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December 19-20 Talking Points - Part 3


earthlight

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Guest Patrick

Since they are all in general agreement, it really doesn't matter much. If everyone was posting clown maps from the NAM tonight, we could have all gone to sleep happy. The prospects of a hit are extremely low now, unless we wake up to find that the HCP tossed out the entire 00Z model suite simply because it doesn't make sense synoptically.

what is the more reliable model other than the euro at this point- gfs,nam,ukmet?

Rossi

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Here's what we've got to look for on the upcoming Euro run IMO. Some subtle but very KEY differences. Notice the black circled area, more ridging in the Plains w/ the 12z ecmwf solution versus than 00z GFS. The short wave itself amplfies further south, and one can see the 540 height line being "captured" into the H5 low while the 00z GFS has no such thing. Wave is pretty flat and disconnected. Consequently, heights are backed about 100-150 miles further west on the Euro vs the GFS.

8xvgbl.png

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As with most storms this year, for this threat we've been mostly on the outside looking in... hoping for trends and anything positive to hang our hats on. The modeled hits have been few and far between... and always quickly replaced by ugly misses. More times than not when this is the case and you look back after the fact, you realize that the outcome was pretty apparent all along.

Clearly the NAM and GFS are pretty close... even the UK isn't hopeless. We've come back from bigger deficits before. But none of these are good runs, at the surface or any level.

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I think the models might be responding to that shortwave that passes through Florida at the same time the main wave comes through the mid atlantic. I'm wondering if that is causing the elongation of low pressure off the atlantic coast.. Thoughts, anyone???

I think Jay might be on to something.

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As with most storms this year, for this threat we've been mostly on the outside looking in... hoping for trends and anything positive to hang our hats on. The modeled hits have been few and far between... and always quickly replaced by ugly misses. More times than not when this is the case and you look back after the fact, you realize that the outcome was pretty apparent all along.

Clearly the NAM and GFS are pretty close... even the UK isn't hopeless. We've come back from bigger deficits before. But none of these are good runs, at the surface or any level.

Disagree with the last...GFS is not bad this run except at the surface.

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The prospects of a hit are extremely low now, unless we wake up to find that the HCP tossed out the entire 00Z model suite simply because it doesn't make sense synoptically.

Wouldn't matter. Model consensus slightly outperforms HPC. Besides, it's difficult for a model to violate the very physics it's programmed with. Only thing that will save us is if the model consensus flips back in our favor. And the flipping is not over to be sure... although the extent will likely dampen.

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