Tropical Storm Andres – (Per Wikipedia) On May 7, 2021, a low-pressure system formed several hundred miles southwest of the southern coast of Mexico and was forecast to move into more favorable conditions by the weekend.
By May 8, the disturbance’s thunderstorms started to quickly organize, and the system was designated as Tropical Depression One-E at 09:00 UTC on the next day. At the time, the system’s center became well-defined and located east of a well organized mass of convection despite the negative impact of moderate west-southwesterly wind shear on the system.
According to scatterometer data and satellite estimates, the depression strengthened into Tropical Storm Andres six hours later, becoming the earliest named storm in the Northeast Pacific (east of 140°W) on record in the satellite era, breaking the previous record of Tropical Storm Adrian in 2017 by 12 hours.
However, Andres did not have any banding features, and its appearance became more ragged on satellite imagery as it moved into an area with increasingly hostile conditions. Soon afterward, wind shear caused the storm’s circulation to become elongated and its cloud tops to warm. Andres weakened to a tropical depression at 21:00 UTC on May 10 as its center became devoid of convective activity and the remaining thunderstorms were displaced well to the east of the storm’s center of circulation. Andres subsequently degenerated into a remnant low at 15:00 UTC on May 11.
The outer storms of Andres produced heavy rainfall in Southwestern Mexico. Moisture from the storm caused intense rain and even a hailstorm as far east as the State of Mexico, including in the state’s capital, Toluca. Vehicles became stranded in floods, some small trees got knocked over, and about 50 houses were damaged by a flooding river. 30 cars were also stranded in a flooded parking lot of a church in Metepec.