https://phys.org/news/2018-06-nasa-formation-tropical-storm-aletta.html

By 11 a.m. EDT on June 5, the low pressure area had organized into a tropical depression. Six hours later at 5 a.m. EDT on June 6, tropical depression 1E strengthened into Tropical Storm Aletta, the first of the Eastern Pacific Ocean hurricane season.

The National Hurricane Center noted "At 5 a.m. EDT (0900 UTC), the center of Tropical Storm Aletta was located near latitude 14.1 north, longitude 106.5 west. That's about 370 miles (595 km) south-southwest of Manzanillo, Mexico. The estimated minimum central pressure is 1000 millibars.