In Hill et al. (2016), there were errors in the reporting of covariance localization half-widths, both in the horizontal and vertical. The horizontal half-widths were reported as 600 and 300 km and the vertical half-widths were reported as 0.075 and 0.025 km for the outermost and inner domains, respectively. These half-width values of the Gaspari–Cohn localization function (Gaspari and Cohn 1999) come from a Data Assimilation Research Testbed (Anderson et al. 2009) namelist, which was incorrectly interpreted. The horizontal half-widths should have been calculated as the product of the namelist cutoff value (e.g., 0.05) and radius of Earth in kilometers. The vertical localization half-widths should have been calculated as the product of the cutoff value and normalization distance, which in this instance was 10 000 m. Therefore, the horizontal localization half-widths should be 950 and 320 km, and the vertical half-widths 1.5 and 0.5 km, for the outer and nested domains, respectively. These reporting errors were only typographical in nature and in no way impacted the results therein.
REFERENCES
Anderson, J. L., T. Hoar, K. Raeder, H. Liu, N. Collins, R. Torn, and A. Avellano, 2009: The Data Assimilation Research Testbed: A community facility. Bull. Amer. Meteor. Soc., 90, 1283–1296, https://doi.org/10.1175/2009BAMS2618.1.
Gaspari, G., and S. E. Cohn, 1999: Construction of correlation functions in two and three dimensions. Quart. J. Roy. Meteor. Soc., 125, 723–757, https://doi.org/10.1002/qj.49712555417.
Hill, A. J., C. C. Weiss, and B. C. Ancell, 2016: Ensemble sensitivity analysis for mesoscale forecasts of dryline convection initiation. Mon. Wea. Rev., 144, 4161–4182, https://doi.org/10.1175/MWR-D-15-0338.1.
