Ranked by how often it has actually been declared here — and what goes wrong in each, which is almost never the thing people prepared for.
13 declarations in Tennessee
The storm is not the emergency. The outage is.
What kills people afterwards is the generator. Portable generators cause roughly 100 unintentional carbon monoxide deaths a year in the United States, and they cluster in the days after a storm when the power is out. Carbon monoxide is odourless, and by the time you are confused enough to notice, you are too confused to act. Outside, far from the house, never in a garage with the door open.
Source: CPSC
Do this tonight
Find out whether your generator has ever been started. If the answer is no, start it — an untested generator is a heavy paperweight with a full tank of fuel.
More on severe storms →3 declarations in Tennessee
Where you are matters more than what you do.
Since 1996, 815 people have been killed in mobile or manufactured homes — 53% of everyone killed at home by a tornado, in housing that makes up under 6% of American homes. Anchor failure is the usual cause. If you live in one, the plan is not to shelter in place. It is to know, in advance, exactly where you are going instead.
Source: AP analysis of NOAA data
Do this tonight
If you live in a manufactured home, drive to your nearest sturdy shelter once, in daylight, and time it. That number is your warning threshold.
More on tornadoes →2 declarations in Tennessee
Two things kill, and neither is the cold on its own.
Carbon monoxide, when the heat fails and people bring a generator or a grill inside — generators are the single largest source of non-fire CO deaths. And hypothermia, which claims around 1,300 Americans a year. The house going cold is survivable. What people do about it is what is not.
Source: CDC / CPSC
Do this tonight
Find your water shutoff and make sure somebody other than you knows where it is. Frozen pipes do more damage than the cold ever will.
More on winter storms →2 declarations in Tennessee
People drive into it.
More than half of all flood deaths are vehicle-related. It takes twelve inches of moving water to carry off a small car and eighteen to move a larger one. It is almost never a road you do not know — it is the one you have driven a thousand times, where you cannot see how deep it is or whether the road is still there underneath.
Source: NWS / CDC
Do this tonight
Photograph every room in your house. It takes about eleven minutes and it is your insurance claim. Then move anything irreplaceable off the floor.
More on flooding →2 declarations in Tennessee
This is the one that leaves you dark for a week.
Ice brings the lines down across a wide area at once, so restoration runs into days rather than hours. That is what makes it dangerous — the longer the power is off, the more likely somebody brings a generator or a grill somewhere it should not be.
Source: CPSC
Do this tonight
Work out how you would keep warm for five days without the furnace, and make sure the answer does not involve burning anything indoors.
More on ice storms →1 declaration in Tennessee
Underestimated because of the name.
The rain and the outage do the damage, not the wind — which means the same generator and floodwater failures that follow a hurricane follow this too.
Do this tonight
Treat the preparation as identical to a hurricane. The name is the only thing that is smaller.
More on tropical storms →1 declaration in Tennessee
The illness is not the whole emergency.
In June 2020, 41% of US adults had avoided medical care because of COVID concerns — 12% skipped urgent or emergency care and 31% skipped routine care. The households that struggled were the ones with a prescription, a chronic condition or a caregiving duty and no plan for any of them.
Source: CDC MMWR
Do this tonight
Write down every prescription in the house with its dose, and find out how early each one can be refilled.
More on public health emergencies →1 declaration in Tennessee
The people who die are usually the ones who could not leave.
In the Camp Fire, 85 people died, most within the first twelve hours. Most of them were older residents whose homes burned before anyone could reach them — not people who chose to stay, people who could not get out on their own. The roads out of Paradise gridlocked and some abandoned their cars and ran. The decision that saves you is made before the smoke, not during it.
Source: NIST / California Senate review
Do this tonight
Name the person in your household who could not get out alone, and name who is responsible for them. If nobody has that job, nobody will do it.
More on wildfire →