Residents of Greensburg, Kansas had about 20 minutes warning before one of these destroyed their town in 2007
The 20-minute warning time was reasonable, but the tornado was so ... An 
emergency was declared, and people had 20 minutes to try to save their families' 
lives and to ... these people of Greensburg, Kansas, for their spirit, their bravery, 
... Just very briefly before I yield to my good friend Mr. Skelton, let me... [DOC] [TLE] May 2007 tornado outbreak - Wikipedia [PAR] 1Most severe tornado damage; see Enhanced Fujita scale.