Comment Actually somewhat common (Score 5, Informative) 317
This has happened before, and it'll happen again.
Airport runway numbers are based off their magnetic headings with the last zero removed. So a runway that runs due south/north is 18/36 (i.e., it faces 180 degrees south and 360 degrees north - 0 isn't used). A runway that runs due east/west is 9/27. And so on. When there are parallel runways facing the same direction, the L, C, and R designations are used. A pair for parallel east/west runways are 9R/27L and 9L/27R.
So as the pole drifts this sometimes causes runways to have be renumbered. One previous example is Reagan-National airport in Washington, D.C., where runways 1/19 and 4/22 were originally 18/36 and 3/21.
Airport runway numbers are based off their magnetic headings with the last zero removed. So a runway that runs due south/north is 18/36 (i.e., it faces 180 degrees south and 360 degrees north - 0 isn't used). A runway that runs due east/west is 9/27. And so on. When there are parallel runways facing the same direction, the L, C, and R designations are used. A pair for parallel east/west runways are 9R/27L and 9L/27R.
So as the pole drifts this sometimes causes runways to have be renumbered. One previous example is Reagan-National airport in Washington, D.C., where runways 1/19 and 4/22 were originally 18/36 and 3/21.