This WCC remained in the SGP through 7 July and was responsible for several extreme rainfall events, including the 27-28 June central Texas flood and the 28 June to 1 July southeast Kansas flood. This long-duration WCC was analyzed using surface data, upper-air analyses and sounding data, radar and satellite imagery, and model analyses to determine the causes of the development, evolution, and decay of this unusual event. Results from the analyses indicate that there were several contributing factors leading to the development and strengthening of the WCC. These include a persistently unstable and nearly saturated environment in much of the region as a result of an anomalously wet spring in the SGP and the long-duration transport of very moist and unstable air from the Gulf of Mexico, very weak vertical shear throughout the period, the rapid intensification of a shortwave trough in southern Canada and the northern US from 25-27 June (leading to large-scale ascent near the WCC), repeated periods of convection and subsequent latent heat release near the center of the circulation, and upper-level divergence provided by a strong ridge developing in the southeastern US.
Furthermore, the WCC remained in the SGP for several days as a result of a blocking pattern in much of North America. A deep trough developed in southeastern Canada and the northeastern US, while upper-level anticyclones developed in the northern plains and the southeastern US. The resulting col in the middle Mississippi Valley and a strong western US ridge prevented the WCC from moving away from the SGP. A weakening southeastern ridge and the entrance of a strong upper-level jet streak allowed the WCC to merge with stronger steering flow and exit the region on 7 July.