At home
During cold outages, gather people into a smaller interior area, close unused rooms, block drafts, layer loose clothing, and use sleeping bags or blankets to preserve heat. Avoid unsafe indoor combustion. CDC power-outage guidance warns that generators and fuel-burning devices can create carbon monoxide hazards when used indoors, in garages, or near openings. During heat waves, shade, airflow, hydration, and a backup cooling destination may be more important than staying put.
Shelter and warmth checklist
- Home: blankets, sleeping bags, warm layers, hats, gloves, draft blockers, safe battery lighting, and carbon monoxide alarms.
- Vehicle: blankets, extra socks, gloves, hat, traction aid, scraper, visible signals, snacks, water, and phone power.
- On foot: rain shell or poncho, insulating layer, emergency bivvy or blanket, ground barrier, fire-starting method where legal, and headlamp.
- Hot weather: water, electrolyte plan, shade, hat, sunscreen, cooling cloth, and a safe destination if indoor heat becomes dangerous.
In a vehicle
Stay visible, stay with the vehicle if it is safer than walking, and keep warm items reachable from the cabin. If running the engine for heat, clear snow or debris from the exhaust pipe, crack a window slightly, conserve fuel, and run the engine only as needed. Ready.gov winter guidance recommends checking vehicle kits regularly and replacing expired items.
On foot or outdoors
Stop heat loss before chasing comfort. Get off cold ground, block wind, add dry insulation, and protect the head, hands, and feet. Emergency blankets and bivvies work as barriers and reflectors, but they do not create heat on their own. In wet conditions, a simple tarp, poncho, or durable natural windbreak can buy time while you make a better plan.
Hypothermia: signs and immediate response
Hypothermia begins when core body temperature drops below 95°F (35°C). Early signs include uncontrolled shivering, confusion, slurred speech, poor coordination, and pale or blue skin. Shivering stops in severe hypothermia — its absence in a cold person is a danger sign, not recovery. Move the person to shelter, remove wet clothing, insulate from the ground up (ground conducts heat away faster than cold air), cover the head, and apply warmth to the core — armpits, neck, and groin — not the extremities. Warm fluids if the person is conscious and can swallow. Do not rub limbs, which can drive cold blood to the core. Seek emergency help immediately in moderate or severe cases.
Heat illness: signs and immediate response
Heat exhaustion presents as heavy sweating, cool or pale skin, fast weak pulse, nausea, muscle cramps, and fatigue. Move the person to a cool or shaded place, loosen clothing, apply cool wet cloths, and give water if conscious. Heat stroke is a life-threatening emergency: the skin becomes hot and red, sweating may stop, pulse is rapid and strong, and confusion or loss of consciousness occurs. Call emergency services immediately, cool the person aggressively with ice packs to armpits, neck, and groin, and fan them. Heat stroke can be fatal within minutes without treatment. Anyone who was confused or lost consciousness during a heat event needs medical evaluation even after apparent recovery.
Layering system for outdoor cold
Three-layer clothing works because each layer has a specific function. The base layer (synthetic or merino wool) wicks moisture away from skin — wet skin loses heat roughly 25 times faster than dry skin. The mid layer (fleece, down, or insulated jacket) traps air for warmth. The outer shell (waterproof and wind-resistant) blocks wind and precipitation from destroying the insulating air layer. Cotton fails in this system because it absorbs moisture and loses all insulating value when wet. On foot in cold or wet conditions, prioritize dry feet and a covered head — up to 40% of body heat can be lost through an uncovered head in cold wind.
Warmth without unsafe heat
During outages, the safest warmth often comes from reducing heat loss rather than creating new heat. Close off unused rooms, block drafts with towels, gather people in one interior space, layer clothing, use hats and dry socks, and insulate from cold floors. Sleeping bags, wool blankets, and quilts are safer than improvised indoor combustion. Never bring grills, camp stoves, or generators indoors.
For vehicles, warmth planning includes visibility and carbon monoxide prevention. Keep blankets reachable from seats, crack a window if running the engine briefly, and keep the tailpipe clear of snow. For hot weather, shelter means shade, ventilation, hydration, and avoiding unnecessary movement. Warmth and shelter are really temperature-control planning, and both heat and cold can become medical issues.
Priority reset questions
Use this guide as a seasonal reset rather than a one-time read. Ask what changed since the last review: new address, new commute, new school, new medication, new pet, new vehicle, new weather risk, or new family responsibility. Preparedness plans drift out of date quietly. A short review keeps the system matched to the life you actually have now.
Then choose one action that can be finished today. Replace expired supplies, print a contact card, charge a battery, label a container, test one tool, or move gear to the place where it will be needed. Small completed actions beat large plans that stay theoretical.
Document the result of each reset in one sentence: what changed, what was replaced, and what still needs attention. That tiny note makes the next review faster and helps another household member understand the system without asking where everything is or why it was packed that way.
Common mistakes
- Counting on candles, grills, stoves, or generators indoors during outages.
- Forgetting ground insulation and focusing only on blankets above the body.
- Leaving vehicle warmth supplies in the trunk where passengers cannot reach them.
- Overlooking heat illness risk during summer outages.
Maintenance routine
Before winter and summer, update clothing sizes, dry out packed blankets, check batteries, inspect emergency blankets or bivvies for tears, test carbon monoxide alarms, and move seasonal items into reachable storage. Practice setting up a tarp, poncho shelter, or vehicle sleeping arrangement once in mild weather.
Scenario notes
For winter storms, the safest plan may be staying home, reducing the heated area, and avoiding travel. For stranded vehicles, visibility and carbon monoxide prevention matter as much as warmth. For backcountry trips, shelter pairs with navigation and communication; Leave No Trace planning principles also help reduce poor decisions that lead to exposure.
Authoritative references
This guide uses CDC power-outage and carbon monoxide safety guidance, Ready.gov winter and car safety guidance, REI Ten Essentials shelter concepts, and Leave No Trace plan-ahead principles.
