Trying to add up snowfall with a very strong & very fast moving front is going to be a challenge for any algorithm, which is why you end up with artifacts like this:

Is Morgantown going to get ~7" while Allentown gets 0.0"? Both are unlikely.

Taking a step back, when is the last time there was significant post-frontal snow in the Northeast?

For good anafront precip, you need the left exit region of the jet to remain behind the front, which is not the case here.

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