 They have been quite busy boarding up homes and businesses and mass evacuations are underway as Hurricane Beryl approaches the Caribbean's Windward Islands. National Hurricane Center's Michael Brennan says this is one powerful storm. We're most concerned about areas from St. Vincent and the Grenadines south to Grenada where we could see the core of that Category 4 hurricane move through. When you get to Category 4 strength, you can see things like total roof damage, roofs lifted off of homes, exterior wall collapse.