@DougMac2
The weather visualisation along a straight line is available with the Distance & planning feature, in the left Menu of the desktop version, not in the app.
Capture d’écran 2020-03-17 à 09.46.02.png
This tool is also called Route planner as explained here:
https://community.windy.com/topic/9596/how-to-use-a-route-planner
More simply:
Activate Distance & planning
Place 2 points on the map
Select your distance units
Choose your vehicle (Car, or other)
Select North up
Capture d’écran 2020-03-17 à 10.07.50.png