The special observation data sets assimilated in each of the two study areas includes:
Northern Plains seven 915 MHz wind profiling radars, two 449 MHz wind profiling radars, five sodars, 39 instrumented tall towers, and approximately 400 nacelle anemometers .
Texas three 915 MHz wind profiling radars, seven sodars, and 15 instrumented tall towers .
In this presentation we will describe results from data denial experiments that have been run for limited periods within the WFIP project. The goal of the data denial experiments is to quantitatively document the precise impact that assimilation of the special WFIP data had on model accuracy, by comparing simulations from identical models run with and without the new data. NOAA/NCEP will also conduct data denial experiments with its 12 km North American Mesoscale (NAM) and 4 km NAM CONUS nest. Results from separate data denial runs will be shown for the Northern Plains study area and the Texas study area, including a meteorological analysis of ramp events.