gfsanl_3_20151201_0000_006gfsanl_3_20151201_0000_006
means that the analysis was made at 0000 UTC and is valid at 0600 UTC, doesn't it? But for how long, 3 hours?
And what is the difference to gfs_4_20151201_0000_006gfs_4_20151201_0000_006
, which is listed under GFS forecast?
I cannot figure out the difference between those two.
Thanks for helping!