It happens. Just gently straighten each stalk up as much as possible and mound up the soil around the base. Watch out for the roots while mounding the soil. Within a couple of days they will stabilize.

Dave

I almost lost corn to a storm too, mine was a little shorter than yours but I propped it back up with mud. I then sidedressed with the following day since it needed done anyways.

Corn after storm 6/18/2009
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3 days later
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Standing tall 6/29/09
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Harvest of the earlier corn 7/28/09
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I quit growing corn awhile back. It was just too much work for me. I would plant it in furrows and then hill it up, and it would still fall over in the wind. One time it was just about on the ground, so we put in some metal stakes on the ends of the rows, and used thick twine to hold the rows up. That worked okay.
I believe they will continue to ripen, even if you leave them laying.

Every gardener who grows sweet corn has had to stand it back up after a storm.

Its helpful to have two people working, one to stand it up and the other to pack dirt around the roots.

If left lying its apt to rot where its in contact with the ground.

That photo looks oh so familiar for me. Happens every year. Every time it happens, I am out in the middle of it packing dirt in a mound around the bases of each plant too. This year, it happened & I did the mound thing after a hard rain. It didn`t rain again for several days & was good & hot to dry out the mound work I had done to each plant. For the most part, I didn`t have to do it again after that episode for the rest of the season. That really made me happy. Was a first.