sentences:  Shortly after, the JTWC upgraded Kamba to a Category 4 equivalent cyclone with winds of 215 km/h (135 mph 1-minute winds).By March 11, Kamba began to move over cooler waters and into an area of higher wind shear, causing the storm to deteriorate.About 24 hours after reaching peak intensity, the storm began to undergo an extratropical transition and weakened to a tropical cyclone.