In the summer of 1943, human beings manufactured a tornado of fire 1,500 feet high with winds of 150 miles per hour, tearing through a major European city. This episode opens the historical records, strategy documents, and atmospheric data behind Operation Gomorrah, the Allied bombing of Hamburg, to understand how shifting military doctrine, cold scientific research, and freak weather converged into one of the most devastating events in the history of aerial warfare.

We start with the 1941 Butt Report revealing that only a third of RAF crews dropped bombs within five miles of their targets, the pivot under Arthur Harris to area bombing designed to dehouse factory workers, and the research units that built full-scale models of German rooms to calculate the ideal ratio of high explosives to incendiaries. Then we follow the July raids: the H2S radar that found the Elbe, the Window foil strips that blinded German radar, the creepback that dragged the bombing six miles off target, and the night of July 27 when dry weather, severed phone lines, and absent fire brigades let 2,000 tons of bombs create a self-feeding firestorm that killed an estimated 18,000 people in hours.

• Delayed-action fuses designed to kill firefighters and leave the flames unchecked
• Why the American daylight raid failed and pulled Hamburg’s firefighters away to Hanover
• The physics of the candle under a glass: how a city-sized vacuum created hurricane winds
• Hitler’s panic, 45 percent of fighter squadrons pulled home, and the drained Eastern Front
• Senator McMahon’s 1949 argument that Hamburg erased any moral line before the hydrogen bomb