Tokyo, Japan, 26 August (Brussels Morning Newspaper) – Japan plans to extend detailed daily weather forecasts from seven days to two weeks by 2030, as authorities seek to improve preparations for extreme heat, heavy rain and snow linked to a changing climate.
Longer forecasts widen the warning window
The Japan Meteorological Agency (JMA) plans to provide daily forecasts covering up to two weeks. These are expected to include weather conditions, maximum and minimum temperatures, rainfall probabilities and information about forecast confidence.
Authorities also aim to extend information on the possibility of warning-level heavy rain and snow, giving residents, councils and emergency services more time to prepare for severe conditions.
Extreme weather raises pressure to adapt
An expert panel convened by the JMA highlighted the repeated impact of extreme weather across Japan.
The panel said:
“In recent years, extreme heat, heavy rain and heavy snow have caused damage across Japan on an almost annual basis.”
The proposed Japan weather forecasts are intended to make longer-range information more useful as climate risks become increasingly important to public safety and economic planning.
Better predictions support earlier decisions
Improvements in numerical weather prediction have increased the potential value of longer-range forecasts.
Earlier indications of extreme heat or heavy snowfall could help local authorities prepare emergency measures, while transport operators, energy providers and businesses could adjust staffing, supplies and schedules before disruptive weather arrives.
Households could also gain additional time to plan journeys and take precautions during periods of heightened weather risk.
Climate risks reshape Japan’s forecasting system
The changes form part of a wider effort to adapt forecasting services to changing weather patterns. The expert panel described forecasts covering periods from one week to several months as important infrastructure for climate adaptation.
The JMA is working towards introducing the expanded system by 2030. If implemented as planned, Japan weather forecasts will provide a significantly longer window for assessing potential weather risks and preparing for disruptive conditions.
