Dalila — 2025

A small tropical cyclone formed from a tropical wave that moved off Central America and organized into a tropical depression around 1200 UTC on 13 June 2025 about 250 nautical miles south of Zihuatanejo, Mexico. The system became Tropical Storm Dalila that evening and tracked generally northwestward, staying offshore of southwestern Mexico. Dalila reached peak strength on 14 June while centered about 160 nmi south of Manzanillo, then turned west-northwest and moved away from the coast, losing deep convection and becoming post-tropical after 1800 UTC 15 June. The remnant low persisted and dissipated late on 17 June several hundred miles southwest of the southern tip of Baja California Sur. Dalila did not make landfall. Tropical Storm Watches and Warnings were issued for portions of the southwestern Mexican coast (including Tecpan de Galeana, Lazaro Cárdenas, Playa Perula, Cabo Corrientes, and Manzanillo) as the storm approached, but observations and the NHC analysis indicate the cyclone remained offshore and no confirmed tropical-storm-force sustained winds were recorded onshore. The storm’s maximum sustained winds were estimated at 55 knots (about 63 mph) and its minimum central pressure was estimated at 992 millibars at peak, making it a moderate tropical storm rather than a hurricane. Dalila’s outer circulation produced locally heavy rainfall along the coast of southwestern Mexico. The highest measured total was 7.48 inches (190 mm) at Laguna de Coyuca, Guerrero (near Acapulco). The report notes rainfall impacts in the states of Guerrero, Michoacán, and Colima; specific storm surge measurements were not reported, and there were no reliable observations of coastal storm-surge heights tied to Dalila. There were no known fatalities attributed to Dalila. Some flooding and mudslides occurred near Acapulco, and media sources reported about $40 million (USD) in associated damage. The most affected areas were coastal Guerrero (including Acapulco), parts of Michoacán, and Colima where the heaviest rains fell. Notable points: Dalila was the earliest fourth named storm in the east Pacific on record since reliable records began in the 1970s. NHC forecasts and watches were issued in advance; genesis was well anticipated in the Tropical Weather Outlooks, and official track and intensity forecasts performed at or better than recent mean errors for short lead times.