Diamond Shaped Dotted Lines Around Strikes -- This is the Thunderstorm Ranging and Acquisition (TRAC) Target feature. It displays probable thunderstorm location and tracks their movement, while analyzing storm trends and characteristics. This is accomplished by correlating the number and timing of closely clustered strikes.
Red Lines Trailing Diamonds -- This is the Storm Groundtracks feature. It plots a red path from a storm's position where it was first detected to the current location.