The MRMS AzShear product produces multiple areas of rotation as it tries to ingest 0.5 degree SAILS scans. The animated gif above is from WFO TOP late Tuesday afternoon as a tornadic circulation moved north of I-70. The AzShear algorithm easily identifies the area of rotation, however during SAILS cuts it breaks the rotation into multiple areas rather than moving the entire circulation forward with each time step. This may be due to only the lowest scan being available for AzShear during SAILS cuts, but it makes the product look disjointed and unrealistic. While this may be easy to ignore in discrete supercell mode, the AzShear output could be confusing if SAILS were deployed in situations that may have numerous areas of weaker rotation and/or shear zones, such as a QLCS/MCS.

Dave Grohl