- A small clear slot hole within a dark rain-free cloud base
- W002871S
- A small clear slot appears as a hole within a dark rain-free cloud base leading up to the rain curtain of this storm. It is formed by dry air downdrafts on the upwind side (aloft) of the lowest part of the updraft base, in part compensating for the rising air currents ahead of it. The bright hole seems out of place in this stormy sky.
-
+