A severe storm is rarely one hazard. The same system can bring damaging wind, frequent lightning, hail, and flash flooding within an hour, and each one creates a different household problem: the power fails, a tree comes down, water gets in, roads flood, and the people inside have to decide, quickly, whether staying put is still the safe choice.
Good preparation is mostly done before the sky darkens. It protects people first, then the building, power, water, communication, and a safe recovery — and it accepts one hard limit up front: a home is only a shelter while it can keep you safe. When it cannot, leaving early beats waiting.
Know the difference between a watch and a warning
This is the single distinction that changes what you do, so get it right before a storm, not during one.
- A watch means conditions are favorable for severe weather. It is your window to prepare: charge devices, bring in loose objects, review where you would shelter, and stay near a reliable source of alerts.
- A warning means severe weather is happening or imminent in your area. Act now. Move to your safe location and stay there until the warning is lifted.
The National Weather Service issues these for severe thunderstorms, tornadoes, and flash floods separately, and a single storm can trigger more than one at once. Treat the most urgent one as your instruction. Getting alerts through more than one channel matters, because the power and cell network are exactly what a storm takes down — the emergency alerts and communication plan covers building that redundancy before you need it.
Before the storm: the work that pays off
Almost everything useful happens here, on a calm day, with time to think.
Protect the people and the plan. Decide in advance where the household shelters from wind — an interior room on the lowest level, away from windows — and make sure everyone, including children and anyone with a mobility limit, knows it. Settle the harder question ahead of time too: the point at which you would leave rather than stay. The evacuate-or-shelter decision guide walks through that call without pretending there is a single right answer.
Protect the building. Wind and water find the weak points first. A pre-season pass on the roof, gutters, drainage, and exterior seals removes most of them — the pre-storm exterior and drainage inspection and the early roof-damage warning signs cover what to look for and what to leave to a professional. The home-hardening steps in the hurricane home-preparation guide apply to any damaging-wind event, not just hurricanes. Stage the storm and blackout repair tools before the season, while stores, daylight, and calm weather still cooperate.
Protect power and comfort. A severe storm and a multi-hour outage usually arrive together. Sizing backup power, storing water, and keeping light on are all their own decisions, owned by the backup power hub, the emergency lighting plan, and the power outage guide. This hub does not repeat them — it points you to them before the lights go out.
Bring the pets and the medical needs into the plan. Animals need a carrier and a plan of their own, covered by the pet emergency preparedness hub. Anyone who depends on a powered medical device needs a continuity plan that assumes the power will fail, which is the whole subject of the medical device outage plan.
Bring in what the wind can throw. A severe thunderstorm can gust well past the point where patio furniture, planters, bins, and unsecured gear become projectiles. On a watch, the quick pass around the yard or balcony — moving loose objects inside or securing them — prevents both broken windows and injuries. Apartment residents are not exempt: anything on a balcony that can be lifted by wind is a hazard to the floors below.
If you rent or live in an apartment
Much of the building-hardening work is not yours to do, and that is fine — your plan shifts to what you control. Know your building’s designated shelter area and stairwell before a storm, since elevators stop working the moment the power does; the floor-by-floor apartment outage plan covers how building type changes the answer. Report a roof, window, or drainage problem to management on a calm day rather than discovering it mid-storm, and keep your own go-bag and shelter-in-place supplies ready regardless of what the building provides.
During the storm: fewer decisions, made calmly
Once a warning is active, the goal is to have almost nothing left to decide.
- Get to your safe location and stay off the phone for anything but emergencies. Interior room, lowest level, away from windows and exterior doors.
- Treat lightning seriously. The CDC’s guidance is blunt: when thunder roars, go indoors, and stay inside for 30 minutes after the last thunder. Indoors, stay off corded electronics and away from plumbing during the worst of it.
- Never run a generator, grill, or any fuel-burning device indoors, in a garage, or near a window. Carbon monoxide from storm-outage generators kills people every year. The generator and carbon monoxide safety warning is the one page to read before you ever start a generator.
- Stay away from floodwater. It hides downed lines, sharp debris, and depth you cannot judge. Do not drive through it; do not walk through it to check on something.
- Do not go outside to inspect damage until the storm has fully passed and you know there are no downed lines nearby.
Two hazards worth naming on their own
Wind and lightning get the attention, but two others cause a disproportionate share of storm damage and deaths.
Hail is a property hazard more than a personal one, as long as you are indoors. If a storm is producing hail, stay away from windows and skylights, and move a vehicle under cover if you can do it safely before the storm arrives — not during it. Never go outside to move a car or cover a window once hail has started.
Flash flooding is the quiet killer. It develops fast, often after the heaviest rain has moved on, and it does not take much water to sweep away a person or a vehicle. The rule is simple and non-negotiable: turn around, don’t drown. Do not drive or walk into water of unknown depth, and treat a flooded road as closed even if it looks shallow. If you are in a flood-prone area, know your higher ground before the water rises.
After the storm: recover without creating a second emergency
The hours after a storm cause their own injuries, mostly from moving too fast.
- Assume every downed line is live and keep everyone well back. Report it to the utility; do not touch anything in contact with it.
- Photograph damage before you touch it. Insurance claims depend on evidence captured early — the document-damage-before-cleanup checklist exists for exactly this moment.
- Re-enter a damaged or flooded home carefully, and not at all if its structure is uncertain. Cleanup after water, wind, or contamination has an order to it, owned by the post-disaster cleanup hub.
- Keep watching official channels. Flash flooding often peaks after the rain stops, and a second line of storms can follow the first.
The honest limit
This hub organizes the sequence; it does not replace the instruction in front of you. Current National Weather Service watches and warnings, your local emergency managers, and your utility control every real decision during a storm — a warning always outranks a plan. Call 911 for a downed line, a lightning strike, a gas leak, suspected carbon monoxide, a collapse, or any serious injury. Everything on this page is worth more the earlier you do it, and worth very little once the wind is already at the windows.
Sources reviewed
ReadyLience reviewed National Weather Service thunderstorm, lightning, and wind safety guidance, Ready.gov severe-weather and thunderstorm preparedness pages, CDC lightning safety guidance, and CPSC carbon monoxide safety information. This page is a planning overview that routes each decision to its specialist guide; it states no structural, electrical, or medical procedure of its own. Watches and warnings, emergency-management instructions, utility directions, and qualified professionals control the actual response, and this hub remains in expert review.