BAM's is a basic model that takes the trajectory from AVN and adds some over unique dynamics. It's usually best when ran for shallow sheared systems, which this kinda of what Frank is....so. BAMM and BAMD are usually better, but I believe BAMS is an overall consensus of the three.

Edit: see the post two down for more. BAMS is just the shallow version of the model, not a combination of the others. The BAM-series models do best not necessarily for shallow sheared storms, but for storms in the deep tropics where there is little influence from mid-latitude features (and thus storms largely move with the large-scale flow). --Clark