NOLAready

Here is the website to get alerts on your cell phone, etc. in case of an emergency in New Orleans.
Here are examples of when NOLAReady may be used:

Life-threatening weather
Amber Alerts
Highly disruptive road shutdowns
Evacuation or Shelter in Place information
Boil water notices
Information about emergency shelters
Other emergency information

When an emergency occurs, authorized senders will instantly notify you using NOLAReady. NOLAReady is your personal connection to real-time updates, instructions on where to go, what to do, or what not to do, who to contact and other important information.

It's run by the city of New Orleans and powered by Roam Secure Alert Network.