Radar shows signal with no precipitation

[jasons47]

Hello,

Why does the radar sometimes show a signal even though there is absolutely zero precipitation evident outside?

Thanks

[Gkikas LGPZ]

@jasons47

15dBZ equals (aprox.) 0.01 inches of rain per hour ... almost nothing!

Please read https://community.windy.com/topic/14057/how-to-convert-the-information-in-dbz-to-millimeters?_=1677921346571

In general ....

Finally ... wx radars may interfere with sea, dust, swarms of insects !!! , virga (rain that evaporates before it hits the ground) etc
https://blog.metservice.com/Radar_Interference

[jasons47]

@Gkikas-LGPZ Very helpful, thank you! I did not discern anything outside but perhaps the mist did not quite make it to ground level as in a case of virga.