NSSL product captures rotation tracks Posted in Perspectives, Photo of the Month on April 27, 2011 by Susan Cobb. NSSL's Rotation Tracks product from WDSS-II On Demand for Arkansas from the tornado outreak on Monday, April 26, 2011. Related Articles:NSSL product captures rotation tracks of April 27…NSSL's Rotation Tracks image of the tornado outbreak…May 2013 Oklahoma tornado experimental warning productsR2O success in BirminghamShare this: