During that time , the hurricane began to gain strength at about NUMBER@1 mbar an hour , peaking at NUMBER@2 mbar with winds of on the morning of the 18th .

During that time , the hurricane began to gain strength at about NUMBER@1 mbar an hour , peaking at NUMBER@2 mbar with winds of NUMBER@3 mph -LRB- NUMBER@4 km/h -RRB- on the morning of the 18th .
