Hi Grenville,
After conversations with people at the Met Office I’ve realised that the convective rainfall stash is only used for the convection scheme (parametrisation), which is why I’m getting this error.
Despite stash 4203 being labelled as the “large scale rainfall rate” or the “stratiform rainfall rate” (depending on where you look), it is presumably all of the rainfall that is derived from the model when the convection scheme is turned off. I’m under the impression that this stash captures the rainfall from the explicit convection, even if not stratiform(?)
Total rainfall with explicit convection = 4203
Total rainfall with parametrised convection = 5216 = 4203 + 5205
Thanks for getting back to me!
Amethyst