Tampa International Airport will be renumbering their runways next week. The reason being the change in the magnetic variation in the area.
The North/South runway will be renamed from 18R/36L to 19R/01L.
This doesn’t happen very often, as in most cases the variation only changes (at the most) 1-2 degrees per 100 years. The closer you move to the poles the quicker this rate of change happens. As much as 1 degrees per year. This is why in Canadian Arctic airspace all runway designations are in degrees true.
More information can be found from tbo.com.