NukeMap is giving me this, if you go with a surface detonation and 10 or so W-88 Trident D5s, about half a megaton each.
I... moved the entire concept south of where you had it, as where you have it is... more or less right in the middle of an extended metro area...

So yeah.
If the wind is blowing to the North East... yeah you've basically just irradiated Dubai, basically most of the UAE, and Northern Oman... like 10 to 15 million people, probably essentially immediately (to within a week) killed a couple tens of thousands, minimum.
So basically... imagine a haboob.
But... its extremely radioactive.
... This is actually an... unimaginably extremely worse scenario than what is depicted in Spec Ops: The Line, which is the only point of reference I can think of.