Mine too....
I didn't like the crankish nature of the initial post so I let it cool. "NASA doesn't want you to know that ...."
What bruced is calling Bernoulli, isn't strictly. Al did an ok job though. It's just the crater in the middle of airflow across the flat stretches will be a region of turbulence due to the change in topography and due to the cool-denser atmosphere filling the depression after sunset.
*You live in the hills, don't you. Can you see red sandstone?