Greetings.
The first most important fact to know is that WX radar echoes on WATER IN LIQUID FORM, so wet snow, wet hail, rain, and most important WET WINDSHEAR, this is due to the fact that water molecule will align themselves when excited by microwave.
So where is the water in liquid form in a cloud? below ISO 0 deg, therefore the tilt has to be less than 0, you can use 1 in 60 rule, i.e., 1deg at 60 nm is 1 NM (6070 feet) so how many feet below your CRZ FL is the ISO 0?
baring in mind that WX range is 80 NM and Turbulence is 40 NM range.
