Heat Stroke Alert helps to raise awareness of heat and promote measures against heat illness among the public. They are issued daily at 5 a.m. and 5 p.m. based on WBGT index forecasts.
The daytime high and early-morning low temperatures expected to prevail in each 20 x 20 km grid are shown. The forecast is updated at 5:00, 11:00 and 17:00 JST every day.
Early Warning Information on Extreme Weather is issued at 14:30 JST every Monday and Thursday when very high or very low five-day average temperatures are expected in the next 6 to 14 days with a probability of 30% or more.
The temperature, humidity and atmospheric pressure data shown here are measured at surface weather stations such as Regional Headquarters, Local Meteorological Offices and automated weather stations.