Actually, these mega swaths are more apparent on the last few runs of the HRRR (like you posted). Kind of alarming to see the same tracks show up on the 12z, 13z, 14z, 15z and 16z run. It seems like normally there's deviation across 5 runs, but these mega swaths are there for 5 straight runs! Sent from my Pixel 3 XL using Tapatalk