The flash flood watch in effect since the weekend for the U.S. Virgin Islands and Puerto Rico has been extended until 6 a.m. Tuesday by the National Weather Service in San Juan.
According to the NWS, a very moist weather pattern will continue to prevail across the region through at least early Tuesday.
“This deep tropical moisture, combined with local effects, will keep chances high for shower development and isolated thunderstorms across the local islands,” the weather service reported. “These showers and thunderstorms are expected to leave additional rainfall accumulations anywhere between one to three inches through at least 6 a.m. … These heavy rains will bring rapid rises in area rivers and streams and will make transiting on roads in low lying areas impassable.”
The advisory said additional rain will trigger dangerous mud slides and debris flows without warning.
A flash flood watch means conditions may develop that lead to flash flooding. The weather service urged residents to monitor forecasts and be prepared to take action should a flash flood warning be issued.