Hebert's Box is named for forecaster Paul Hebert, who determined that the majority of strong hurricanes that hit South Florida in the last 100 years had also passed through one of two specific regions in the Caribbean Sea. One Hebert Box is positioned near the Cayman Islands, while the other incorporates the Virgin Islands. Basically, if Irma passes over the Virgin Islands, Miami better watch out. Wikipedia isn't always the best source, but here's that link. https://en.wikipedia.org/wiki/Hebert_Box