A flash flood warning remained in effect for St. Thomas on Tuesday as thunderstorms dumped between two and three inches of rain across the island, with forecasters warning that another one to two inches could fall before conditions improve.
The National Weather Service in San Juan issued the warning at 12:14 p.m. AST, citing radar evidence of heavy rainfall and active flash flooding in low-lying areas, creeks, streams and urban zones. Residents in vulnerable neighborhoods faced the prospect of swift water accumulation in streets, underpasses and drainage systems already taxed by the downpour.
Flash flooding poses a genuine threat to life and property across the island. Vehicles caught in flooded roadways can be swept away in minutes. Pedestrians attempting to cross swollen creeks or rain-swollen streets risk being carried downstream. Homes and businesses in flood-prone areas may experience water intrusion and property damage within hours.
The warning was scheduled to remain in effect until 2 p.m. AST. Residents were urged to avoid driving through flooded areas and to move to higher ground if water began rising near their homes or businesses.
St. Thomas and the broader U.S. Virgin Islands face recurring flooding challenges during heavy precipitation events. The island’s aging infrastructure, combined with topography that channels rainfall into creek beds and low-lying neighborhoods, creates dangerous conditions when storms intensify. Urban areas with limited pervious surfaces struggle to absorb sudden rainfall surges.
The Department of Public Works oversees stormwater systems and drainage infrastructure across the territory. Residents experiencing flooding or observing blocked drainage systems can report issues through the agency’s complaint process.
Motorists should exercise extreme caution on roadways and avoid attempting to drive across standing water. Even shallow moving water can destabilize vehicles. Those in coastal areas should also monitor for possible storm surge or tidal effects if the thunderstorms coincide with high tide periods.
Residents should keep emergency supplies accessible, monitor local weather updates, and have a plan for quick evacuation if water levels rise unexpectedly in their neighborhoods.
