My hardcore lightnings and electricity physics passion has successfully imbodied into this brutal gal. Long and gloomy, just as her owner >:)

Quick explanation note:
In my Equestria alteration thunderstorms are not something completely subservient to pegasi, nor lightnings are a factory producable resource. But rather a compulsory measure.

Remember how easily clouds can "absorb" pegasi emotions? I took that idea and scaled it up to the whole Cloudsdale, which is basically a giant condensator in such terms. Now imagine how much of energy produces a whole city of creatures, cheering, enraging or grieving every minute. Hence a whole group of jobs was established just for this loud and fearsome cause of regular Cloud discharge.

If executed in time, it doesn't bring any trouble to winged citizens, but still is very hazardous for earth ones, what Tess faced firsthoof. And that's exactly what Storm Walkers patrol duty is — to study impacts of this phenomenon and protect overland towns from it.
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Wanted to bring some depth into weather production, cause I really love complicating cute ponies world