Explosion Algorithm

What appears to be a massive car/truck bomb that has detonated near or on this bridge.

Explosions and gunfire are a normal part of the Baghdad soundscape. I’ve developed an algorithm to help me determine if I should be concerned or not. When relaxing in my room, if an explosion actually rattles the windowpanes then I know that the blast was either way too close or way too big. Anything else, I ignore.