RadarScope is mentioned in 5 weather apps for macOS
Access NEXRAD Level 3 radar data and view information about severe weather warnings. Automatically process the data before displaying it on the screen, display such parameters as reflectivity, velocity, etc. Issue custom warnings regarding the severity of forecasts.
The 4.8.1 version of RadarScope for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The latest version of the program can be downloaded for Mac OS X 10.7 or later. This Mac application is an intellectual property of Base Velocity, LLC. The software lies within Lifestyle Tools, more precisely Weather. The most popular versions of the program are 2.1, 2.0 and 1.3.
From the developer:
RadarScope is a specialized display utility for weather enthusiasts and meteorologists that allows you to view NEXRAD Level 3 radar data and severe weather warnings. It can display the latest reflectivity, velocity, and other radar products from any NEXRAD radar site in the United States, Guam, or Puerto Rico.
You may want to check out more Mac applications, such as Wx, Weather Dock or Living Weather HD, which might be related to RadarScope.