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18z Model Thread 12/14/10


yoda

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There appears to be some diffremces on the 18z run in contrast with the 12z run on the h5 level, especially with the PV. Look at the 18z 60 and the 12z 66 and compare

Indeed. The PV is more symmetrical at 18z, thus providing a little more confluence over the northeast at hour 60. Out west, the ridging is greater, and the shortwave phasing into the trough around the four corners region looks sharper.

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Its still gonna whiff areas north of say Fredericksburg probably. Looks like an interesting system for KY and SW VA....WSW up down that way

Yeah, GFS was more bullish at noon and now the NAM could be following. Backwards---

NAM as is 2-4 inches--all snow. Maybe some -zr at the end.

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Who knows what's right, but both NAM and GFS have trended more north with the system Thurs. The SREF's have as well. Who knows what will happen, but that's the trend.

Edit: Also, the timing of this thing is quite variable with the last four runs of the NAM. Don't know what to make of that either, but it's there.

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Any update for the weekend in the latest run? Seems like the hotter chance.

The NAM has decent ridging alone the SE coast---both at 18z and 12z---everything is a smidge quicker at 18z and the energy is a little more ragid, but it looks like in the next 12 hours our storm would form.

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Its still gonna whiff areas north of say Fredericksburg probably. Looks like an interesting system for KY and SW VA....WSW up down that way

It also looks like a high bust potential in that the temps are iffy. Of course I'm only looking at 850's and I imagine that the surface will still be cold. But as someone who grew up down there, on the other side of those mountains, warm air pushing in from the SW wins every time in most places.

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Explain, in detail. How and why is it a miss?

Looks like the NAM is a much better setup. The actual solution of the system is well-beyond the range of the NAM though. s/w is digging and the ridge out West is popping. All the while, the blocking ridge is still retrograding and there is energy over the Lakes just waiting to get pushed South into the amplified STJ.

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Looks like the NAM is a much better setup. The actual solution of the system is well-beyond the range of the NAM though. s/w is digging and the ridge out West is popping. All the while, the blocking ridge is still retrograding and there is energy over the Lakes just waiting to get pushed South into the amplified STJ.

Yes, thank you. I know its beyond the range for the day of, but interesting for the setup itself. Back in another 6.

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Looks like the NAM is a much better setup. The actual solution of the system is well-beyond the range of the NAM though. s/w is digging and the ridge out West is popping. All the while, the blocking ridge is still retrograding and there is energy over the Lakes just waiting to get pushed South into the amplified STJ.

The amplification compared to the GFS is noticeable at 42 hours...

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