Limited area NWP using the UK MetOffice Portable Unified Model based on version 6.1 with modifications. The forecast domain is located over the Barents Sea. Hirlam12 forecasts are used as lateral boundaries every hour and initial conditions. The model is running routinely at the Norwegian Meteorological Institute but is not an operational model. Horizontal grid spacing is 4km and 38 levels are employed in the vertical. The model is initiated at 12UTC only.