A manual analysis was performed to create ‘cloud objects' for severe thunderstorms in each GOES imager scan for 14 convective days, including 60 severe thunderstorms. (A severe thunderstorm in this case, requires at least one surface severe weather report.) A cloud object in this study is defined as a contiguous group of satellite pixels belonging to a developing/mature severe thunderstorm. The cloud objects are assigned unique, consistent IDs allowing for each storm to be tracked through space and time. The cloud objects are used as input into a UW-CIMSS developed framework to calculate temporal trends of various microphysical parameters such as cloud top phase, cloud particle effective radius, and cloud visible cloud optical depth for each severe thunderstorm. Ongoing work is determining what satellite-derived signatures exist that may offer increased lead-time to surface severe weather reports and/or weakening/decay of severe thunderstorms. This poster will present preliminary results.