Abstract: The goal of this study is to determine whether cumulus convection plays a role in the development of extratropical cyclones, and if it does, to determine the nature of that role. The basic approach is to ascertain whether ...

Abstract: This paper addresses that aspect of predictability which appears related to scale interaction processes in blocking. The basic approach consists of synoptic analysis and quasi-geostrophic diagnosis of the dynamical processes ...

Abstract: Verification scores are presented to illustrate the general success of NMC forecasters in providing the best day 3,4, and 5 mean sea level pressure and 6?10-day mean 500-mb height fields given the operationally available ...

Abstract: On 7 December 1992 NMC began operational ensemble prediction. The ensemble configuration provides 14 independent forecasts every day, verifying on days 1 through 10. The ensemble members are generated through a combination ...

Abstract: Numerical forecasts from a pilot program on short-range ensemble forecasting at the National Centers for Environmental Prediction are examined. The ensemble consists of 10 forecasts made using the 80-km Eta Model and 5 ...

Abstract: Early results are presented of an experimental program in Dynamical Extended Range Forecasting at the National Meteorological Center. The primary objective of this program is to assess the feasibility of extending operational ...