Tsar Bomba fireball heat pulse burnt paint off of delivery plane and was only 50 Mt. Fire storm will occur everywhere line-of-sight for 100 Mt.
https://www.ctbto.org/specials/testing-times/30-october-1961-the-tsar-bomba
I thought the Tsar Bomb was 100 MT - but I see the Reds purposely reduced its yield by half ... Oh, and I use that map often - usually right after the O-Hole makes another speech against guns.