US Weather Research Program (USWRP) and
NOAA/NEXRAD Radar Operations Center (ROC)
This Mesoscale Convective System (MCS) lasted about 24 hours from 1800 UTC on June 22 to 1800 UTC on June 23 in 1998.
Early afternoon convection on June 22 developed in three preferred locations, northern Wyoming near the higher terrain surrounding Devil's Tower, southern Wyoming north of the Cheyenne ridge, and in central Colorado along the northern side of the Palmer Ridge. There is a clear connection between these higher terrain features and the development of early convection. These areas of early convection eventually organized into a much larger MCS as they moved into Nebraska and southern South Dakota. The entire system dissipated farther eastward over Minnesota and Iowa. The development of early convection along the high terrain that extends eastward from the Rockies was likely organized by jet stream dynamics as it developed below the upper level jet axis.
Above each two-dimensional swath image is a histogram that represents the NS-averaged value of RainRate (mm/hr) within a series of narrow (0.25 deg wide) longitude strips.