[10] Prior to the late 1970s, the entire multistory "step-pyramid/mausoleum" structure at the top of the building was neon-illuminated, changing colors to provide a weather forecast that could be seen for many miles.

Although the terraced sides were once again illuminated at night (by means of spotlights), the entire pyramid structure no longer changed color with the weather (the pinnacle beacon still had that function).

Starting with the 2001 opening of PNC Park across the Allegheny River, fans noticed that after Pittsburgh Pirates home-runs, the "beam" light flashes in celebration.

Recently it was revealed that the afternoon and evening receptionist at the lobby desk was the one responsible for this fan favorite, following the games on her cabinet radio.

In partnership with KDKA-TV, the Gulf Tower was retrofit with a modern, automated LED weather beacon able to tell a more complete forecast than ever before.