In addition to the web page notification, the link below takes you to the N.J. Office of Emergency Management list of radio stations that have agreed to broadcast special announcements in the event that inclement weather causes other than normal operation of State Offices:

Radio Station Notification List 

For State Emergency Closing Information, Please See Below

State website: www.nj.gov
DCA website: www.nj.gov/dca
NJOEM website: www.ready.nj.gov
Facebook: facebook.com/ReadyNewJersey
Twitter: twitter.com/ReadyNJ
Instagram: instagram.com/ReadyNJ

NJ State Police
Facebook:
facebook.com/NewJerseyStatePolice

Twitter:
twitter.com/NJSP

Also, most major TV outlets (New York and Philadelphia)