Simplify the following text for a Grade 4 native English-speaking person.
Original: It executed a tight counterclockwise loop , and continued to mature ; on October 16 it reached peaked winds of 150 mph ( 240 km\/h ) with a minimum barometric pressure of 924 mbar ( hPa ; 27.29 inHg ) .
Simplified: It then moved in a small circle , and on October 16 , it reached its highest power . It had winds of 150 mph ( 240 km\/h ) .