We will hold the Pre-ICMW mini-workshop: Cumulus congestus case 21:00-24:00 UTC, 17th November 2020 (exactly 24 hours after the Pi chamber case). This workshop aims to share and discuss the first results of the ICMW cumulus congestus case among the case participants. We will update the case description and continue the project toward the ICMW Jul 2021.