雨降りアラート is a free Android application developed by 日本気象株式会社. It falls under the Lifestyle category with a subcategory of Weather. The app's main purpose is to provide users with alerts and notifications when rain (or rain clouds) is expected to approach the user's designated area. The alerts can be in the form of pop-up messages or notification sounds.

One notable feature of 雨降りアラート is its compatibility with Android Wear smartwatches, where users can receive rain notifications along with radar images. This allows users to stay informed about the weather even when they are wearing a smartwatch.

In addition to rain alerts, the app also provides access to weather information such as rain cloud radar and pinpoint weather forecasts through the "お天気ナビゲータ" website.

Please note that as of November 2020, the app is no longer supported for updates or bug fixes. However, users can continue to use the app as it is, but it may not be compatible with newer operating systems.

Overall, 雨降りアラート is a useful app for those who want to stay informed about approaching rain and make necessary preparations.