This article is a stub, an article too short to provide more than rudimentary information about a subject. Please help the Dark Tower Wiki by expanding it.
A Starkblast is a severe storm, that in many ways is similar to a freezing derecho. Characterized by severe, sustained straight line winds and extreme cold, the starkblast begins in the polar latitudes of Mid-World. As described in The Wind Through the Keyhole, the starkblast begins as a polar cyclone resulting from a collision between a polar air mass and a much warmer southern air mass, and appears to be channeled and intensified by encountering the path of a Beam, resulting in a narrow swath of focused, devastating winds and fridgid temperatures.
The only areas starkblasts have been described as occurring are along the path of a Beam, once in Gilead(beam of the Horse), once along the beam of the Bear during Roland's telling of the events of The Wind Through the Keyhole, and once during the events of Roland's tale along the beam of the Lion. These are the only described starkblasts although it is implied that there have been more. Starkblasts are preceded by a run of unusually warm weather, followed by a rapid drop in temperature and damaging winds.
They are also associated with unusual billy-bumbler activity, as the animals seem to be able to sense one coming well in advance of the storms actual arrival. Starkblasts are nearly always fatal to those caught outside in them unless magically protected, as they are known to level trees and weaker structures, freeze birds on the wing, and even to freeze dragons. Roland Deschain and his Ka-tet only encounter a starkblast in The Wind Through the Keyhole, but he proceeds to tell them other times when other starkblasts occurred. As result of this terrifying storm, the tet takes refuge in a giant stone building in an unknown town by the River Whye.