The Official Temperature May Be A Lie!

Well, calling it a lie is a bit too strong, but I got your attention.  Often on nights dominated by high pressure to our northwest the Cincinnati tristate's official temperature, observed at CVG, is warmer t han the surrounding area and not representative. 



The terrain around Cincinnati, many broad uplands and many deep, steep valleys.



It is because the warm air over the densly populated part of the tristate is transported by the northeasterly winds to the airport and the airport as a result stays warmer than would be expected without the northeasterly winds.

So on a clear night valleys get much cooler than uplands because of cold air drainage and uplands in the path of the warm plume from the urban heat island stay warmer than uplands not in the path of  the warm plume.  The transport of warm air by the wind is called by meteorologists warm air advection.

The video has more.