Red light traveling from west to east over Clearwater, FL.

While landing a helicopter at the St. Pete Clearwater Airport (KPIE) a solid red light was observed west of the location.
 The light moved rapidly east at a steady speed, a short distance north of my position at the airport. A check of surrounding air traffic utilizing ADS-B in information showed no other traffic while observing the light. As the light passed overhead it did not change color, intensity, or speed. No sounds was observed due to the volume of the turbine helicopter, which was still running. The light continued traveling eastbound until it was out of sight due to cloud cover and buildings. A check of flights in the area after did not show any flights in the area.
 The light was red in color when views approaching, aside, and while traveling away. It did not blink of strobe and did not have any visible accompanying lights. It appeared brighter than aircraft navigation, taxi, landing, or anti-collision lights.