Worse Palomares crash

Something which interested me almost as soon as I saw the map is this situation here, from the Historia de Espana in which the damage from a complete nuclear detonation of the bombs involved in the 1966 Palomares crash in hypothesised. Assuming this is roughly accurate (with the outer circle(s) probably affected somewhat by winds), what is the outcome of the US accidentally wiping out half of Spain and parts of France, Portugal and North Africa?

Those were four B-28 gravity bombs, each with a 1 MT physics package. And it wasn't possible for the bombs to detonate, as they had not been armed. SAC never flew with armed weapons: the bombs could only be armed by receiving the appropriate Emergency Action Message and entering the codes

Even if all four detonate, that's a Four-MT explosion, and most of the damage should be limited to that area of the coast. Go to this site and plot the yield:
http://nuclearsecrecy.com/nukemap/ Then there's the fact that it's an airburst, which minimizes fallout....