It probably released less destructive energy then did the first conventional firebombing of Tokyo - where the mass of rapidly burning ground level wood buildings (firestorm) added so greatly to the effect of the bombing raid that it shouldn't be judged solely on the number of tons of high explosive that were dropped.
And, repeatedly throughout the entire war, huge weather systems applying much destructive (negative and positive) energy over wide areas showed an ability to stop even the largest invasions known in history literally in their (tank) tracks.
One thinks in particular of the threat of unexpectedly wicked storms in the shallow narrow English Channel that so hampered German and Allied invasion plans.
Or of the ability of monsoons to halt even the most sturdy/primitive war making in its (jungle), tracks from India to the western Pacific.
But even very low positive energy weather systems (think of the persistent cloud cover over North West Europe for example) can stymie the most carefully planned 1000 bomber raids.
And the massive negative energy of a stationary Russian cold air mass could stall the world's largest land invasion ever , as it literally seems to suck all the motive energy out of humans and the (heat) engines powering their tanks and trucks.
Another way to regard weather as a source of massive negative energy is to look at the the effect that a complex mixture of relatively moderately unsettled weather could have on Germany's fragile wartime domestic food harvests.
For food is measurable in quite conventional units of heat energy calories and a lack of food energy in Germany's own harvests usually meant people elsewhere by the tens and tens of millions went hungry and many died of huger-related diseases, from the Netherlands to Auschwitz.
So, we talked about carpet bombing a lot during WWII but that is all that it was : talk.
Real carpet bombing is the pelting rain down from a massive monsoon that literally covers an eighth of the entire Earth's surface with a carpet of water.
Unlike today's man-made C02 crisis, Man really did virtually nothing to Mother Nature in WWII : she made all the rules and set all the paces.
The Hiroshima bomb was small potatoes indeed against her powers : only in their Hubris did WWII men approach the size of the 1997 El Nino ...