The Bamm does better with weak systems, (Ie when Irene was a disorganized tropical storm). They are not global models and fairly shallow. Once a system gets organized, they are pretty useless since a large hurricane does not qualify.
Usually you use a combination of the BAMM models and globals early on (neither are all that great, but the BAMMs are good for finding trends while it's still a weak invest or disorganized tropical storm). Once a system gets a solid center of circulation it loses its luster, while the globals like the GFS and especially European tend to do much better.
In reality the BAMMs aren't considered at all by the NHC once a storm is formed.
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