Assign the correct development stage to the following three upper-level lows.
IR10.8 μm: 16 August 2021 at 00:00 UTC
IR10.8 μm: 8 September 2021 at 06:00 UTC
IR10.8 μm: 14 September 2021 at 06:00 UTC
Excercise 3
See the following vertical cross section of an ULL from 22 September 2021 at 15:00 UTC. Click on the tropopause depression (that is, where the tropopause is lowest) and on the cold core of this system in the VCS plot.
Solution: The upper box is the tropopause depression and the lower box is the cold core of the system.