Adrian (2017)

A small tropical cyclone formed from a tropical wave and a Gulf of Tehuantepec gap‑wind circulation and became a tropical depression about 275 nautical miles south‑southwest of the El Salvador–Guatemala border around 1800 UTC on 9 May 2017. It strengthened to Tropical Storm Adrian six hours later and moved generally west‑northwest to northwest under the influence of a ridge to its north. Adrian was short‑lived: it reached its peak early on 10 May, began weakening the same day as increasing mid‑level wind shear removed convection, became a post‑tropical remnant low by 0000 UTC 11 May, and dissipated by 1200 UTC 12 May about 140 n mi south of Puerto Ángel, Mexico.

Adrian did not make any landfalls. Its entire life cycle occurred over the eastern North Pacific well south of the coast of Central America and Mexico, and no coastal watches or warnings were required.

The storm’s maximum analyzed intensity was 40 knots (46 mph) at about 0600 UTC on 10 May 2017, with a minimum central pressure of 1004 mb. At peak it was a weak tropical storm (below hurricane strength).

No storm surge reports are associated with Adrian in the official record, and the report lists no rainfall totals or other hydrologic measurements of note for coastal cities or counties. Because the cyclone remained offshore and relatively weak, there are no specific surge heights or significant measured rain accumulations cited in the NHC report.

There were no reports of damage or casualties—no direct or indirect deaths were recorded—and impacts were minimal given Adrian’s brief life and offshore track. The storm was notable for being the earliest‑forming named storm on record in the eastern North Pacific basin.

Forecasters anticipated development several days in advance and issued a Special Tropical Weather Outlook up to 96 hours before genesis; however, Adrian formed sooner than expected and its short lifespan limited the number of verifying forecasts. Many intensity models overestimated strengthening, partly because they did not fully capture the mid‑level wind shear that ultimately prevented intensification.