Flash Flood — Bayamon, Puerto Rico

2025-07-20 · near Bayamon, Bayamon, Puerto Rico

$5K

Property damage

Event narrative

The 911 call center reported that one person was trapped in their home due to urban flooding in Urb. Santa Rosa, 17th Street, Block 15.

Wider weather episode

Lingering moisture and marginal instability associated with a nearby upper-level low to the northwest, combined with breezy east-southeast low-level winds, led to isolated to scattered showers over eastern Puerto Rico early in the morning. As the day progressed, showers and cloudiness spread across much of Puerto Rico, with more frequent and intense showers and isolated thunderstorms developing over the San Juan metropolitan area (particularly over Bayamon, Catano and Toa Baja where flooding and flash flooding reports were received) and parts of north-central to northwestern Puerto Rico during the afternoon. Rainfall totals of up to four inches prompted Flood Advisories and Flash Flood Warnings in the San Juan metro area.

View location on OpenStreetMap → (18.3903, -66.1437)

Source: NOAA Storm Events Database, event_id 1278938. Narrative written by the NWS forecast office that issued the report.