  In this paper I examine snow crystal growth near -14 C in comparison with a
comprehensive model that includes Structure-Dependent Attachment Kinetics
(SDAK). Analyzing a series of ice-growth observations in air, I show that the
data strongly support the model, which stipulates that basal growth is
described by classical terrace nucleation on faceted surfaces in this
temperature region. In contrast, prism growth exhibits a pronounced "SDAK dip"
that substantially reduces the nucleation barrier on narrow prism facets
(relative to that found on broad prism facets). I use these measurements to
further characterize and refine the SDAK model, which effectively explains the
robust formation of platelike snow crystals in air near 14 C.
