Concordia Regio time evolution. ISS has generally fine spatial-resolution coverage of Concordia Regio that first revealed the extensive surface darkening in the wake of the 2010 September 27 cloudburst event . The 2010 October 29 observation in particular was investigated in detail by Turtle et al. 2011 . Although temporal-resolution coverage of the area is coarser than for Yalaing Terra and Hetpet Regio, the high signal-to-noise and fine spatial resolution of these views reveal what may be areas of surface ponding only tens of km across surrounded by brightened terrain (2011 April 20).