We were taught that a simple 60 degrees L/R for a certin time to clear obtacle ahead, followed by 60 R/L to parallel track. Then when clear 60 R/L for the same time to regain original track with a 60 L/R and an ammended ETA. They may have then avoided the worst of the weather ahead. It seems this was not attempted and their only cloud avoidance was a vertical one.
Still, easy when on the ground. RIP