Tropical Cyclone Classification

Classification Maximum 10-Minute Mean Wind Speed
Tropical Depression (TD) <35 knots (<65 km/h)
Tropical Storm (TS) 35-49 knots (65-89 km/h)
Severe Tropical Storm (STS) 50-64 knots (90-117 km/h)
Typhoon (TY) >64 knots (>117 km/h)