yet, because this is probably not the final solution given the notable changes we saw on the 12z suite across the board.

Yeah it really is a nice look at 500 mb. Wouldn't take much to see a pretty dramatic shift west with the QPF. 

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Just now, dryslot said:

Northern stream s/w

Here's where the PNA ridge comes into to play...a more amped PNA ridge will help push the lakes energy more south rather than east so that the southern stream has room to round the base and come up the east side of the trough....so we'll want to root for a more amped PNA ridge. A sharper southern stream can help too.

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Just now, ORH_wxman said:

Here's where the PNA ridge comes into to play...a more amped PNA ridge will help push the lakes energy more south rather than east so that the southern stream has room to round the base and come up the east side of the trough....so we'll want to root for a more amped PNA ridge. A sharper southern stream can help too.

Yeah looking at the 500 hpa dprog/dt from 00z to 12z the northern stream s/w didn't do much while the southern stream energy was sharper and the downstream ridge a bit sharper. It really helped pull it all back a bit farther NW.

You can see on the 12z NAM/GFS soundings that really all the lift back here is coming from that sweet looking southern stream s/w. A classic 500mb omega bomb on the NW fringe. Just have to make sure we manage to saturate the whole column and stuff.

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1 minute ago, CT Rain said:

Yeah it really is a nice look at 500 mb. Wouldn't take much to see a pretty dramatic shift west with the QPF. 

Yeah if you looked only at the H5 map between 60-66 hours, you'd think the precip would be quite a bit more expansive to the west than it actually is. At any rate, at minimum, this is a serious threat now rather than a hail mary. Still not sure if we can get more than advisory snowfall west of BOS-PVD...but there's a realistic path now.

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2 minutes ago, ORH_wxman said:

Here's where the PNA ridge comes into to play...a more amped PNA ridge will help push the lakes energy more south rather than east so that the southern stream has room to round the base and come up the east side of the trough....so we'll want to root for a more amped PNA ridge. A sharper southern stream can help too.

Yeah, We would need it more south as it would help with the trough as well, It looks like the models are grabbing hold of the sharper more amped southern s/w now, So if that continues or even gets slightly better as well as the pna ridge continuing to be better as well, Then there should be more room for this one to come west, But still think there is a limit to how far west it really can go.

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1 minute ago, CT Rain said:

Yeah looking at the 500 hpa dprog/dt from 00z to 12z the northern stream s/w didn't do much while the southern stream energy was sharper and the downstream ridge a bit sharper. It really helped pull it all back a bit farther NW.

You can see on the 12z NAM/GFS soundings that really all the lift back here is coming from that sweet looking southern stream s/w. A classic 500mb omega bomb on the NW fringe. Just have to make sure we manage to saturate the whole column and stuff.

Great post. Glad something sufficiently interesting may be on tap to pull you back to the board. Nice trends so far today. 

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I remember Boxing Day went from a well out to sea miss, to a big coastal on 12Z runs, the WPC claiming model data problems/errors, 18 and 0Z all models on board for MECS HECS.  And, as the next 36 hours unfolded, it kept trending more west and closer tucked in to the point that we didn't do particularly well n of CON.  Our BW with 12-18 didn't verify.  Maybe this can tuck in closer if it intensified explosively.

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