JM-Weather is a free lifestyle app developed by Japan Radio Co.Ltd. It is designed for individuals who are interested in marine weather conditions. The app provides users with up-to-date weather maps, forecast maps, and typhoon information. It also overlays meteorological and oceanographic data such as rainfall, wind direction, wave height, wave period, wave direction, marine warnings, sea temperature, ocean currents, salinity, and sea surface height onto the weather maps and typhoon information. This allows users to quickly grasp the surrounding meteorological and oceanographic conditions.

One of the standout features of JM-Weather is the "Precipitation Nowcast Information" that is updated every 5 minutes. This feature is especially useful for individuals on land, as it provides real-time information on heavy rain showers, enabling users to take necessary precautions.

The app offers a variety of functionalities, including the ability to view past weather conditions, forecast weather maps for the next 24 to 48 hours, and real-time updates on typhoons. Users can also choose to overlay different layers of meteorological and oceanographic data onto the weather maps for a comprehensive understanding of the current conditions. Additionally, the app provides two display modes: "Head-Up Display" for easy navigation while sailing and "North-Up Display" for optimal usage on land.

Please note that the weather and oceanographic data provided by this app are sourced from the Japan Meteorological Agency. The app requires network connectivity to function properly, and it may experience occasional display issues depending on the device used. The "Head-Up Display" feature relies on the device's compass and may be affected by magnetic interference.

JM-Weather is a valuable tool for anyone interested in marine weather conditions, offering a wide range of features and reliable data. It is available for iPhone devices running on iOS 8.0 or higher.