Japan's five alert levels explained: evacuate by Level 4

Japan uses a five-level scale for evacuation information during floods, sewer overflows, landslides, storm surges and tsunamis. Whether you live in Japan, are visiting, or are simply curious how a disaster-prone country communicates risk, the scale is worth knowing: it tells people not just how bad things are, but who should move and when. The English names below are those on the Japan Tourism Agency's "Safety tips for travelers" pages, which credit the Cabinet Office.

The levels that matter

Levels 1 and 2 are advance information from the weather agency, telling people to stay alert and check how they would evacuate.

The rule: evacuate by Level 4

The official guidance is blunt: do not wait for Emergency Safety Measures (Alert Level 5) to be issued; evacuate from anywhere in danger at Evacuation Instruction (Alert Level 4) or lower. There are two reasons. Level 5 means a disaster is already happening, so moving may no longer be safe. And your municipality may not issue Level 5 at all, because it may not be able to confirm what is happening on the ground.

Older guidance had an extra step called "Evacuation Recommendation" (避難勧告). It was abolished on May 20, 2021, and merged into Level 4. If you learned the old system from a guidebook, forget that step.

"Evacuate" doesn't always mean "go to a shelter"

Japan's Cabinet Office and Fire and Disaster Management Agency put it this way: if you are in a safe place, you do not need to go to an evacuation shelter. Japan's government describes several kinds of evacuation:

• Leaving for a designated evacuation site, or for the home of relatives or friends in a safe area. (The Prime Minister's Office recommends agreeing on this with them in advance.)
• Staying indoors, but only when a hazard map shows your home is outside the zone where flooding could knock houses down, your rooms are higher than the expected flood depth, and you have enough water and food to wait until the water goes down.
• Emergency safety measures: if leaving has become dangerous, moving to an upper floor or a room away from a cliff.

2026: weather warnings now carry levels too

In 2026, the Japan Meteorological Agency reorganized its warnings for heavy rain, floods, landslides and storm surges into the same five levels. JMA's "Urgent Warnings" are equivalent to Alert Level 4, and JMA says it is important to finish evacuating while they are in effect. So you may now see a "Level 4" both on a weather warning and on your city's evacuation information. Note that one JMA English page calls Level 4 "Evacuation Order" rather than "Evacuation Instruction"; both refer to the same step.

For visitors to Japan

The tourism agency's advice for travelers is practical: if you are from abroad, check what Japanese people around you are doing, and evacuate to a safe place as early as possible. Our additions:

• Turn on emergency alerts on your phone before you travel.
• When you check in, find the nearest evacuation site on the hotel's posted map or ask the front desk.
• Japan's national Hazard Map Portal Site (in Japanese) lets you search an address for flood, landslide, storm surge and tsunami risk.
• If you're camping by a river or hiking in heavy rain, treat Level 3 or Level 4 as a reason to leave, not a reason to wait and see.

How it compares with the U.S.

The U.S. has no single national five-level evacuation scale; evacuation orders come from local officials. What carries over is the principle behind Japan's design: decide in advance who leaves early (people who need more time), and act on the step before the worst one.