Several attempts were made to establish a similar characteristic that could be used to forewarn the occurrence of the final CG in this storm type. Based on the average radar characteristics during the last CG flash in each thunderstorm case, CG activity comes to an end when the 45-dBZ echo falls below the -10°C isotherm.
Detection efficiencies that remain slightly less than perfect for each network may have allowed for some error when analyzing VHF sources and ground flashes for each convective case. Exhibiting this possible error were Cases 8, 9, 10, and 29. They actually recorded a greater number of CG flashes than intracloud flashes, which is contrary to typical lightning characteristics (MacGorman and Rust 1998, p. 190).
Future studies hope to increase the number of thunderstorm cases to analyze as the LDAR network continues to observe more lightning events. Also, similar approaches could be implemented in differing geographic regions of the country to observe if these lightning characteristics vary depending on latitude, longitude, or climate.
Supplementary URL: http://www.met.tamu.edu/ciams/ldar/index.html