Birmingham tornado video

Here is the video of the Birmingham tornado that Brian Peters and I got from downtown on I-65 and I-59.  Some radar pictures are included to show our location relative to the storm.

Below is the one-minute resolution pressure trace from Clay, where the mesocyclone passed directly overhead, but the tornado had lifted.  Centrifugal force in the rotating air aloft throws air molecules out of the center of rotation, reducing the air pressure there and at all points below that to the ground.  This is an extremely rapid drop and rise in pressure.

Category: Severe Weather