Yaw String, from a meteorologist in the United States commenting on Appendix 1 in the Australian investigation:
"What's stated in Appendix 1 also happens in the CONUS. A nighttime MCS can produce considerable downward motion on the flanks of the MCS (what flank depends on the environmental winds). This creates a warm pocket of air due to the rapid subsidence from the stratosphere and sometimes can be seen on infrared as a "warmer" area of cloud tops immediately to the north or west of tstms, embedded in colder cloud tops. The MCS also reeks havoc on flight level winds and can increase them by 50kts or more on the north side of the complex,when compared to modeled flight level winds. I see this all the time in the spring."
MCS is Mesoscale Convective System
He was speaking for the Northern Hemisphere; it may be in the Southern Hemisphere, the winds might appear on the south side of a MCS, but I don't know that.