Note that two the storms you're referring to (Iselle and Julio) may have similar predicted paths, but they currently 1000 miles away from each other, and will definitely not merge. Iselle is already impacting Hawaii, while Julio will not approach for several days (assuming the current forecast verifies).
Both FTDNA and Ancestry sponsor groups or projects where people in the same haplogroup can exchange information and maybe even find an ancient connection. But Y-DNA and mtDNA are intended to check ancient bloodlines, 10,000-50,000 or so years ago. They are not generally useful by themselves for genealogy.
There are a very limited number of major haplogroups that include Native American results. For mitochondrial DNA, they are A, B, C, D, X and possibly M. I maintain a research list of the subgroups which are Native. Each of these base haplogroups also have subgroups which are European and/or Asian.