NASA's CloudSat satellite captured a slice of Hurricane Karl's clouds at 07:59 UTC (3:59 a.m. EDT) Sept. 17. CloudSat shows clouds are over 8 miles high. The blue areas along the top of the clouds indicate cloud ice. The highest clouds in Karl at the time of the image were as cold as -40 Celsius (-40 Fahrenheit) to -60C (-76 Fahrenheit). That line disappears where there is strong rainfall exceeding 30mm/hr (1.18 inches/hour).