1899 San Ciriaco hurricane
The hurricane weakened slightly while moving west-northward across the Caribbean Sea and made landfall in Guayama, Puerto Rico late on August 8 with winds of 140 mph (220 km/h). August 8 was the namesday of Saint Cyriacus, hence the hurricane's nickname. Several weather stations across the island reported low barometric pressures, with a reading as low as in Guayama. Wind shifts were also experienced across the island, primarily in the south and the west. The storm crossed Puerto Rico in approximately six hours and emerged into the Atlantic Ocean late on August 8, while weakening to a Category 3 hurricane, with winds decreasing to 120 mph (195 km/h). The hurricane would maintain this intensity for more than nine days. Continuing west-northward, the hurricane brushed the north coast of Dominican Republic on August 9. Thereafter, the system moved slowly northwestward through the Bahamas, striking Inagua on August 10 and Andros Island on August 12. According to telephone and telegraph reports from the Weather Bureau, the storm was predicted to make landfall in Florida.
1985 Puerto Rico floods
The most intense rainfall occurred on October 6, and on that day two stations recorded 24-hour precipitation totals exceeding . These totals broke the 24-hour rainfall records set during the 1899 San Ciriaco hurricane, and amounted to nearly half of the annual precipitation totals. The town of Peñuelas reported very high rainfall totals in a short amount of time, including in one hour and in two hours. The highest rainfall total on Puerto Rico was in Toro Negro State Forest. Rainfall spread across the island, and the southern half of Puerto Rico experienced totals of over . Rainfall totals over spread across the United States Virgin Islands. The tropical wave later spawned a low pressure area north of Hispaniola that became Tropical Storm Isabel on October 7, a day before the rains subsided in Puerto Rico. The storm ultimately struck Florida before dissipating on October 15.