The flashing buoy I see is not in the Gulf of Mexico.
It’s way out in the Atlantic Ocean.
I’m thinking a malfunction of some kind.
Yeah, it’s east of the Bahamas and North of Puerto Rico.
It’s a DART (Tsunami detection buoy).
Shows some sharp oscillations in water height in the last three hours.
No notable earthquakes near it, though.
Most likely some sort of malfunction; if not the (remote) possibilities are a tsunami induced by an underwater landslide; I think an asteroid would have been noticed.