In 2002 the US government pulled the wool over the eyes of approx. 450 scientists that they rushed to Florida for an investigation called Crystal-Face. They were investigating anvil clouds, the atmosphere effect and the ice crystal content. One investigator defaced his report with “Is this real” in bold lettering across the last page of his report. Unbeknownst to them, they were actually tracking incoming craft from deep space that caused the formation of the anvil cloud. The small puff of a cloud on the flattop of the anvil indicated the direction the craft went.
Welcome to the NASA Earth Science Mission, CRYSTAL-FACE
CRYSTAL-FACE Pre-Mission Presentations
Manus and Nauru Island Ground Information 05/01/02, Gerald Mace
See for yourself.