Cities can create their own microclimates with interesting implications for detailed simulations of flow in urban areas (Lundquist and Chan JAMC 2007; Lundquist and Mirocha JAMC 2008), mixing-length heights (Simpson et al. AE 2007), and air pollution events (Hu et al. JAMC 2013), especially when urban meteorology interacts with nocturnal low-level jets (LLJ). Immersed boundary methods may be required for simulations in urban areas (Lundquist, Chow, and Lundquist MWR 2010, 2012).