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.
This combination of the Y-DNA and mtDNA tests traces the paternal and maternal ancestry of males. Results are placed in our Y-DNA and mtDNA databases and identify the ethnic and geographic origin of the maternal and paternal lines. If African in origin, results are compared with the African research database and the likely region of origin within Africa is identified.