Winter preparedness
Power cuts, heavy snow, fires and bath accidents, staying in touch and getting information in a disaster, and saving power in winter — gathered from columns checked against official sources (written for Japan).
Key points first
- Split winter preparedness into fire, cold and bathing, snow, and loss of power and water, and work through it month by month from November to February. More
- Keep at least three days of water and food, ideally a week; about three litres of water per person per day. More
- In winter power cuts and snow, carbon monoxide is as much a danger as the cold; fuel-burning heaters need ventilation. More
- Warm the changing area and bathroom first; keep the water at 41°C or cooler and soak no more than ten minutes. More
- Use 171 and web171 to check on family, and agree on one number to leave messages under. More
- To save power in winter, start with the air-conditioner setting and filter, and the windows and curtains. More
Timeline
Newest first. Each event’s date is as checked in the linked column.
- Event
Autumn national fire-prevention week (to 15 November)
Read the column - 17 columns
- Winter preparedness in Japan, 2026: what homes and small workplaces should check from November to February
- Saving electricity at home in winter: air-conditioner settings, filters, windows, kotatsu and standby power
- Preparing for winter blackouts and heavy snow: heating, carbon monoxide, cars and phone batteries
- The early hours of 8 November earthquake (up to shindo 5+): what to check now if you felt it strongly
- Nankai Trough Earthquake Extra Information: what "warning", "advisory" and "under investigation" mean, and what to do
- Preventing power bank fires: buying, charging, disposing and the airline rules
- When J-ALERT issues a ballistic missile warning: what to do outdoors, indoors and in a car
- How many days of supplies at home and at work? Rolling stock and people with special needs
- Choosing and using home heaters: whole room or close to the body, ventilation and running costs
- Two winter risks at home: bathing accidents and house fires, and how families can prepare
- Fixing furniture and seismic circuit breakers: cutting earthquake injuries and power-restoration fires at home
- Earthquake preparedness in Japan, 2026: before, during and after the shaking
- False information and scams that follow disasters and big news: what to check before you share or donate
- Getting by in a power or water outage: bag cooking, toilets, carrying water and keeping warm
- Official sources to check in a disaster: hazard maps, Kikikuru, evacuation info and outages
- Checking on family after a disaster: 171, web171 and the 00000JAPAN Wi-Fi
- Choosing emergency supplies that actually help: the grab bag, home supplies and the things people forget
- 1 column
- Event
Nationwide earthquake early warning drill; the drill is not sent to phones
Read the column - Event
Designated shelters appear on the national overlay hazard map (MLIT)
Read the column - Event
Weather warnings gain level numbers, such as “Level 4 landslide danger warning” (JMA)
Read the column - Event
Snow deaths from November 2025 reach 72 (provisional); 60 died while clearing snow (FDMA)
Read the column - Event
Domestic and Japan flights: up to two power banks in the cabin (transport ministry)
Read the column - Event
The transport ministry issues an emergency heavy-snow statement asking people to avoid non-essential travel
Read the column - Event
Power banks may no longer go in overhead bins on flights (transport ministry)
Read the column
Reading order
- Winter preparedness in Japan, 2026: what homes and small workplaces should check from November to FebruaryHouse fires, accidents in the bath, snow-clearing accidents, power and water cuts. The latest figures from the Fire and Disaster Management Agency and the Consumer Affairs Agency, a month-by-month plan from November to February, priorities for households, older relatives and small workplaces, and the first 30 minutes of a blackout, heavy snow, a water cut or an earthquake.
- How many days of supplies at home and at work? Rolling stock and people with special needsJapan's Prime Minister's Office and the Ministry of Agriculture, Forestry and Fisheries recommend at least 3 days of household supplies, and a week for large-scale disasters. Water amounts, the rolling-stock method, preparing for infants, older people and food allergies, and the 3-day workplace stockpile under Tokyo's ordinance.
- Preparing for winter blackouts and heavy snow: heating, carbon monoxide, cars and phone batteriesIn winter blackouts and heavy snow, the biggest dangers are often carbon monoxide poisoning and getting stranded in snow, not just the cold. Based on guidance from Japan's transport ministry, Meteorological Agency, Consumer Affairs Agency and NITE: heating during a blackout, generators and snow-blocked exhausts, when to stay home, and making your phone battery last.
- Two winter risks at home: bathing accidents and house fires, and how families can prepareWinter is when bathing accidents and house fires increase. Based on guidance from Japan's Consumer Affairs Agency, Fire and Disaster Management Agency and NITE: handling the temperature gap between rooms and the bathroom, bath temperature and time guidelines, testing smoke alarms and replacing them after 10 years, and heater and clothing-fire precautions for homes with older family members.
- Checking on family after a disaster: 171, web171 and the 00000JAPAN Wi-FiRight after a major disaster in Japan, calls struggle to get through. How the Disaster Emergency Message Dial (171), the web171 message board and the carriers' message boards differ, the monthly trial days, what to watch for on the free 00000JAPAN Wi-Fi, and what to agree on as a family.
- Official sources to check in a disaster: hazard maps, Kikikuru, evacuation info and outagesIn a disaster in Japan, the information you can rely on comes from the national government, your municipality and the regional power grid company. How to use MLIT's Hazard Map Portal, JMA's Kikikuru maps and the new level-numbered warnings from May 2026, evacuation levels, outage pages, and what to register in advance.
- Getting by in a power or water outage: bag cooking, toilets, carrying water and keeping warmWhen a power or water outage drags on, problems with meals, toilets, water and cold pile up. Based on guidance from Japan's farm ministry, the Tokyo Metropolitan Government, NITE and the Consumer Affairs Agency: bag cooking and cutting washing-up, handling gas canisters, toilets without water, carrying water from supply points, and keeping warm with newspaper and cardboard.
- Saving electricity at home in winter: air-conditioner settings, filters, windows, kotatsu and standby powerThe quickest way to cut winter electricity use is to start with heating. Based on estimates from Japan's Agency for Natural Resources and Energy and the Government of Japan's public relations site: air-conditioner temperature and filter cleaning, windows and curtains, kotatsu and electric carpets, standby power and lighting, with the assumptions behind each figure.
- Choosing and using home heaters: whole room or close to the body, ventilation and running costsHeaters are easier to choose once you split them into those that warm the whole room and those that warm the area around you. Based on guidance from Japan's Agency for Natural Resources and Energy, the government's public relations site and the Consumer Affairs Agency: what air conditioners, fan heaters, kotatsu and electric carpets do, when to ventilate, how to work out electricity costs, circulating warm air, and humidity.
- Preventing power bank fires: buying, charging, disposing and the airline rulesAccidents involving power banks and other lithium-ion battery products reported to Japan's NITE are rising. Based on guidance from NITE, the Consumer Affairs Agency, METI and the transport ministry: checking the PSE mark and recalls, charging and storage, what to do with a swollen battery, safe disposal, and the carry-on rules in force since April 2026.
Sources checked
Primary sources checked in each column; the links are at the end of each column.
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