English: Miriam formed as a tropical depression over the eastern Pacific Ocean on September 22, 2012, and strengthened into a tropical storm the same day. Miriam became a Category 3 hurricane on September 24.

At 2:00 p.m. Pacific Daylight Time on September 24, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite acquired this natural-color image. At the same time, the U.S. National Hurricane Center (NHC) reported that Miriam was a Category 3 hurricane located about 405 miles (650 kilometers) southwest of the southern tip of Baja California. The storm had maximum sustained winds of 120 miles (195 kilometers) per hour.

By 8:00 a.m. PDT on September 25, Miriam had weakened slightly. It was a Category 2 hurricane with wind speeds of 100 miles (160 kilometers) per hour. Miriam was moving toward the west-northwest at about 5 miles (7 kilometers) per hour.