That nam run wasn't included in its guidance. It came after 3:20. That being said the other mesoscale model with any legitimacy the rgem didn't fall apart like the nam at all. In fact the rgem was a little better than it's previous run.
It's because one of the 2 major weather models relied on most heavily to forecast weather in the US is still showing over a foot for most of Long Island.
It still has that double barrel low thing going on but I think the models will resolve this eventually. Choosing the left side would be ideal for us lol
Not being facetious when I say this, but they are always getting new data. Thus we shouldn't be surprised to see waffling around. Especially in this set up.
the Euro on it's previous 06z run and 12z run and NAM on it's 12z model run did a similar thing with the low depiction. Hopefully it's just temporary noise that resolves over the next few runs and gets the weenies of the ledge.