I took cancer meds shortly before this... ball lightning? event and immediately started coughing again after it hung out right over my base for a long time, I'm fairly certain it's radioactive unless I somehow passed too close to the barrels in the far river without realizing it (no smoking either)- might be other cancer causing events too though I guess.
Also if Nose sees this and it is radiation artifacting, radiation grain in photos is actually grains of pure R, G, and B sensor being set off, not white- the radiation is too small to hit multiple parts of the sensor at once and cameras don't have a "white" sensor- it's a nitpick but it might serve the more overly-analytical players to know that it's not an electrical interference but radioactive