If the situation ever happens, I wouldn't exactly try to survive depending on the location. The damage will be tremendous and only a few people would have a shelter ready for the occurrence. The heat wave will wipe all living organisms for miles on end and think of mental damage you will go through, especially if you lived in that area for a long time. Nothing will ever be the same and even if you did live through that bit, its going to be survival, which in my eyes is far more interesting in a movie than real life. Death would be a more suitable option.