The National Weather Service office in San Juan said on Nov 2 that intense heat, scattered showers and thunderstorms would affect Puerto Rico on Monday.^[1] The office said the week would open with sunny periods, passing showers and afternoon thunderstorms.^[2] Rainfall would primarily hit western and northwestern Puerto Rico, the office said, with risks of lightning, urban flooding and small stream rises.^[3] Afternoon thunderstorms are forecast for inland and western Puerto Rico, with elevated flood risk through early Tuesday.^[4] The weather pattern carried into the weekend. The service said Sunday would bring passing morning showers across the island, followed by stronger afternoon rain and thunderstorms over the interior and west.^[5] On Saturday the service issued flood warnings for multiple municipalities,^[6] and on Oct 31 it called for showers and possible thunderstorms during Halloween afternoon and evening.^[7]