Anon over at GAW made nice gif of the radar anomaly over Havana that took place several hours ago.
sauce
https://greatawakening.win/p/141FFFOEA1/havana-spiral/c/
some say this effect can occur when 2 radars are turned on in close proximity to one another.
not really sure.
maybe anons with radar experience in mil or civilian aviation could speak to this.