4:30 PM PT -- L.A. weather was extremely foggy Sunday morning, and law enforcement sources tell us even LAPD air support was grounded because of it. Flight tracker data shows Kobe's chopper appeared to first encounter weather issues as it was above the L.A. Zoo. It circled that area at least 6 times at a very low altitude -- around 875 feet -- perhaps waiting for the fog to clear.

We know the pilot contacted the control tower at Burbank Airport around 9:30 AM PT, and the tower was aware the pilot had been circling for about 15 minutes. The pilot eventually headed north along the 118 freeway before turning to the west, and started following above the 101 freeway around Woodland Hills, CA.

At around 9:40 AM they encounter more weather -- as in seriously heavy fog -- and the chopper turned south. This was critical, because they turned toward a mountainous area. The pilot suddenly and rapidly climbed from about 1200 feet up to 2000 feet.
However, moments later -- around 9:45 AM -- they flew into a mountain at 1700 feet. Flight tracker data shows they were flying at about 161 knots.