Left-moving Supercells with Polarimetric Data Available, 2011-2022

This is a quality-controlled dataset of left-moving supercell storms that are associated with polarimetric weather radar data collected by the U.S. WSR-88D network. Cases are from 2011-2022, and include a combination of cases from SPC's Storm Modes dataset (Smith et al. 2012) from 2011-2015, and manually-derived cases systematically collected by all of the dataset creators. Mesoanticyclone strength is noted following the Andra (1997) nomogram. Start/end time and lat/lon are specified for each case to ensure good radar data quality. Quality control consists of (i) ensuring that each storm is separated from others; (ii) the storm is within 200 km of a WSR-88D; (iii) updraft rotation is anticyclonic and consistent through time and over depth; (iv) the low-level reflectivity gradient is on the left flank relative to storm motion. From version 1 to version 2, the following changes were made: REMOVED: storms 89, 93, 107, 216, 564, 673, 698 [These were duplicated in the original dataset] REVISED: storm 53 (new end time 0021 UTC; new end lat/lon 34.62/-102.25) [Incorrect storm was tracked in the original dataset]