Amateur readings have also been done through social media that claimed extreme temperatures which were later discredited. Videos were posted in one instance that allegedly showed street lights melting or trees bursting into flames. These were later disproven by meteorologists who tied the "evidence" to other unrelated prior events that had taken place.[20] All of the recordings listed before 1972 were allegedly caused by a sudden localized increase in air temperature near the surface, known as a heat burst.