Synoptic Influence on High Shear, Low CAPE Convective Events
The first HSLC case is a severe quasi-linear convective system (QLCS) that occurred during overnight hours on January 29-30, 2013 in Tennessee and southern Kentucky. The second HSLC case exhibited scattered convection containing several severe mini-supercells on February 10, 2013 in Mississippi. The QLCS was well simulated with the WRF-ARW using reanalysis data. It is evident that the pre-convective environment was destabilized and moistened over time, possibly by synoptic scale lifting. A HSLC profile from this pre-convective environment was then initialized in an idealized simulation using CM1. These profiles were rather dry aloft, and exhibited potential instability. In the idealized runs, convection only developed when a significant wedge-shaped cold slab was used, implying that the environment would not support convection without additional broad lifting (and the possible release of the potential instability). Further analysis, and work pertaining to the mini-supercell outbreak, is ongoing and will be detailed at the conference.