Because of the cloudy weather.
Kokura
The Enola Gay wasn't the atomic bomb. That honor goes to Little Boy and Fat Man. The Enola Gay was the plane specially created to drop the atomic bombs :)
The Enola Gay dropped the first atomic bomb.
Enola Gay
Enola Gay
The bomb that the Enola Gay dropped was the Little Boy
The First Atomic Bomb
Enola Gay
the committee of scientists and Army Air Force officers listed Kokura Arsenal, Hiroshima, Niigata, and Kyoto as the four best targets. After the sudies the enola Gay, dropped the first bomb at 2.45 local time over the city of Hiroshima. I posted in the related links box below a link with the damages of the atomic bomb as side reading.
There were two, the Enola gay and the Bockscar.
The Enola Gay.
Enola Gay