There is a circular rain feature that is permanently shown in the weather radar for NSW, Australia. Not sure what causes this. It is not present on the BOM or other rain displays

I'd be interested in knowing what causes it to display.

Re: Pressure Icolines

Pressure isolines are important to understanding weather & rain patterns; especially in Australia where they are strongly influenced by Antarctic lows. Is there a technical reason why you have to re- select them every time you open Windy,?