(b) Four-dimensional (4D) distance minimization at each reference point to select convective outflow boundaries for analysis. (a) Construction of a reference grid in proximity to a verifying bore observation. Neighborhood verification of the ensemble bore forecasts. ![]() Finally, the 1-km ensemble analyses at 0300 UTC are used to launch 6-h ensemble forecasts in order to evaluate the PECAN data impacts. During this period, assimilation frequency is reduced to 10 min and the conventional observations are complemented by radar and PECAN IOP20 data. Conventional (NDAS) observations are then assimilated every 3 h until 0000 UTC, at which point the data assimilation calculations switch to the highest-resolution (d03) domain for another 3 h. Based on initial and lateral boundary conditions from GEFS/SREF, a 40-member ensemble forecast is run between 12 UTC to provide the ensemble background for the first data assimilation cycle on the outer 9-km (d01) domain. ![]() (b) Timeline of the data assimilation cycling and ensemble free forecasts. ![]() Each model domain consists of 50 model levels distributed according to the default WRF settings. The horizontal grid spacing of domains d01, d02, and d03 is 9, 3, and 1 km, respectively. (a) Model domains used for the numerical experiments in this study.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |