雨モニター

雨モニター is a compact radar viewer that visualizes Tokyo Amesh precipitation data on an interactive map, making it quick to see where rain is falling across the metropolitan area. Designed for commuters, urban cyclists, parents and planners who need short-term situational awareness, 雨モニター displays radar frames in ten-minute steps and retains up to 100 minutes of recent imagery so you can review how rain developed and moved through the city in the immediate past. The app focuses on a clear map-first presentation that minimizes clutter while keeping timely radar imagery front and center.

Key Features

雨モニター presents layered radar frames as an overlay on a standard map so you can inspect precipitation at specific locations, streets or neighborhood scales. Time-step playback advances in fixed 10-minute increments, allowing you to play, pause and step through each frame to observe cloud movement and rainfall trends. The app caches the most recent frames—up to the equivalent of 100 minutes—so short-term review is fast and resilient to intermittent connectivity. A simple legend explains intensity colors and a timestamp is shown for each frame so you always know when the observation was captured.

Controls & Interaction

Interaction is immediate: tap and drag to pan the map, pinch to zoom for finer detail, and tap any point on the map to center the view. Playback controls include play/pause, a frame-by-frame step option and a timeline slider that lets you scrub backward through recent frames to inspect the exact sequence of events. When you tap a specific spot the app reveals the latest available frame time for that point, making it easy to compare two locations or confirm whether rain has already passed your area.

Visual Style & Map Layers

The visual design favors contrast and clarity so radar echoes are easy to read over road and satellite base maps. Color ramps for precipitation intensity are chosen to be intuitive and legible at a glance; you can adjust overlay opacity to see map detail beneath radar echoes. Layers are implemented so the radar overlay does not obscure important map labels, and the presentation adapts as you zoom: broader patterns are emphasized at city scale while finer echoes appear at closer zoom levels.

User Experience & Accessibility

Rain monitoring should be fast and dependable, so 雨モニター concentrates on a straightforward, accessible interface without unnecessary menus. Text labels and controls scale with system font settings to support users who need larger text, and the color palette includes combinations that improve readability for those with common color-vision differences. Visual cues such as clear timestamps and animated frame transitions make it easier to follow moving precipitation, and the minimal interface reduces distraction while you check current conditions.

Offline & Data Handling

To help in areas with limited reception, the app retains the most recent frames it has downloaded—up to 100 minutes of imagery—so you can still review immediate past patterns even if connectivity drops. The app refreshes with the Tokyo Amesh feed on roughly ten-minute intervals in normal operation; when connectivity resumes after an outage the cache updates from the latest available frames. Data handling prioritizes small footprints and quick redraws so the map remains responsive on a wide range of devices.

Limitations & Data Source

雨モニター relies exclusively on the Tokyo Amesh radar feed, so coverage is limited to the metropolitan area served by that source and long-term historical archives are not provided beyond the recent 100-minute buffer. The app is a visualization and review tool rather than a forecasting system: displayed information reflects the Amesh observations and is subject to the timing and resolution of that feed. If you need broader regional coverage or lengthy historical records you will need complementary data sources, but for short-term, location-specific radar inspection within Tokyo, 雨モニター offers a focused, low-friction experience.