I don't know what is was, but it's definitely is not one of our F-15 guard jets based here in Fresno. It had a very long front end and a very short diamond shaped wing span. I would say 2/3 of its entire length was its nose. I caught a glimpse of it as it was banking right. It looked like it could have been an F-5, F-104, or a MiG 28. It was all black and moving at a very high rate of speed; faster than our guard jets fly. It made several passes across the entire sky. Very quiet for a jet. Quieter than our F-15s and much quieter than our F-18s. I grabbed my camera, but I was too late.
Something like one of these:
Something like one of these: