Alvin — 2025

A well-defined circulation formed late on 28 May about 410 nautical miles southwest of Acapulco, Mexico. The system became a tropical depression at 1800 UTC 28 May and strengthened into Tropical Storm Alvin on 29 May as it moved generally west-northwestward. Alvin reached its peak on 29–30 May and then gradually weakened while continuing westward and away from the Mexican coast, becoming a remnant low and dissipating by 1 June. Alvin did not make landfall. The storm stayed well offshore of southwestern Mexico for its entire life, and no coastal watches or warnings were required. The storm’s maximum sustained winds reached 50 knots (about 58 mph) from 1800 UTC 29 May to 0000 UTC 30 May, and its estimated minimum central pressure was 999 mb. These values correspond to a moderate tropical storm at peak intensity. Because Alvin remained offshore, storm surge impacts were not reported. Rainfall and coastal flooding totals associated with Alvin were not notable in the official record; the only local observation mentioned was from a Mexican Navy automated station on Socorro Island, which recorded a 23 kt sustained wind and a 31 kt gust at 2240 UTC 30 May as Alvin passed well to the east. There were no reports of damage or casualties associated with Alvin—no direct fatalities were reported. Regions most affected were limited to offshore waters; no populated coastal areas recorded notable impacts. Forecast products performed well: NHC’s genesis outlooks gave long lead times for Alvin’s formation, and the official track and intensity forecasts had errors lower than or comparable to recent five-year means. No coastal watches or warnings were issued because the storm remained far from land.