A few key points and an explanation for my bag(s) in particular.
My bag has more kit in it than a regular Go Bag likely would have, in part because of what I do. Depending on what is going on, I might be called up to head into/towards a disaster area, so I have my own comms amongst other things. I also might be called upon for SAR, which is why I have a smoke signal. The arrangement itself in backpack form allows me to hike with the Go Bag, so if I can no longer drive into/out of an area then I can get out on foot. Given how quickly roads can become impassable due to trees/lines down, snow, flooding, or even just traffic, I felt it important to be able to carry my kit.
Now for the whole Shelter in Place/Evacuate question... The really depends on what the situation is and what local gov't recommends.
Take the recent situation in
Boston. In this case, it was felt safer for the public to remain in their homes instead of temporarily relocating to a safer location.
However, for places prone to things like flooding or wildfires, then a person's home can be threatened and the people should evacate, even if they live in an urban area. Sandy is a good example of that, since people in Zone A in NYC were advised to evacuate due to the flood risk. There also times when people will be advised to evacuate due to a health, safety or security risk. At these times, people will again need to quickly and likely unexpectedly leave their homes. Something like an apartment fire in a tower block can quickly displace hundreds of people.
That is really what a Go Bag is for, an arrangement of kit that one just needs to grab if one has to leave in a hurry. I just happen to have more stuff I want to grab...
Some things I have learned is that in addition some of the
basic emergency kit recommendations, there are a few extra items which can make life easier and/or more comfortable.
1. Glowsticks - provide dim light for long periods of time, and chemically non-reactive. These are great if some light is needed but a spark cannot be risked (like a possible gas leak). They can be tossed into a basement/cellar to check if flooded and power is out. They can also be taped to a wall or ceiling if some lighting is needed and power is out, very helpful in a place like an emergency shelter where there has been a generator failure and interior rooms/corridors are dark...
2. Multi-purpose liquid soap - Camping or backpacking soap like
Dr. Bronner's Soap can be used to keep oneself clean, and then also be used to wash ones dishes and utensils, and clothes. If one has to have an extended stay at an emergency shelter or otherwise away from home, being able to clean what you eat with and wear is important for both health and comfort reasons.
3. Emergency NOAA/Weather radio - mentioned in the basic kit, but wanted to emphasize the worth of something like this. When one is away from home, particularly if forced to seek emergency shelter, the one does not have the normal access to channels of information like TV, internet news, etc. Even with smartphones and cellular data networks, those can go down during bad or widespread events. Having a mini radio which can be used to monitor for new bulletins can let people know what areas are safe, if further evacuation is needed, and importantly when it is safe to go back to their homes.
-Cheers