I asked Google Gemini to take a look at the 12z WeatherNext model and compare it to 06z. First, it made up a bunch of stuff. Then it made up more stuff. After insulting it literally a dozen times, I was able to get it to at least pretend to give me some data that was plausible. Here, I asked it about trends in the precip shield:
The 06z Shield: Showed the edge of the precipitation (roughly 0.01"–0.05" liquid) flirting with the DC/Baltimore line.
The 12z Shield: Pushed that shield about 40–60 miles further southeast. The 12z panel for 84 hours out shows DC entirely in the "dry zone" (the white space on the map), with the moisture field cut off near Fredericksburg and the Chesapeake Bay.