"
Had only she and Richard survived?"
In giving a list of people including yourself, you put yourself last. Since this is done from the female character's point of view, it should be "Richard and she." Even that is pretty clumsy-- maybe time for a "thought bubble"-- "
Have only Richard and I survived?" depending on if you are using that convention.
"
With the wind howling, dust shifting, debris flying, she could barely make out his form."
Seems a pretty passive description of a dynamic scene. And wind-- howling or not-- doesn't obscure your view. "She could barely make out his form through the flying dust and debris."
"
Grasping onto a tree"
Onto means "on top of", not "clinging to." And "grasping" means "holding with your hands." I doubt that you mean that she is on top of a limb squeezing it between her hands. You probably mean that she is "clinging to a tree"-- desperately holding on for dear life with both arms (and maybe legs, too.)
"
but no sound could be heard against the tumultuous chaos surrounding them."
Now is where the "howling wind" would come in. But I'd use "over", not "against." And "tumult" and "chaos" mean pretty much the same thing. Redundant.
There is a scene from the TV series
Growing Pains (go figure) that has stuck with me for all the years after I watched it. The elder daughter has written an essay filled with excessively long, flowery words to the point of making the paper far less readable than if it had been simpler language. I had to google to find the quoted text:
Maggie: (reading Carol's article) Listen to this:
"Night obduces the isthmus 'neath its obsidian mantle. The mollusks imbibe one last sip twixt their valves and expel the day's muculence."
Jason: She could be pushing a little.
Maggie: Jason, read this.
Jason: "With dexterous manipulation of his digits, the master clammer extricates the muculent mollusk from its lapideous ménage."
But the exact words of her teacher are what have stuck with me for decades: he told her that her paper was "
replete with stinkiosity."
Always, writers should ask themselves "Is this replete with stinkiosity?"
"
Richard, yanked back and forth by the wind, his body, rocking violently from the tiny pieces of rubble relentlessly smashing into him."
Sentence fragment.
"
They were only just beginning to regain consciousness from their drug induced slumber, and now they had to contend with this."
Question mark, not period.