the meteorological service of national hurricane centre designates which tropical cyclone category for cyclones with a maximum (sustained) wind speed of at least 249.0?
(AND meteorology.tropical_cyclone_category (AND (ge meteorology.tropical_cyclone_category.max_wind_speed 249.0^^http://www.w3.org/2001/XMLSchema#float) (JOIN meteorology.tropical_cyclone_category.meteorological_service m.01lvb3)))