Runway renumbering

Why is AUS airport messing with runway numbers?

We admit it. We’ve always been mystified by the numbers on the signs along airport runways.

The signs seem even more perplexing when an airport reports that the numbers must be changed because of something going on with magnetic changes in the earth.

So we paid extra attention to this Twitter thread from Austin-Bergstrom International Airport (AUS). Now we want to find out more.