The Multiple-Vortex Structure of the El Reno, Oklahoma, Tornado on 31 May 2013 Bluestein, Howard B. ; Thiem, Kyle J. ; Snyder, Jeffrey C. ; Houser, Jana B. Abstract Publication: Monthly Weather Review Pub Date: August 2018 DOI: 10.1175/MWR-D-18-0073.1 Bibcode: 2018MWRv..146.2483B