TWITTER WATCH: New York's Mayor Bill de Blasio Introduces Broadway's 'Emergency Alert System'

Broadway emergencies don't happen very often. Usually they're caused by electric power failures, hazardous conditions from severe weather or Suzanne Somers deciding to bring in a one-woman musical.

But when emergency conditions do arise, many theatre fans are unaware that New York has a system in place to alert ticket-holders of when caution is advised.

As a reminder, New York City's Mayor Bill de Blasio has tweeted the city's official Broadway Emergency Alert System, a color-coded chart to keep fans informed of conditions outside of the usual fabulousness.

Native New Yorker Bill de Blasio is New York City's 109th mayor. Before moving into the traditional mayor's residence, Gracie Mansion, he and his wife, poet and activist Chirlane McCray, resided in Park Slope, Brooklyn with their two children, Chiara and Dante. They are frequent attendees of New York's performing arts, having recently taken in a performance of Danai Gurira's ECLIPSED.