In the original solutions before we had much of a storm, the shortwave was just sliding off the southeast coast with no consequence and we were discussing how wave #3 would be the one.....what's happening since then is that shortwave #2 digs way down south and slows down so that when shortwave #3 approaches, it's partially phasing it allowing it to climb the coast as an inland runner.
But yeah, even on the 06z GFS, the trough is positively tilted still at the MS River...even over the TN Valley too.