Compare runs NAM 250mb

12z SLP                00 06 12 18 24 30 36 42 48 54 60 66 72 78 84
06z SLP           00 06 12 18 24 30 36 42 48 54 60 66 72 78 84
00z SLP      00 06 12 18 24 30 36 42 48 54 60 66 72 78 84
18z SLP 00 06 12 18 24 30 36 42 48 54 60 66 72 78 84