One screen for the morning call: hourly wet bulb globe temperature for your field, translated into your state's activity flags — rest ratios, equipment limits, practice caps — with a card you can drop in the team chat.
Enter a ZIP or tap the location button. We pull the National Weather Service hourly WBGT forecast for your exact grid cell; where NWS doesn't publish WBGT (parts of central Texas, for example) we model it from temperature, humidity, wind and cloud cover using the Liljegren method and mark it ESTIMATED. Then your selected policy — Texas UIL Class 2 or 3, Georgia GHSA, or the NATA example guideline — turns each hour into a flag.
Field studies show remote WBGT estimates read about 1 °C low on average versus an on-site meter, and up to 3 °C low in the hottest conditions — the dangerous direction. WBGT Check flags borderline hours and tells you to plan for the higher category. A forecast plans the schedule; only an on-site reading runs the practice.
Texas UIL explicitly accepts internet-based readings; Georgia GHSA requires a calibrated on-site instrument; other states fall everywhere in between. See the state-by-state table, the Texas UIL guide, and the Georgia GHSA guide for what your association actually requires.
WBGT Check shows forecast-based remote estimates for planning. Remote estimates tend to read LOWER than on-site measurement — treat borderline readings as the higher category and confirm with an on-site WBGT meter before activity decisions. Your association's policy and your athletic trainer's judgment control.