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Hi Tom and welcome,
The full name of the parameter is "Simulated Radar Reflectivity". It is generated by the model to forecast what the weather radars will be seeing. The advantage is that there is no loss of signal as the distance increases from the radar - it is an even picture throughout the map.
Reflectivity is a very useful indicator for the existence of active convection and instability of the atmosphere. Values of 45dbz and higher indicate the existence of hail and possible thunderstorm cells. Active cold fronts show up very well with reflectivity. There is often a match between precipitation and reflectivity when the precipitation is due to convection.
Thank you so much for the answer.
I appricate it.
Thank also for your greate work. I'ts so beautifull. Respect!
I hope that one day there will be a distinction between low, medium and high cloud cover.
in the meantime, I greet you from Belgium