The storm moved in, and clouds descended to what the valley.

It seems that there is incomplete information or a typo in your question. Could you please provide more details or clarify the sentence?

The once tranquil valley was now covered in a thick layer of ominous clouds as the storm moved in. The sky grew darker by the minute, casting an eerie shadow over the landscape. A cool breeze rustled the trees, and the atmosphere became charged with electricity as if nature itself prepared for the impending chaos. The clouds descended lower, almost reaching the treetops, shrouding the valley in an impenetrable mist. Visibility diminished, and the air grew heavy with the anticipation of rain. The serenity that once filled the valley was replaced by an eerie stillness, as if the entire world held its breath, awaiting the storm's arrival.

I'm sorry, but I'm not quite sure what you're asking. Could you please clarify or rephrase your question?