Nixle is a secure messaging service that allows city departments to send out both mobile text messages as well as emails (recipient's choice) instantly. If the department chooses, they can limit the broadcast range down to a single city block so those outside the affected area are not sent unnecessary messages.

Departments currently offering nixle service:

Manchester, NH: Highway Department (SMS: Manchester, NH HW)
Alerts: Snow Emergency - Winter Parking Ban
http://local.nixle.com/manchester-nh-highway-department/ 

Manchester, NH: Police Department (SMS: Manchester, NH PD)
Alerts: Major Road Closures, School/ Area Lock Downs
http://local.nixle.com/manchester-nh-police-department 

Manchester, NH: Fire Department (SMS: Manchester, NH FD)
Alerts: Emergency Operations Center Events (Major Public Safety Incidents), Terror Threat, Major Weather Emergencies
http://local.nixle.com/manchester-nh-fire-department/

Manchester, NH: Public Schools (SMS: Manchester Schools)
Alerts: Weather Related Closures, Building Mechanical Closures, Followup to Police Lockdown
http://local.nixle.com/manchester-nh-public-schools 

Manchester, NH: Health Department (SMS: Manchester Health)
Alerts: Large Outbreaks, Significant Recalls (food), Public Health Advisories, Contamination Boil Orders
http://local.nixle.com/manchester-nh-health-department

Any issues or questions regarding Nixle service should be directed to Nixle.com.

Twitter is a messaging service that allows mobile text messaging for subscribers as well as a web based blog type format and rss feeds. The city offers messages via twitter for those who are more comfortable with this service than Nixle or our email newsletters. Messages generated in Nixle or our email newsletters are sent to twitter and re-broadcast to its subscribers. This service is subject to Twitter's capacity and occasionally delays and dropped messages do occur.

Departments currently offering Twitter service:

City Account (combines several department accounts)
http://twitter.com/manchester_nh
List: http://twitter.com/manchester_nh/city-departments

Snow Emergency (Parking Ban - Highway Department)
http://twitter.com/mht_snow_emerg

Fire Department
http://twitter.com/ManchesterFD

Police Department
http://twitter.com/mht_nh_police

Library
http://twitter.com/manchlibrary

Youth Services
http://twitter.com/OYSManchester

Health Department
http://twitter.com/mht_nh_health

Manchester Public Schools
http://twitter.com/mht_nh_schools