Experiences with a 1.5km version of the Met Office Unified Model for short range forecasting
The UK 1.5km model is a variable resolution model with 1.5km gridlength over the UK but increasing to 4km at the edges of the domain. This enables us to push the boundaries of the model further away from the area of interest at lower cost and also to reduce the resolution mismatch with the driving (12km) model. Comparison of results from the variable resolution domain with those from an equivalent set of nested fixed resolution models will be shown.
Finally some of the future plans for the model will be mentioned including potential physics changes and the possibility of obtaining probabalistic forecasts by running a small ensemble of 1.5km models.