Watch means get ready. Warning means move.

Every tornado season, the same confusion costs people the minutes that matter: a tornado WATCH and a tornado WARNING are not the same thing, and treating them as interchangeable is how families end up deciding too late. The difference is simple, and the U.S. National Weather Service built the whole alert system around it. A tornado watch means conditions are favourable for tornadoes across a large area — often many counties at once. Nothing has been spotted yet. The watch is your time to review your safety rules and know where you will go. A tornado warning means a tornado has been detected by Doppler radar or reported on the ground by reliable sources. The threat is real, it is local, and you should seek shelter immediately. Watch: get ready. Warning: move — now. And if you see a tornado or feel threatened, do not wait for any alert at all; get to safety immediately, because precious seconds save lives.

On a watch, do the quiet work in advance: make sure everyone in the household knows the safe place, charge your phones, and keep a weather radio or local broadcast on. The warning is not the time to start planning. It is the time to already be moving.

The safest place in the building

There is no guaranteed safe place in a tornado — the NWS says so plainly — but its guidance is consistent about what gives you the best odds. Go to the lowest floor of a sturdy building, into a small interior room with no windows: a closet, a bathroom, an interior hallway. Put as many walls between yourself and the outside as possible. If you can, get under something sturdy, like a heavy table, and use a mattress, blankets or sleeping bags to shield yourself from flying debris.

Most tornado injuries come from flying debris, not from the wind itself — so the head is the priority. The NWS explicitly suggests putting on a bicycle or motorcycle helmet if one is available, because head injuries are the leading cause of death in tornadoes. A mattress over you and a helmet on your head is not overkill. It is the official guidance.

In a large building — a school, hospital, shopping centre or factory — go to the designated shelter area. If there is none, an interior hallway on the lowest level is the best alternative. Stay away from windows and from rooms with wide, open roofs, which are the parts of a building most likely to collapse.

And retire the old advice about opening windows to "equalise the pressure." The guidance is clear: do not open or crack windows — it does nothing to help and wastes the seconds you need. Shut interior doors instead; that can reduce the chance of the roof lifting off.

Mobile homes: get out

This is the bluntest rule in tornado safety, and the one most worth repeating: no mobile home, however it is configured, is safe in a tornado. Even a weak tornado can destroy one. The Red Cross puts it without qualification — no area of a mobile home is safe. If you live in a mobile home and a watch is issued, act early: go to a community storm shelter, a friend's sturdy house, a nearby business — any solid building. If your park has a designated shelter, make it your safe place now, on a calm day, not during the warning. If no sturdy building is reachable and the warning is already on you, the most interior windowless room you can find is the last resort — but it is a last resort, never the plan.

In a car or caught outside

A car is not shelter. The instruction is the same whether you are driving or on foot: get off the road and get inside a sturdy building. Do not try to outrun a tornado in a vehicle — tornadoes shift direction, and traffic and debris turn the road into the worst place to gamble.

If no sturdy shelter is available and you are in imminent danger: pull over, keep your seatbelt on and the engine running, get your head down below the window line, and cover your head with your hands and anything soft you have — a coat, a blanket. Or leave the car, move well away from it and from trees, get into a low-lying area like a ditch or depression, lie face down, and cover your head with your hands.

And then the overpass — the most persistent and most dangerous myth in tornado safety. Never shelter under a highway overpass or bridge. The narrow structure acts as a wind tunnel: winds funnel through it and speed up, and it offers no protection from flying debris. The NWS calls overpasses one of the worst places you can be. A low, flat spot away from the road is safer than any bridge.

After it passes: the second danger window

The tornado leaving does not mean the danger has left. Damaged buildings can collapse without warning — stay out of any heavily damaged house or building. Stay away from downed power lines, and treat puddles and standing water as suspect: they can hide electrified wires. If you smell gas, leave the building immediately and do not switch lights or appliances on or off. Use the stairs, never the lifts, in a damaged building. Check on neighbours, especially anyone who may need help getting out, and keep listening to local news or a weather radio for instructions. And do not drive into the damage path to look — you block the crews who need those roads.

What our records show, and what they miss

Our incident records hold tornado events the way they hold every disaster: the damage path, the buildings hit, the casualties counted. What the records show, event after event, is how often survival came down to the same few decisions — a family that knew its safe room before the warning, a driver who left the car for the ditch, a mobile-home resident who had already picked a shelter across the street. What the records miss is the quieter ledger: the warnings that were heeded, the helmets that were worn, the overpasses that were driven past instead of sheltered under. Nobody files an incident report for a plan that worked. Make the plan on a calm day, and you join the majority our records never see.

The short version

  • Watch = get ready (conditions favourable, large area). Warning = move now (tornado detected — seek shelter immediately).
  • Safest place: lowest floor, small interior room, no windows, as many walls as possible; under sturdy furniture; protect your head — a helmet if you have one.
  • Mobile home? Get out to a sturdy building or storm shelter. No mobile home is safe in a tornado.
  • Car or outside? Get inside a sturdy building. Never try to outrun it; never shelter under an overpass. Last resort: low ground, face down, head covered.
  • After: stay out of damaged buildings, avoid downed lines and suspect water, gas smell means leave, stairs not lifts.