Help NASA scientists look at clouds from above and below!

Held on 9 September 2026, this training webinar helped prepare volunteers for the upcoming PACE Clouds Challenge (15 September–15 October 2026). This session explained how to contribute ground observations to support NASA's PACE satellite mission. Participants learned how to accurately estimate cloud cover percentage, record observations within the critical 5-minute PACE overpass window using the GLOBE Observer app, and review the matched satellite imagery NASA will send back to users. Data collected during the challenge will directly assist NASA scientist Dr. Andy Sayer in evaluating how well PACE measures cloud edges and overall cloud cover.