UMass X-Pol on 4 May 2007 Published on 12 July 2012 in New pubFull resolution (424 × 318) ← Previous 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.