Phillip Davis writes:
Hi, just wanted to share a video of my garden which got itself a rain blister as the ground got saturated :) took a shovel to it after the video to let the pressure out, that was strangely satisfying.
Such holes are formed when the water temperature in the clouds is below freezing but the water has not frozen yet due to the lack of ice nucleation. When ice crystals do form it will set off a domino effect, due to the Bergeron process, causing the water droplets around the crystals to evaporate: this leaves a large, often circular, hole in the cloud.
Now for yeh.