Roku Inc. is pleased to announce the release of our in-house mobile app "Heatstroke Alert (WBGT Forecast)" on the App Store and Google Play.
About Heatstroke Alert
"Heatstroke Alert (WBGT Forecast)" is a heatstroke prevention app that lets you check the Wet Bulb Globe Temperature (WBGT) anywhere in Japan, hourly, up to 7 days ahead. Powered by our in-house machine learning forecast engine, it helps you prepare before dangerous heat arrives.
Key Features
- 7-Day Forecast: Check WBGT nationwide, hourly, up to 7 days ahead
- No Registration Required: Ready to use right after installation
- Risk Map: See nationwide heat risk at a glance
- Hourly Forecast: WBGT graphed together with temperature and weather
- 4 Risk Levels: Normal / Caution / Severe Caution / Stop Work, shown intuitively with colors and emoji
- Advance Notifications (Free): Push alerts about 3 hours before a favorite location reaches dangerous heat
- Business Features: Automatically updated 7-day forecasts and alerts for registered job sites
What is WBGT?
WBGT is the international standard index for heatstroke prevention, calculated from temperature, humidity, and radiant heat. At the same air temperature, higher humidity means higher risk. The app presents easy-to-understand guidance for daily life and outdoor work based on Japan's Ministry of the Environment standards.
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Built with Flutter for both iOS and Android, backed by Django REST Framework and an in-house forecast engine powered by machine learning (Temporal Fusion Transformer).