Our emergency management partners typically use the ICS-213 form. To help facilitate the use of these forms on the amateur radio NTS program, NTSOK has created the following form. Feel free to use this in your efforts to send ICS-213 messages.
The ARRL website has an informative page that details the process of sending and receiving ICS-213 forms over NTS, and how you can convert from ICS-213 to Radiogram traffic modes.