 The storm quickly strengthened; six hours after Isis became a tropical storm it reached winds of 70 mph (115 km/h).Very deep, symmetrical convection developed over the poorly defined center of circulation while banding features began to form, although ill-defined outflow and land interaction with the Baja California Peninsula initially prevented further strengthening.At 1200 UTC on September 2, Isis made landfall on extreme southeastern Baja California Sur as a strong tropical storm, and subsequently turned to the north-northeast.