Brown spots on map just before cloud forming

[tomasbona]

 Hi, I´m new here. Could any one help me what the brown spots (with lightnings) mean on a map just before some clouds form?
It´s seen in Radar-Satelite mode under Meteoradar.

 image url)

[idefix37]

@tomasbona
See
https://community.windy.com/topic/8978/legend?_=1626759092573
https://community.windy.com/topic/15910/lightining-map?_=1626759092583

[Mozellshade]

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