I will take it that 40Z is the bottom of the storm.
Frank is affected by the falling ice (23 CL check) and takes 11 bludgeoning plus 7 cold damage. Frank has 70 HP remaining. Note the half movement through the storm, which lasts one full round.
The big boy is not scared (28 CL check; 23 Will save). Note that Frank is still invisible, although he is in Kepé's sensory range. Also note that the storm will be there until the end of Kepé's turn in round 105.