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To be classified as a hurricane, a tropical cyclone must have one-minute-average maximum sustained winds at 10 m (33 ft) above the surface of at least 74 mph (64 kn, 119 km/h; Category 1). [1] The highest classification in the scale, Category 5 , consists of storms with sustained winds of at least 157 mph (137 kn, 252 km/h).
A Category 4 hurricane has winds of 113 to 136 kn (130 to 157 mph; 209 to 252 km/h), while a Category 5 hurricane has winds of at least 137 kn (158 mph; 254 km/h). [1] [3] A post tropical cyclone is a system that has weakened, into a remnant low or has dissipated and formal advisories are usually discontinued at this stage. [1]
Typhoon Haiyan (Yolanda) on November 7, 2013, one of the strongest Pacific typhoons ever recorded.. Since 1947, the Joint Typhoon Warning Center (JTWC) has classified all typhoons in the Northwestern Pacific Ocean with wind speeds of at least 130 knots (67 m/s; 150 mph; 240 km/h)—the equivalent of a strong Category 4 on the Saffir–Simpson scale, as super typhoons. [1]
PAGASA's Tropical Cyclone Intensity Scale [1] [2] Category Sustained winds Super typhoon (STY) ≥185 km/h ≥100 knots: Typhoon (TY) 118–184 km/h
Once a tropical storm strengthens into a hurricane, it earns a category designation on the Saffir-Simpson Hurricane Wind Scale: 1 through 5.
5: 96: Destructive winds are possible within 96 hours. Only used outside of the typical typhoon season; from December 1 to May 31. Review all other TCCOR level actions. 4: 72: Destructive sustained winds of 50 knots or greater possible within 72 hours. Lowest level of alert during the typhoon season (June 1-November 30)
As it gains power, it will also increase in categories on the official hurricane wind scale, which goes from 1 to 5. Category Two Hurricane Helene on NOAA satellite on Thursday morning, Sept. 26 ...
The "Less than 1" score provides insight on hurricanes and tropical storms that don't rise to a Category 1 on the Saffir-Simpson scale. Storms designated with this rating may still cause ...