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Home > Weather and Earthquakes > Early Warning Information on Extreme Weather

Early Warning Information on Extreme Weather

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  Early Warning Information on Extreme Weather is issued at 14:30 JST every Monday and Thursday when a high probability (30% or more) of very high or very low seven-day average temperature or very heavy seven-day total snowfall is predicted in the week starting from five to eight days ahead of the date of announcement. If information was issued on the preceding announcement date, follow-up information will be issued on the next announcement date. The term very heavy refers to seven-day total snowfall in the top 10% of all samples.