Thanks for the response. I realize Windy is not your typical weather site, but one common use of weather sites must be to see the current conditions before heading out the door. I will watch for further development along these lines.
You probably refer to the Universal Transverse Mercator (UTM) which is a cylindrical tangent projection but with the axis of the cylinder perpendicular to the North-South axis?
This projection has many disadvantages:
I don't think the behavior you're seeing is that unusual. Many web sites with maps respond in the same way as Windy; two finger scrolling will zoom the map in and out. I agree that Windy seems a bit sensitive to it but other sites are like that as well.
Have you tried there finger dragging? That scrolls the map for me which I assume is what you want to do. If that does not work, you may need to enable 3 finger gestures in the macOS system preferences.
Jet-streams are high speed winds which are observed in the high troposphere.
So in Windy, if you select the Wind layer and move the altitude slider to an altitude corresponding to 300 or 250 hPa, you get a « jetstream layer »
For example today, the ECMWF shows this wind field at 250 hPa. (here with customized colors)
In addition You can display Geopotential isolines.
Click on More layers... in the right menu
Weather radars locate precipitation like droplets of rain, snow or hail.
Lighting strikes are detected by interconnected networks of spaced sensors.
Tornadoes are rotating column of high speed wind below thunderstorm cloud. There is no sensor or device able to detect them. Only an analyse of risk can be done by Meteorological Services.
As shown in this page the signature of a tornadoe is often a hook shape in the radar image. You may try to find it on Windy Radar. But in any case it is better to rely on National Weather Service warnings.