I like this!
Don't let the others curtail your creative flare, the intro is good.
As the others above have pointed out, I think you should portray the spiders as an equally plausible solution rather than the correct explanation.
A metaphysical malevolent creature always seems to go down a treat on these pages; and the first explanation is rather interesting, perhaps that's why the spider explanation (though clever) doesn't have the same impact when it comes after the living storm idea.
Keep up the good work.