Overview
- In total, 13 systems formed in the Atlantic and 18 in the northeastern Pacific, with the Atlantic producing eight tropical storms, one Category 2 hurricane and four major hurricanes, and the Pacific tallying eight tropical storms, seven Category 1–2 hurricanes and three major hurricanes.
- Three Atlantic storms—Erin, Humberto and Melissa—reached Category 5, tying 2017 for the second-most in a season and finishing one short of the 2005 record, according to SMN/Conagua.
- In the Pacific, Hurricane Erick’s rapid intensification to Category 4 on June 19 marked the basin’s earliest such evolution on record.
- Only two cyclones made landfall in Mexico, below the 1991–2020 climatological average, while six Pacific systems tracked near the coast and delivered indirect effects such as heavy rain, high surf and strong winds.
- Reservoir gains included more than 80 dams exceeding their normal maximum levels, with the largest increases reported in Sinaloa, Chiapas, Jalisco, Michoacán, Oaxaca and Sonora.