Some local residents are wondering why they got a false alarm late Wednesday morning. About 500 people got a weather warning about a tornado in the Charlottesville-Albemarle area. The alerts came in via phone calls and text messages, then they were notified the warning was a mistake. The problem originated in the Emergency Communications Center that serves the city, county and UVA. The director of the local emergency system says a button for a preloaded notification was accidentally pressed during a training exercise.