PracticeHeat
A WBGT-driven practice planner for youth-sport coaches, athletic trainers, and outdoor-activity leaders that auto-cancels or modifies sessions and notifies parents.
youth-sports coaches, athletic trainers, and outdoor-program leaders in Japan who need defensible heat-safety decisions
- Hour-by-hour WBGT forecast at the practice field with auto-flags at 28 / 31 thresholds
- Pre-built activity modifications (water-break cadence, shade drills, shortened sets) by sport and age group
- Parent-facing notifications with the day's planned adjustments and reason
- Exportable incident log to defend decisions in case of a heat-illness claim
Japan just hosted a World Cup where ~20% of matches hit WBGT 28+, and searches for 'wbgt' are spiking nationally as the country debates outdoor-event safety under intensifying summers.
Japan has thousands of annual heat-illness cases in school sports club activities (Springer), baseball alone caused 37 heat-related school deaths, JFA updated its heat guidelines in May 2024, and MEXT/JSPO issued 2025 sports heat-prevention guidance — institutional pull is strong.Proposing adjustments to heat safety thresholds for junior high and high school ↗Heat Illness Prevention Information: WBGT Guideline (Japan MoE) ↗MEXT 2025 sports heat-illness prevention document ↗
Several Japan-facing tools already occupy the WBGT-data niche: env.go.jp official WBGT map, tenki.jp WBGT近似値 portal, novasolver.jp WBGT calculator, and a commercial 'WBGT App' by Everade on Google Play — leaving the specific coach-workflow + parent-notification + auto-cancel wedge narrow.WBGT App on Google Play (Everade) ↗tenki.jp 熱中症情報（WBGT近似値） ↗WBGT Heat Index Simulator — NovaSolver ↗
Most WBGT information is free from the government and tenki.jp; youth coaches are often volunteers or low-budget clubs, limiting per-coach willingness to pay — defensibility/liability value exists for schools and leagues but B2C conversion will be weak without employer or league sponsorship.Official free WBGT monitoring from Japan MoE ↗Free tenki.jp WBGT-approximation heatstroke portal ↗
Japan summers are intensifying from climate change and the government is codifying mandatory WBGT-based practice rules (MEXT/JSPO/JFA), making this a structural multi-decade regulatory tailwind rather than a fad.Springer: thousands of annual heat illness cases in Japan school sports ↗少年野球の熱中症ガイドライン解説 (baseball heat-death data) ↗
Public WBGT data (env.go.jp, tenki.jp) and weather APIs are readily available, but building regulator-grade WBGT ingestion, Japanese-language UX, and LINE-native parent notifications adds meaningful localization work.Official env.go.jp WBGT monitoring station data ↗tenki.jp WBGT-approximation data feed ↗