This is a multipurpose mushroom cloud explosion. FumeFX for Maya is required to use it.
Short simulation times yield good results, the file is ready for simulation and rendering but changes can also be made through the FumeFX node.
The sample car is included in the rendered images to show scale. All renders were done in Mental Ray except the last image, which is Arnold. Also compatible with other render engines. Basic color correction was done for these images, but is not necessary.