Flash Flood · Puerto Rico

Flash Flood April 17, 2026 – April 18, 2026 · San Sebastian, Puerto Rico

$4K

Damage as recorded

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Rio Sonador overflowed near PR-417 in Sector El Yugo. Agricultural losses were also reported in the yard of the houses closer to the river.

The wider storm

An amplifying mid- to upper-level trough, combined with above-normal moisture, maintained an unstable, wet pattern. With previous rain left saturated soils and elevated rivers, heavy rainfall quickly lead to urban flooding, small stream flooding, river flooding, landslides and flash flooding. Significant flooding occurred in Las Piedras, particularly, where several houses where flooded and flash flooded following heavy rainfall.

Began near San Sebastian (18.3258, -67.0240).

Source: NOAA Storm Events Database, event 1333336. Narratives are written by the National Weather Service forecast office that issued the report.

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