And if you need another reason to avoid flying over the tip of or through the anvil of even "garden variety" cells at high altitude, don't forget about terrestrial lightning-induced gamma ray bursts:
http://www.bbc.com/news/science-environment-30491840
You could have your nuts fried off and not even know it. I am POSITIVE that none of us here are compensated well enough to accept the Mother of All X-Rays to save 5 minutes of weather deviation fuel enroute.
While you are it it, if still on the fence about tankering that extra 1000 pounds of gas before crossing the "Itch" (ITCZ), enjoy this video by NASA explaining how said gamma-ray bursts blow antimatter into space (through your nuts, again):
https://m.youtube.com/watch?v=lXKt7UVjd-I
Can you say, "I'm calling in sick", boys and girls?