WAIT, THEN, for the Day when the skies shall bring forth a pall of smoke which will make obvious [the approach of the Last Hour],

Then watch thou for the Day that the sky will bring forth a kind of smoke (or mist) plainly visible,

But watch thou (O Muhammad) for the day when the sky will produce visible smoke

So wait for the day when the heaven brings a clear drought,

Then watch for the Day when the sky will bring a visible smoke.