Would a nuke turn the desert into a "sheet of glass"?

[Pushkin]

@DougC

• • • Well this page:
      TRINITITE - PRODUCT OF THE FIRST ATOMIC BOMB BLAST
      shows the trinitite distribution, and you can see it was only a few hundred meters across, for an atomic bomb on the ground. So it obviously takes a lot of heat to melt sand like this.

So what about the Hydrogen Bombs in the Pacific? Were all the islands blown up turned to chunks of glass? Bigger bombs more heat?