Model output data for compressible EULAG dynamical core in COSMO: convective-scale Alpine weather forecasts

The archive contains model output data for article "Compressible EULAG dynamical core in COSMO: convective-scale Alpine weather forecasts" to be published in Monthly Weather Review.

The article presents the semi-implicit compressible EULAGas a newdynamical core for convective-scale
numerical weather prediction. The core is implemented within the infrastructure of the
operational model of the Consortium for Small Scale Modeling (COSMO), forming the NWP
COSMO-EULAG model (CE). This regional high-resolution implementation of the dynamical
core complements its global implementation in the Finite-Volume Module of ECMWF’s Integrated
Forecasting System. The paper documents the first operational-like application of the dynamical
core for realistic weather forecasts. After discussing the formulation of the core and its coupling
with the host model, the paper considers several high-resolution prognostic experiments over
complex Alpine orography. Standard verification experiments examine the sensitivity of the CE
forecast to the choice of the advection routine and assess the forecast skills against those of the
default COSMO Runge-Kutta dynamical core at the 2.2 km grid showing a general improvement.
The skills are also compared using satellite observations for a weak-flow convective Alpine weather
case-study, showing favorable results. Additional validation of the new CE framework for partly
convection-resolving forecasts using 1.1 km, 0.55 km, 0.22 km, and 0.1 km grids, designed to
challenge its numerics and test the dynamics-physics coupling, demonstrates its high robustness in
simulating multi-phase flows over complex mountain terrain, with slopes reaching 85 degrees, and
the flow’s realistic representation.