It’s a busy day in North Alabama with NASA and NOAA aircraft in the region supporting a field campaign for GOES-16. Another instrument supporting activities is the North Alabama Lightning Mapping Array (NALMA), which observes total lightning (both intra-cloud and cloud-to-ground). SPoRT has been providing NALMA data to local forecast offices for 14 years and has used these data to serve as a proxy for the Geostationary Lightning Mapper on GOES-16 as part of the GOES-R Proving Ground. The images below show the total lightning activity across southern Tennessee and northern Alabama at 2138 and 2152 UTC on 22 April 2017. The main storm of interest is right along the Alabama-Tennessee border, just north of Huntsville, Alabama. The maximum number of flashes per 2 square kilometers in two minutes is about 50 flashes at 2138. In 14 minutes, that has jumped to nearly 150 flashes over two minutes highlighting a lightning jump. A long flash extending to the south towards Huntsville is also seen. This storm already had a severe thunderstorm warning active and the jump here indicates that the storm will maintain it’s intensity. The weather community will look forward to the Geostationary Lightning Mapper observations when they a made available in the next few months.