Assessing the Skill of Next Day Convection-Allowing WRF Forecasts of Convection Initiating on Outflow Boundaries
This study evaluates next day forecasts from 4 different convection-allowing configurations of the Weather Research and Forecast Model (WRF) in cases in which convection initiated on a residual outflow boundary. Forecasts from the National Severe Storms Laboratory (NSSL) 4 km WRF, the National Center for Environmental Prediction (NCEP) Hires Window 4 km WRF-Advanced Research WRF (ARW) and 4 km WRF-Nonhydrostatic Mesoscale Model (NMM) and the NCEP Experimental 4 km WRF-NMM for SPC are evaluated over 60 such cases from the convective seasons of 2011-2013. Objective verification techniques are employed comparing model 1 hour precipitation forecasts to NCEP Stage IV hourly precipitation analyses. It is expected that results will show that model convective forecasts in these cases are less skillful than cases which do not contain outflow boundaries. Reasons for these deficiencies, including the effects of physics parameterization schemes, will be investigated.