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January 28-30th Possible Nor'easter


Rjay
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1 hour ago, larrye said:

I'll ask you the same question I asked someone else earlier. What good is a favorable H5 if the surface doesn't reflect it? Are you also saying that perhaps the surface features on the next run will better reflect the H5?

The surface features should reflect what's going on above (e.g., H5). There can be reasons they don't reflect it completely, but in general if the H5 forecast is bad, so will the surface forecast be bad.  In other words, if you make a wrong turn and don't know it, the next turn is going to be wrong too.  So short answer to your question, the H5 is no good (as in it doesn't matter regarding the weather you experiences at the surface) if the surface doesn't reflect it, but you're unlikely to get a good surface chart without a good H5 setup.

There's probably stuff that is not technically correct about this explanation, but I hope it helps with understanding in a broad sense.

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1 minute ago, MANDA said:

NAM has same double low structure at H39.  In close proximity.  Hopefully western one dominates because if it does the 500 looks more a little more favorable than 12Z.  Next few time steps should be somewhat interesting.

At 42 it picks the eastern one, but it does look better by a bit than last run at this point.

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