So let's see what happened on the 06z runs.
NAM has 3 waves of precip starting with the lead wave, then 2 other waves of precip, bulked the snow up back into OK compared to previous runs.
RGEM also has 3 waves of precip starting with the lead wave and 2 other waves of precip. It continues to play catch up with amounts.
GFS was farther south with the precip shield on the first storm, and the second storm's precip shield was farther west.