Exploring the use of stability fields from a three dimensional objective analysis scheme in the NCAR AutoNowcaster
One of the recommendations made by the NWS meteorologists is to substitute the Storm Prediction Center's meso-analysis stability parameters for the RUC stability fields currently used by the ANC. The NWS meteorologist have high praise for the performance of SPC meso-analysis fields and use them very frequently when examining potential for convection initiation. The SPC meso-analysis grids are objective analyses calculated from observations using a short term forecast from the RUC as a first guess. Stability fields are calculated using the objective analysis and virtual soundings extracted from the RUC at model grid points.
This paper will present results from re-running the AutoNowcaster with SPC meso-analysis fields for selected of cases from spring and summer 2010. Qualitative and quantitative comparison of nowcast performance using RUC and SPC meso-analysis stability fields will be presented and discussed.