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.
AncestryDNA is an autosomal DNA test that examines your unique genetic code for clues about your family history. Then we use genetic science to determine family relationships within our database of AncestryDNA members and your ethnicity origins.AncestryDNA extracts your DNA from a small saliva sample. Y-DNA test follows one family line on the chart, from son to father. An mtDNA test also follows only one line, the maternal line. The autosomal test looks at your entire family tree. 2 THE INSIDERâS GUIDE TO DNA Tip: Get your parents, grandparents, and siblings tested too.