@hamburger,
Udall, KS
May 25, 1955
The climax of several days of tornadic and severe thunderstorm activity late in May 1955 occurred on the night of Wednesday, May 25th. A tornado struck at Blackwell, Oklahoma, killing 20 and injuring 250 with property damage in the millions.
About an hour later a tornado struck Udall, Kansas, some 40 miles north-northeast of Blackwell. The tornado traveled in a general southwest to northeast direction across the center of town. Most of this south-central Kansas town of about 500 people was leveled. The death toll stands at 80 at this writing, and 250 were injured.
http://www.crh.noaa.gov/ict/udall/udall.php