Preliminary boundary layer top height from wind profiler signal-to-noise ratio for the STRATUS 2007 cruise. The most probable maximum of profiler signal-to-noise ratio is chosen as the BL top. BL top found in this way compares favorably to soundings. Formatted by column: yearday UTC time of day (UTC seconds) height of boundary layer top (km) Simon de Szoeke 20 December 2007