The first two or three seconds, I felt very strongly the heat radiation all over the exposed parts of my body. The part of my retina which was exposed to the indirect light from the surrounding mountains was completely blinded and I could feel traces of the after image 30 minutes after the shock.
The reddish cloud darkened after about 10 or 20 seconds and rose rather rapidly leaving behind a thick stem of dark brown smoke. After this, I remember having seen a white hemisphere rising above the clouds in continuation of the breakthrough of the explosion cloud through the ordinary cloud level.
The path of the shock wave through the clouds was plainly visible as an expanding circle all over the sky where it was covered by clouds.
