Distinct mast effects on SE sonics

From 20-22 UTC on 8 April, the wind direction held steady, at all levels, at ~ 340-350 deg. 

Snapshot from NCAR data browser of wind directions on tower sonics

Recall that the NW booms point to 334 deg and the SE booms point to 154 deg.

Schematic of BAO tower

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!

Snapshot from NCAR data browser of wind speeds on tower sonics

This is a reminder to all of us to be very careful with our data analysis to avoid any potential mast effects!