fortunately, the warning system worked. take offs and landings were headlight halted and there was no airplane crash like there would have been before the micro burst warning system was in effect. gregg: now let s move to hurricanes and obviously the most costly and among the deadliest was katrina. could have been a lot worse absent warnings? no question. i believe, based on my research, that the warning system saved about 20,000 lives in katrina. in fact, just a few months before hurricane katrina, was a exercise of emergency officials called the hurricane pam exercise, and they planned for 40,000 deaths around new orleans in the event of an unwarranted hurricane. now, of course, katrina was very well warned by meteorologists and so we believe we saved 20,000 lives. most of the people who lost their lives in katrina lost it in the aftermath when emergency