风切变
A tropical wave developed into Tropical Depression Five on August 1, while located about 810 miles (1,305 km) east of the Lesser Antilles. Wind shear initially caused the depression to remain weak, though by August 2, it was upgraded to Tropical Storm Ernesto. The next day, Ernesto entered the Caribbean Sea. As the storm approached the western Caribbean on August 5, wind shear and dry air briefly halted strengthening; convection diminished, exposing the low-level circulation, which had become somewhat less defined. After the wind shear and dry air decreased, Ernesto regained deep convection and became a hurricane on August 6. Early on August 8, it made landfall in Costa Maya, Quintana Roo as with winds of . A few hours later, a minimum barometric pressure of 973 mbar (28.7 inHg) was recorded. After weakening to a tropical storm and moving into the Bay of Campeche, the storm struck Coatzacoalcos, Veracruz on August 9. It weakened over Mexico and dissipated on August 10. The remnants contributed to the development of Tropical Storm Hector in the eastern Pacific.