A depression formed from an area of disturbed weather on August 17. The depression organized into a tropical storm 12 hours later. Ignacio's location of tropical cyclogenesis was farther north and west of where most East Pacific tropical cyclones form. Steering currents pulled Ignacio north, where it encountered wind shear and cooler waters. Ignacio lost tropical characteristics August 19. The extratropical cyclone was absorbed by Gulermeno and another extratropical cyclone.