Going to mention this here to start, but while the shorter-term attention is on the trough coming through around 3/23-24 for appreciable severe potential, something bigger may be lurking right in behind if the following system amplifies more in the west. This has been a trend in the ensemble guidance for the last several runs.
The lead system never really makes much of a dent in the Gulf as far as frontal intrusions go. What's left behind is a very moist air mass waiting to be pulled north. The 500 mb setup around 3/26-27 on all of the 12z models except the GFS (lol) would indicate the possibility of a rather large scale severe weather event should a couple of tweaks occur. It probably does need to amplify a bit more to get an earlier low-level response for pulling moisture north, but the signal is generally for a broad-based trough with a very intense jet max and strong flow overspreading a large area. All will depend on track/initial amplification and the timing/magnitude of the low-level response and surface cyclogenesis.
Below is the run-to-run 500 mb mean shift in the last few runs of the EPS. Can see how it's shifting slower (more wave spacing) and deeper, both of which would allow for more modification following the 3/23-24 system.