Original: Katrina again rapidly intensified, attaining Category 5 status on the morning of August 28 and reached its peak strength at 1:00 p.m. CDT that day, with maximum sustained winds of 175 mph (280 km/h) and a minimum central pressure of 902 mbar.
Simplified: Katrina again began to become quickly strengthen, reaching Category 5 strength on the morning of August 28 and reached its strongest point with maximum sustained winds of 175 mph (280 km/h) and a minimum central pressure of 902 mbar.