The National Weather Service issued a flash-flood warning Saturday for Bayamón and Toa Alta in Puerto Rico, saying thunderstorms had produced heavy rain and flash flooding was ongoing or expected to begin shortly.
The San Juan office issued the warning at 2:46 p.m. Atlantic Standard Time November 7. It remains in effect until 5:45 p.m. AST, equivalent to 3:45 p.m. Central Standard Time.
Radar indicated that between 1 and 2 inches of rain had fallen across the warned area. An additional 1 to 2 inches was possible, according to the bulletin. Those figures describe the rainfall estimate and additional forecast, rather than a uniform measured total for every location.
The agency identified small creeks and streams, urban areas, highways, streets, underpasses and other low-lying or poorly drained locations as places where flash flooding could occur.
The warning is based on radar-indicated thunderstorms. It does not establish that every road in the two municipalities is flooded or that damage has occurred at a particular property.
The weather service urges people to remain aware of their surroundings and avoid driving onto flooded roads. Its warning advises motorists to turn around when encountering water over a roadway.
The alert applies to the identified parts of Puerto Rico, rather than the entire territory. Its stated expiration is the end of the warning period, not confirmation that every affected road will be clear immediately afterward.
Sources: National Weather Service San Juan — November 7, 2:46 p.m. AST flash-flood warning.