If you have outlasted a tornado, keep the radio on and ensure the storm system has passed before venturing out of your safe location. You will want to stay tuned to emergency stations or a news channel to find out if your community has any announcements or instructions for seeking assistance or medical help.
When leaving your home, remember you might not have easy access to it again. If utility crews or emergency personnel need to block the road or the structure is deemed unsafe, you need to be prepared to be uprooted for awhile. Keeping ID on your person at all times will help when approached by authorities, especially if there is a lot of damage to your neighborhood and they are keeping a watchful eye on the properties.
Immediately after the storm, once you have determined your own health status, look for others. People might be trapped under debris or otherwise injured. Administer first aid and don't forget to call 911. Otherwise try to stay off the phone lines, so others in need of aid can reach out for assistance.
Avoid metal objects, especially if there are downed power lines in the area (fallen trees often hide damaged lines). Ensure you use battery powered light sources, not candles, and don't use matches or lighters until gas lines have been inspected for damage.
Flooding in your home can bring many dangers, both immediate and long term. Be careful of electrical problems and don't turn the power back on until given a thumbs-up by a professional inspector. Water damage can worsen the structure and bring in more debris. Along with flooding also comes the displacement of animals, so beware of local fauna finding shelter in your home as these creatures also try to survive the disaster.
Don't drink the water. Flooding brings contaminants, and until you know your water source isn't compromised, either boil it or drink from the gallons you have stored for just this occasion.
When repairs begin, get rid of hazards first. Remember children and pets will be walking around and they don't recognize danger as readily as adults do. Look for items that they can hurt themselves with, such as nails and debris, but also medicine bottles, household chemicals and flammables such as gasoline or propane.
Remember that you will need your insurance and utility information, and keeping this in your emergency kit will be very helpful if you emerge from the storm and your house is demolished.