Radar measure is related to distance, since the angle changes the farther you are. See e.g. this image
Ref is not "Radar Reflectivity in km", the units are [dBZ](https://en.wikipedia.org/wiki/DBZ_(meteorology).
Expected is the expected amount of rain recorded by the gauge in the last hour in mm. There are a significant number of records that are out of bounds (>69mm)
test records without a Ref measure are no longer counted toward score, but must still be predicted.