Tornadogenesis

Lauren Coleman's excellent blog The Copy Cat Effect states that a recent paper on Tornado Climatology has shown that tornadoes have a tendency to touch down in the areas between the city and countryside, the marginal areas where in the US, trailer parks tend to be. These are liminal areas, where the wilderness gives way to the settled world of the city. The suburbs have always had a mysteriousness, where the animal and vegetable world are kept at bay temporarily, leave those pavements unmaintained by council workmen with their weedkiller sprays and in a year or two the place looks like one of those ancient temples in the jungle. Nature clings on to every crevice. These areas have always been associated with Witches, who out of necessity needed to be near nature so as to collect the ingredients for their potions but also needed to be near a populace of customers.
That Tornadoes manifest in liminal areas is of no surprise. They are Daemons.

http://copycateffect.blogspot.co.uk/2014/05/trailers.html

http://journals.ametsoc.org/doi/abs/10.1175/2013EI000548.1