From 20-22 UTC on 8 April, the wind direction held steady, at all levels, at ~ 340-350 deg.
Recall that the NW booms point to 334 deg and the SE booms point to 154 deg.
This flow condition results in a prolonged and distinct tower wake (or mast effect) on the sonics on the SE boom. Wind speeds at the SE booms during this time period are 4-5 ms-1 slower than those measured on the NW booms!
This is a perfect example of mast effects for our classes!