I'm guessing its just a matter of creating the range envelope. Euro 3" top end other models 6ish
3-6" is the forecast unless you are CWG then its dusting to 8"
As models begin to converge and then fine tune as we are on the doorstep it sure does scream how we should view model runs a week out...
That said it's pretty awesome how the models can see that an event may happen from so far out.