1. NC STATE UNIVERSITY Matthew D. Parker North Carolina State Univ. Raleigh, NC CSTAR workshop: High-shear, low-CAPE (“HSLC”) tornadoes/sig. severe introduction tornadoes/sig. severe introduction 16 November 2012

2. individual report influence - 160 km radius Mean Tornado Environment: ML CAPE & 0-6 km Shear 2004-2005: 3277 tornado reports | 344 tornado days Max MLCAPE Over Plains Lower MLCAPE and Stronger Shear courtesy: Steve Weiss ML CAPE (J/kg, color fill), 0-6 km Shear (kt, blue barbs) (year=2004-2005, month=ALL)

3. ML CAPE ≥ 2000 J kg -1 | 0-6 km Shear ≥ 35 kt | ML CIN ≥ - 100 J kg -1 Integrated 2003 - 2006 “environment hours” High CAPE; Strong Shear; Moderate CIN Integrated 2003 - 2006 “environment hours” High CAPE; High Shear; Moderate CIN Max 240 hr or 60 hr/yr courtesy: Steve Weiss

4. ML CAPE ≤ 1000 J kg -1 | 0-6 km Shear ≥ 35 kt | 0-1 km Shear ≥ 20 kt ML LCL ≤ 1000 m | ML CIN ≥ - 100 J kg -1 Integrated 2003 - 2006 “environment hours” Low CAPE; High Shear; Low LCL; Mod. CIN Max 480 hr or 120 hr/yr courtesy: Steve Weiss

5. High CAPE | Strong Shear Low CAPE | Strong Shear 26% of F2+ tornadoes local axis 30-60 hr/year 22% of F2+ tornadoes widespread 80-120 hr/year 48% of all F2+ tornadoes courtesy: Steve Weiss

6. Basic parameters: Monthly conference calls for planning, O2R/R2O, etc.Monthly conference calls for planning, O2R/R2O, etc. By consensus, HSLC is considered to be: 0-6 km shear > 35 kts and SBCAPE 35 kts and SBCAPE < 500 J.kg By consensus, landfalling TC cases are omittedBy consensus, landfalling TC cases are omitted Initial “training dataset” of regional cases identified by NWS collaboratorsInitial “training dataset” of regional cases identified by NWS collaborators  Baseline for radar and parameter studies  Best events singled out for detailed NWS case studies Additional data from SPC to supplement our workAdditional data from SPC to supplement our work  Mesoanalysis data for detailed case studies (delivered online for use in Google Earth)  Relational database for all reports (not just the collaborator-identified cases)

7. Specific aims (end products): Quantification of significant differences in ingredients for events vs. nulls; a new composite parameter idealized for HSLC (Sherburn lead)Quantification of significant differences in ingredients for events vs. nulls; a new composite parameter idealized for HSLC (Sherburn lead) Statistical assessment of radar signatures (convective mode, trackable mesovortices, other signatures like broken-S) associated with events vs. nulls (Davis lead)Statistical assessment of radar signatures (convective mode, trackable mesovortices, other signatures like broken-S) associated with events vs. nulls (Davis lead) Stats for groupings of interest: day vs. night, summer vs. winter, near vs. far from radar, S.E. U.S. vs. other regions, etc. (both projects)Stats for groupings of interest: day vs. night, summer vs. winter, near vs. far from radar, S.E. U.S. vs. other regions, etc. (both projects) A population of thorough case studies (events and nulls) whose environments and radar signatures will be compared to (and motivate) the longitudinal environmental and radar statistics (Moore, Lane, Coleman team leaders)A population of thorough case studies (events and nulls) whose environments and radar signatures will be compared to (and motivate) the longitudinal environmental and radar statistics (Moore, Lane, Coleman team leaders)