Meteorology · Tropical Cyclones
A tropical cyclone is classified as a hurricane (or typhoon) when sustained winds reach:
- A20 knots
- B64 knots or more✓ Correct
- C100 knots exactly
- D30 knots
Explanation
Maximum sustained winds of 64 knots (about 74 mph) or greater define a hurricane/typhoon. Below that, 34–63 knots is a tropical storm and under 34 knots a tropical depression.
Authority: Bowditch (Pub. No. 9)
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