UMass X-Pol on 4 May 2007 Published 12 July 2012 at 424 × 318 in New pub UMass X-Pol on 4 May 2007. Had it not been for the blown tire, we might not have collected data in the Greensburg storm. UMass X-Pol on 4 May 2007. Had it not been for the blown tire, we might not have collected data in the Greensburg storm.