Silver Jackets is defined on their web site as: "Effective and continuous collaboration between state and Federal agencies is critical to successfully reducing the risk of flooding and other natural disasters in the United States and enhancing response and recovery efforts when such events do occur. No single agency has all the answers, but often multiple programs can be leveraged to provide a cohesive solution."
As for the term Silver Jackets, there is this explanation: "Traditionally, different agencies wear different colored jackets when responding to emergencies. For example, FEMA personnel wear blue and Corps personnel wear red. The name Silver Jackets is used to underscore the common mission of the diverse agencies involved. Responding team members wear silver jackets to emphasize this unity of purpose." In the military (back when) we called these people and joint efforts "Purple Suiters."
Check the map at the web link above and see if there is an "Active Intergovernmental Flood Risk Management Team" in your state. I would think that these should be people and efforts that you would be interested in.
