河川地図 by Masahiro Tomosada






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Access real-time river conditions and weather forecasts across Japan. View over 10,000 river locations on a map and check detailed precipitation, temperature, and snow data. Stay informed about weather changes to prepare for heavy rain and other natural events.


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Get real-time rain cloud information for the entire country, with forecasts up to 13 hours ahead. Easily check daily weather, precipitation intensity, and severe weather alerts. Access detailed meteorological data and radar imagery for informed planning.