Precipitation type - newly added

[stpdgld]

@idefix37 ECMWF and I compared it against a report from the Aviation Weather Center.

[idefix37]

@stpdgld
If you compare Precipitation type layer to observations, there is some chance that ECMWF forecast does not match these observations.
A prediction is not a report.
But this layer and the local forecast by ECMWF are consistent.