A colonial storm shutter assembly with improved impact resistance includes shutter blade elements having a corrugated configuration that exhibits superior structural strength and bending resistance while providing an attractive face. Triple, double and single shutter blade elements overlap to provide enhanced structural strength and simplify assembly. Side frame structures include a reinforcing portion on the outside wall which provides increased strength particularly in the miter joint with top and bottom frame structures. A storm bar includes a center storm bar clip which bolts to the side frames of two shutter panels when in the closed configuration to provide enhanced structural rigidity. Center fastening angles are bolted to the side and top/bottom frames at both the top and bottom where the two shutter panels meet in the closed configuration to provide further structural strength and resistance to opening.