The GLHC uses this scale in 10-min:

The Scale(real)
Category Wind-Speeds
6 ≥173 mph
5 155-172 mph
4 132-154 mph
3 114-131 mph
2 97-113 mph
1 80-96 mph
0 55-79 mph
Named Storm 36-54 mph
Depression ≤35 mph

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