1899 San Ciriaco hurricane
Hurricane San Ciriaco set many records on its path. Resulting in at least 3,369 deaths in Puerto Rico, the storm was the deadliest hurricane to hit the island and the strongest at the time, until the Hurricane San Felipe Segundo made landfall in 1928 as a Category 5 hurricane. It was also among the deadliest Atlantic hurricanes ever recorded.
Hurricane Donna
While passing to the north of Puerto Rico, Donna produced winds of in San Juan. Along the north coast of the island, high tides of around and strong waves caused coastal flooding. The hurricane dropped torrential rainfall, peaking at at Naguabo in the central portion of the island. Large areas of eastern Puerto Rico received over of precipitation. The hurricane left about 2,500 people homeless on the island. Despite advanced warning of the floods, the hurricane killed 107 people on the island, of which 84 were in Humacao.