Simulated radar reflectivity at 1 km AGL and swaths of 2-5-km updraft helicity (contoured at 150, 300, and 500 m2/s2) from the 1.33-km nest of the WRF simulation, animated between 2200 UTC 3 November and 0900 UTC 4 November 1922. (In Mountain time, 3pm 3 November to 2am 4 November.)