Theory is all well and good, I can assure you that it is exceedingly rare in reality for 20 knot surface winds to have minimum 45 knot winds at 1600ft without a synoptic forcing feature such as a front or terrain influences such as a nocturnal jet setup, and even then that is alarmingly strong winds just above the surface.
I look at observation radiosondes and model traces of this stuff daily to forecast aviation weather, if the OP scenario occurred in reality I would highly likely forecast moderate turbulence across flat terrain. So having that as the hard coded requirement is basically mandating moderate (over flat terrain) to severe (over hills of only 2000ft) turbulence across significant areas.
As an example, this is the gradient wind analysis, aka wind strength approx 1500-2000ft MSL, for this morning. Not much strength above 30 knots let along 45 knots, can only see it around strong synoptic features as I stated, such as the Indian ocean low and the Typhoon off Japan. I accidentality linked the address rather than the static image, I have updated it with a image file of today's chart only. Still the only area above 30 knots is ahead of a synoptic feature, the low and trough over Western Australia.