My plans are for (in order of most to least likely):

1. Accident in the woods
I think this is my most likely cause for alarm. The hazards I face include abandonned oil wells, alligators, poisonous snakes, feral hogs and injuries like broken bones.
My precautions include giving DW detailed travel plans and carrying the proper gear/clothing. I also practice many bushcrafting skills (edible plants, fire making, etc...).

2. Hurricanes
Houston is due for another big one. Precautions include custom window covers, plenty of food/water/batteries, emergency power sources, great neighbors.

3. Flooding
Our house is in a 500-yr flood zone. We have insurance and a written plan on what to do if flooding occurs.

4. Tornado
We are screwed.

5. Power outage
Battery powered tv, radios, backup power supplies for fans.

6. Stranded while travelling (local)
Flooding can trap me at work or DW while she's out and about with the kids. Both cars are stocked with food, snacks, tools, mess kits, personal hygine kits, maps, etc...
In my office I have assorted supplies stocked away to make an overnight stay in my office comfortable.

7. Stranded while travelling (USA)
When travelling dosmestically for work I carry maps of the area along with a country map. Thanks to Wildman, I have built a "scrounger's tool kit" along with my "Get Me Home Gear" which includes a small radio, flashlight, rope, knife, first aid kit, AMK heatsheet, etc...

8. Stranded while travelling (international)
Maps, phrasebook, addresses & phone numbers of American consulates, money, anti-diahrrea meds, water purification tablets plus scrounger and GMHG kits (except for knife when in Mexico).

9. Riots
Good neighbors, respectable firepower, plenty of poison ivy

10. Terrorist attack
Small to zero chance of being caught in the attack. Economic downturn is biggest worry. Living debt-free except for mortage, have saved up good emergency slush-fund to get us through. Food harvested from garden and assorted edible landscaping.

-Blast