These are neat images, but it's hard to tell how they differ from long exposures taken without any illumination by atomic blast. I've taken long exposures at night that look very similar.

pet peeve - pick one:

"How the Atomic Tests Looked from Los Angeles"

or

"What the Atomic Tests Looked Like from Los Angeles"

just don't mash them together like this.

Nevada tests, done north of Las Vegas, were all pretty small, and they produced flashes visible from LA. Imagine a big one.