The time when the sky (consciousness) is split open with its clouds (the grace that enables the realization of the reality) and the angelic forces (the reality of the Names) become manifest one after another!
Sayyed Abbas Sadr-Ameli
And on the day when the heaven shall burst asunder with the clouds and the angels shall be sent down descending (in ranks)
Al-muntakhab fi tafsir al-Qur'an al-Karim
The Day shall come when the heavens break into fissures and so do the cumulative clouds -which have gathered from the immense explosions and disruption emblematic of the Final Hour- and the angels are sent down in rows and ranks