Found this while randomly reading about ammonium nitrate. Holy shit! From the article:
"At 09:12, the ammonium nitrate reached an explosive threshold of 850°F (454°C). The vessel then detonated, causing great destruction and damage throughout the port. The tremendous blast sent a 15-foot (4.5 m) tsunami/tidal wave surging over nearly 100 miles (160 km) of the Texas shoreline, leveled nearly 1,000 buildings on land, and sunk virtually every ship within the harbor. Two airplanes flying in the area were incinerated. A chain reaction caused an explosion on board the High Flyer and ignited refineries on the waterfront, destroying the Monsanto Chemical Company plant and several explosive facilities. Falling bales of burning twine added to the damage while the Grandcamp's anchor was hurled across the city. Sightseeing airplanes flying nearby had their wings sheared off , forcing both out of the sky.10 miles away, people in Galveston were forced to their knees..."