The SCU Lightning Complex started on August 16, 2020 and is currently comprised of approximately 20 separate fires within the complex. The complex is broken into three zones; the Deer Zone, Calaveras Zone, and Canyon Zone. The fires continue to burn in steep inaccessible terrain influenced by low Relative Humidity and high day time temperatures. Overnight, crews worked hard to improve and strengthen existing control lines while aggressively attacking fires where accessible. Challenges for firefighters include dangerous rate of spread, medium range spotting and inaccessible terrain combined with triple digit temperatures. An excessive heat warning is in effect until Wednesday August 19th, 2020.