@Mike-Schmaltz
Those blue circles show how the thunder (sound) spreads from a lightning.
Like the ripples when you throw a pebble in the water.
Those circles are "increasing in size" with the speed of sound in the air (approx. 1100ft/sec) and fade out after 10 to 20 miles (normally no thunder heard so far away).
@Mike-Schmaltz
To get the detailed color scale, in Settings go to Customize color scale, at bottom of the list. You’ll find the default color scale setting.
[image: 1741973244326-2de8fc64-8055-4118-8cec-426d9f5406e5-resized.jpeg]
