The National Weather Service (NWS) in San Juan reported on Saturday that a trough would cause showers and thunderstorms in Puerto Rico on Sunday. The NWS also warned of a moderate risk of rip currents at beaches on the north and east coasts of Puerto Rico, as well as in Culebra. According to the NWS, the showers and thunderstorms that began during the early hours of the day would extend into the afternoon towards the interior and northwest of the island.
For the rest of the week, the NWS forecasted an unstable atmospheric pattern, which would favor daily showers and thunderstorms. The NWS indicated that weaker winds on Tuesday and Wednesday could favor the development of slow-moving thunderstorms and greater rainfall accumulations in specific areas, especially along the Cordillera Central and in the interior and northwest of Puerto Rico.
The NWS also warned that the strongest thunderstorms could produce frequent lightning and strong wind gusts, generating hazardous conditions on land, at beaches, and in local waters. Conditions are not expected to normalize until after the middle of the week, with a limited to elevated risk of flooding persisting until Thursday. The NWS advised seeking shelter immediately if thunder is heard.