

Located about 425 miles south of Acapulco, Mexico, System 91E is in a good spot for development: warm sea surface temperatures and low wind shear. Those are two factors needed to help a tropical cyclone develop.
Infrared imagery on June 5 at 19:47 UTC (3:47 p.m. EDT/12:47 PDT) from the AIRS instrument that flies aboard NASA's Aqua satellite showed a large area of strong convection and thunderstorms around the low-level circulation center of System 91E.
The National Hurricane Center gives this low a 90 percent chance of development over the next two days, and if it becomes a tropical storm it would get the name Adrian.