Andres (2021)

A small tropical cyclone formed well offshore of southwestern Mexico and existed from 9 to 11 May 2021. The disturbance that became Andres organized into a tropical depression around 0600 UTC 9 May about 350 nautical miles south-southeast of Socorro Island, became a tropical storm six hours later, moved generally northwest to north-northwest, weakened to a depression late on 10 May, degenerated to a remnant low by 0600 UTC 11 May, and dissipated by 1800 UTC 12 May several hundred nautical miles southwest of Socorro Island.

Andres remained over the open eastern North Pacific and did not make any landfalls. No coastal watches or warnings were required and the cyclone stayed well away from the Mexican coast during its lifetime.

The cyclone’s peak intensity was estimated at 35 knots (40 mph) with a minimum central pressure of 1005 mb, corresponding to a minimal tropical storm (below hurricane strength). The peak estimates are based on multiple satellite intensity analyses and pressure–wind relationships.

No storm surge or coastal inundation was reported. There were also no observations of tropical-storm-force winds from ships or buoys associated with Andres. The NHC report lists no rainfall totals at specific cities or counties tied to the cyclone, since Andres remained far offshore and its convection was displaced away from the center.

There were no reports of damage or casualties—no direct or indirect deaths were attributed to Andres. The primary impacts were limited by the storm’s brief life and its location over open water.

Notable points: Andres was the earliest-forming tropical storm on record in the eastern North Pacific basin, surpassing the previous record by about 12 hours. The NHC’s forecasts of Andres’ formation, track, and intensity performed well relative to typical verification metrics, with official forecasts showing lower-than-average errors for this short-lived system.