Only the current version so far — new entries appear as the app ships updates.
雷アラート - お天気ナビゲータ is a weather app by 日本気象株式会社 with 10,000+ downloads (about 40K estimated). +2 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “An app that notifies you of the approaching lightning! When a thunderstorm is expected to approach the set municipality, a pop-up or notification bar will notify you.”