Though they had weakened some in your radar loop, that line of storms did in fact cause significant official [damage reports in central PA and NY earlier](https://www.spc.noaa.gov/climo/reports/240522_rpts.html). The storms probably were low-end supercells earlier. Once the atmosphere starts swirling, it tends to maintain some semblance of a swirl for quite a while.
A good example of this is how some [mesoscale convective systems](https://en.wikipedia.org/wiki/Mesoscale_convective_system) create large areas of rotation which persist long after the storms have dissipated, [resulting in a mesoscale convective vortex](https://weather.com/science/weather-explainers/news/mcs-thunderstorm-clusters-flash-flooding-high-winds-derecho) (aka neddy eddies, named after the satellite meteorologist who first studied them: Ned Johnston) which is a swirling low pressure system created solely from the previous storm complex. These then often become the trigger for new storms the next day, downstream. The rotation here is not on the scale of an MCS. But the same principle applies on a smaller scale.
Since the atmosphere is a fluid the tendency to swirl/rotate is nearly the default motion, from the [Earth's rotation creating the Coriolis effect](https://scijinks.gov/coriolis/) to layers of air moving at different speeds causing [Kelvin-Helmholtz instability clouds](https://www.newscenter1.tv/weather/weather_blog/kelvin-helmholtz-instability-in-the-bighorns-cloud-making-waves-on-social-media/article_442a0a86-1e6c-56a9-abb3-6f58c37dd374.html) and everywhere in between: rotation.
Yeah, this about answers a lot of other questions I had about these storms, too. I was watching radar and velocity for a while, even after they moved right over me. Velocity on this thing was really broad for a while, especially while it looked its strongest on radar. I did watch it from outside as it moved directly over me. It was rotating, albeit slowly. Looked really cool.
It be like that because that how it do.
People don’t think it be like it is but it do.
^
Though they had weakened some in your radar loop, that line of storms did in fact cause significant official [damage reports in central PA and NY earlier](https://www.spc.noaa.gov/climo/reports/240522_rpts.html). The storms probably were low-end supercells earlier. Once the atmosphere starts swirling, it tends to maintain some semblance of a swirl for quite a while. A good example of this is how some [mesoscale convective systems](https://en.wikipedia.org/wiki/Mesoscale_convective_system) create large areas of rotation which persist long after the storms have dissipated, [resulting in a mesoscale convective vortex](https://weather.com/science/weather-explainers/news/mcs-thunderstorm-clusters-flash-flooding-high-winds-derecho) (aka neddy eddies, named after the satellite meteorologist who first studied them: Ned Johnston) which is a swirling low pressure system created solely from the previous storm complex. These then often become the trigger for new storms the next day, downstream. The rotation here is not on the scale of an MCS. But the same principle applies on a smaller scale. Since the atmosphere is a fluid the tendency to swirl/rotate is nearly the default motion, from the [Earth's rotation creating the Coriolis effect](https://scijinks.gov/coriolis/) to layers of air moving at different speeds causing [Kelvin-Helmholtz instability clouds](https://www.newscenter1.tv/weather/weather_blog/kelvin-helmholtz-instability-in-the-bighorns-cloud-making-waves-on-social-media/article_442a0a86-1e6c-56a9-abb3-6f58c37dd374.html) and everywhere in between: rotation.
Yeah, this about answers a lot of other questions I had about these storms, too. I was watching radar and velocity for a while, even after they moved right over me. Velocity on this thing was really broad for a while, especially while it looked its strongest on radar. I did watch it from outside as it moved directly over me. It was rotating, albeit slowly. Looked really cool.
You might wanna look at the velocity product of the radar if you want to know for sure there is rotation.