Merge pull request #409 from openclimatefix/issue/370-nwp-float-32

change nwp float32

Author: peterdudfield

nowcasting_dataset/data_sources/nwp/nwp_data_source.py

@@ -130,7 +130,7 @@ def _post_process_example(self, selected_data: xr.Dataset, t0_dt: pd.Timestamp)
 
         selected_data = selected_data.sel(target_time=slice(start_dt, end_dt))
         selected_data = selected_data.rename({"target_time": "time", "variable": "channels"})
-        selected_data.data = selected_data.data.astype(np.float16)
+        selected_data.data = selected_data.data.astype(np.float32)
 
         return selected_data