Input (grade 10): During that time, the hurricane began to gain strength at about 1 mbar an hour, peaking at 963 mbar with winds of on the morning of the 18th.
Output (grade 11): During that time, the hurricane began to gain strength at about 1 mbar an hour, peaking at 963 mbar with winds of 115 mph (185 km/h) on the morning of the 18th.