Can HAARP, Chemtrails or Cecily Tynan Explain Those Giant Streaks in Philly Sky?

The theories behind Monday's strange sightings.

On Monday afternoon, I was doing some reporting in West Philadelphia when I noticed this pair of huge streaks stretched across the sky. And as soon as I posted about it, the conspiracy theories, practical explanations, silly observations and wild guesses started rolling in. Was this some secret government activity? Alien invaders? Something even worse?

1. Geo-engineered Clouds?

2. Is Veterans Day to Blame? Wonders Cecily Tynan

3. Contrail Shadows?

4. Santa Is Totally Plausible

5. Or Angels Sledding…

6. The Ominous-Sounding Chemtrails

(Really geo-engineered clouds but under a better name)

7. Back to the Future Comes to Life

8. Anticrepuscular Rays

Seems too simple.

9. HAARP

It stands for High Frequency Active Auroral Research Program, but it’s best that I just let nutcase Jesse Ventura explain it to you:
https://www.youtube.com/watch?v=hTvik184IMs

10. Photoshop

Nah.

Well, these reader-submitted photos seem to show what the big blue streaks are: shadows. But shadows of what, Mr. Ventura?