I don't know about the value of listening to EAMs in a prep type event, maybe for tertiary information about widespread reactions based on the number of EAMs going out.... It would be nice to know that
Someone is taking some sort of action after a black swan type event.
Seems like unless a person is sheltering in place, there are more valuable things to monitor. Like police/fire/ems, utility crews, NOAA wx radio, Over the air TV news channels, FM broadcast, AM talk radio-news, CB, FRS/GMRS, Ham calling frequencies, V/UHF air band, VHF marine band, HF coast guard notices to ships etc...etc...
and pushing the monitoring idea, maybe even low earth orbit NOAA satellites to see if there are widespread power outages.
All of which are cool hobby radio monitoring things that could be helpful in a situation that someone is trying to prepare for.
Thanks
Joel