Does anyone have a resource for inclement weather/emergency LED screen graphics for events?

I'm looking for any resource to find inclement weather/evacuation/event delay graphics or somewhere to build them. I'm not entirely sure what to say in them, so I'm also looking for insight from others who use them as well. Thanks guys! It's specifically geared towards concerts, for evacuations, seek shelters, and listening to the direction of event staff during weather events or crowd emergencies.