@article{27,
  keywords = {global-to-regional model, cfvGFS, convection},
  author = {Lucas Harris and Shannon Rees and Matthew Morin and Linjiong Zhou and William Stern},
  title = {Explicit prediction of continental convection in a skillful variable-resolution global model},
  abstract = { <p>We present a new global-to-regional model, cfvGFS, able to explicitly (without parameterization) represent convection over part of the earth. This model couples the Geophysical Fluid Dynamics Laboratory Finite-Volume Cubed-Sphere Dynamical Core (FV3) to the Global Forecast System (GFS) physics and initial conditions, augmented with a six-category microphysics and a modified planetary boundary layer scheme. We examine the characteristics of cfvGFS on a 3-km continental United States domain nested within a 13-km global model. The nested cfvGFS still has good hemispheric skill comparable to or better than the operational GFS, while supercell thunderstorms, squall lines, and derechos are explicitly-represented over the refined region. In particular, cfvGFS has excellent representations of fine-scale updraft helicity fields, an important proxy for severe weather forecasting. Precipitation biases are found to be smaller than in uniform-resolution global models and competitive with operational regional models; the 3-km domain also improves upon the global models in 2-m temperature and humidity skill. We discuss further development of cfvGFS and the prospects for a unified global-to-regional prediction system.</p>
 },
  year = {2019},
  journal = {Journal of Advances in Modeling Earth Systems},
  volume = {11},
  pages = {1847-1869},
  month = {June 2019},
  doi = {10.1029/2018MS001542},
  language = {eng},
}