Please see our new publication by our collaborators and us in Atmospheric Chemistry and Physics on the precipitation by polar supercooled clouds:

The prevalence of precipitation from polar supercooled clouds by Israel Silber, Ann M. Fridlind , Johannes Verlinde, Andrew S. Ackerman , Grégory V. Cesana, and Daniel A. Knopf,  Atmos. Chem. Phys., 21, 3949–3971, 2021. Go to publisher.