The tornado moved through Moore like a sluggish lawnmower – with a top speed of 25 m.p.h., it was slower than the usual twister – and that likely contributed to the vast amount of damage it caused. You'll see it creep across the prairie in this satellite time-lapse footage compiled by NASA's Robert Simmon, using images snapped by NOAA's GOES-East satellite. The time window is from 10:45 a.m. to 6:45 p.m. CDT:

This is almost unreal.