nad,
Take a look at the raw data:
http://www.geo.fu-berlin.de/met/ag/strat/produkte/qbo/singapore.dat

Monthly mean zonal wind components ( 0.1 m/s)
at Singapore (48698), 1N/104E

So when you see values that reach 100, that actually should be multiplied by 0.1 to get wind speed in m/s.

Or is it confusion about what height means? In meteorology, atmospheric height is often described in terms of an equivalent pressure reading, called the geopotential height. So you get a quick feel for how thin the air is. Of course the thinner the air is, the faster it can blow since it carries less momentum. So 70 hPa is 0.07 as dense as the standard sea-level pressure reading of 1000 hPa.