Surprised I haven't seen any discussion about this bomb on the board.

Check out the DT pressure map I attached below. You'll never see a better signature of a tropopause fold. And obviously all sorts of upper level support with massive divergence aloft.

From Ryan Maue:

I used the full-resolution (T574) surface pressure grids from NCEP GFS for the data points:

1000 mb ... (13/12z)

994 mb ... (13/18z)

989 mb ... (14/00z)

978 mb ... (14/06z)

960 mb ... (14/12z)

946 mb ... (14/18z)

940 mb ... (15/00z)