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.
While research is one possible use of genetic information, this information can also be used to examine how people are related to one another by comparing the similarity of their DNA sequences. Genetic information can also provide clues to ancestral relations. DNA is obtained by collecting biological samples (e.g., blood, hair, cells from a cheek swab, or even from spitting in a cup). Genetic testing has been advertised to tribes as a tool for determining their enrollment (TallBear 2003).NA is obtained by collecting biological samples (e. g., blood, hair, cells from a cheek swab, or even from spitting in a cup). Genetic testing has been advertised to tribes as a tool for determining their enrollment (TallBear 2003).