It was cloudy that day, and pretty soon it started to rain. An occasional shower at first, the showers became heavier this time. And then the sound. The sound was like that of a freight train. This was long before storm warnings, long before radar could have picked up unsettled weather, long before radios could have blared out the news that a tornado was baring down on Marshfield, a small town in southwest Missouri. In minutes the town was destroyed.