We apply the breeding method to high-resolution WRF-ARW forecasts covering Vermont and New Hampshire. The forecast duration is currently 48 hours (after the spin-up period), and the configuration consists of three domains (9/3/1-km horizontal resolution); so it is important to understand the effects of the high-resolution nests on the regional instability. During the spin-up period, we apply 3D variational assimilation using WRFDA and conventional observations to generate a new analysis for each domain every 3 hours. These analyses are used to create the new perturbations at each breeding interval.
The breeding method is the first step in understanding and utilizing ensembles and determining what is feasible from an operational perspective at high resolution. We will present the breeding results obtained thus far, challenges, and future work, which includes the utilization of the Localized Ensemble Transform Kalman Filter (LETKF) for data assimilation.