A few South Dakota convective failure modes:

700mb thermal ridge/capping suppresses convective development.

One elevated supercell is on the cool side of a warm front.

Limited low-level instability.

Generally unfavorable low-level lapse rates.

Seems fitting for 2020. #sdwx pic.twitter.com/IZ6tVeh6Hk

— Quincy Vagell (@stormchaserQ) June 6, 2020