Thermal radiation damage depends very strongly on weather conditions. Note where roadway is burned and the ghostly shadow imprints left where the surface was shielded by cement pillars. Bridge across the Ota river, 880 meters from the hypocenter of the bomb burst above Hiroshima. Smoldering material from the thermal pulse can be very effective at igniting leaking gas. The primary ignition sources appear to be flames and pilot lights in heating appliances (furnaces, water heaters, stoves, etc.). The blast reduces many structures to piles of kindling, the many gaps opened in roofs and walls act as chimneys, gas lines are broken open, storage tanks for flammable materials are ruptured. Collapsed structures are much more vulnerable to fire than intact ones. The major incendiary effect of nuclear explosions is caused by the blast wave. Effects of the thermal pulse on clothing. However, smoldering material can reignite later. The incendiary effect of the thermal pulse is also substantially affected by the later arrival of the blast wave, which usually blows out any flames that have already been kindled. The energy from the thermal pulse can initiate fires in dry, flammable materials, such as dry leaves, grass, old newspaper, thin dark flammable fabrics, etc. The first is quite short, and carries only about 1 percent of the energy the second pulse is more significant and is of longer duration (up to 20 seconds). This energy is emitted from the fireball in two pulses. One of the important differences between a nuclear and conventional weapon is the large proportion of a nuclear explosion's energy that is released in the form of thermal energy.
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