Outdoor Heat Stress Planner
Compare a heat-index estimate with an independently measured-sensor WBGT calculation.
Your heat conditions inputs
Heat index represents shaded, light-wind conditions and is not WBGT.
Load a location forecast optional
Manual example inputs work without a connection. Forecasts need a licensed location-data key set by the administrator.
Weather: Open-MeteoAir quality: CAMS. Place names: GeoNames. Pollen forecasts cover Europe during the supported season.
Heat conditions report
37.07 °C · NWS heat-index estimate
Shade/light-wind model, not measured WBGT
Full result table
| Measure or contribution | Value | Unit |
|---|---|---|
| Air temperature | 32 | °C |
| Heat-index estimate | 37.074284 | °C |
Heat index represents shaded, light-wind conditions and is not WBGT. WBGT mode requires actual natural wet-bulb and globe readings; the weather loader cannot supply those sensors. No personal work/rest schedule, exertion clearance or core temperature is inferred.
Let’s work it out.
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How to use Outdoor Heat Stress Planner
- Compare a heat-index estimate with an independently measured-sensor WBGT calculation.
- The NWS method starts with a preliminary calculation and applies the regression and humidity adjustments only in their stated conditions.
- The result names the selected measure and keeps heat index and WBGT labels distinct.
Worked example
With natural wet bulb 26°C, globe 34°C and air 32°C, outdoor WBGT is 28.2°C. This is not obtained from the heat-index formula.
Formula, accuracy & limitations
NWS heat index uses the preliminary Steadman approximation, Rothfusz polynomial when appropriate and the published low/high-humidity adjustments. Outdoor WBGT = 0.7 natural wet bulb + 0.2 globe + 0.1 dry-bulb temperature. The two measures remain separate.
Heat index represents shaded, light-wind conditions and is not WBGT. WBGT mode requires actual natural wet-bulb and globe readings; the weather loader cannot supply those sensors. No personal work/rest schedule, exertion clearance or core temperature is inferred.
The primary result is rounded to two decimal places. Calculation tables show up to four and supporting metrics up to six. Very small nonzero values use scientific notation. Display rounding is not fed back into the arithmetic.
Official source and method context ↗Choose the measure you actually have
Compare a heat-index estimate with an independently measured-sensor WBGT calculation. Heat-index mode needs air temperature and relative humidity. WBGT mode needs natural wet-bulb, globe and dry-bulb temperatures; a forecast wet-bulb estimate is not silently substituted for a natural wet-bulb sensor.
Respect the formula scope
The NWS method starts with a preliminary calculation and applies the regression and humidity adjustments only in their stated conditions. It describes shaded, light-wind conditions. Direct sunlight, hot surfaces and exertion can produce a different thermal burden, so the page does not rename the result an outdoor safety score.
Compare like measures
The result names the selected measure and keeps heat index and WBGT labels distinct. The component view for WBGT displays the weighted sensor contributions in degrees Celsius. Changing a mode does not make a sensor reading appear; entered values remain visible and must be checked against the selected method.
Use the report as environmental context
Location loading fills supported air-temperature and humidity fields and selects heat-index mode. It does not authorise a workout or determine a person’s tolerance. Clothing, acclimation, health and task intensity are outside the calculation, and no medication or heat-treatment recommendation is generated.
Frequently asked questions
Can temperature and humidity give measured WBGT?
They do not provide the required natural wet-bulb and globe sensor readings. This page keeps that limitation explicit.
Does the forecast loader fill WBGT sensors?
It loads supported weather inputs and selects heat-index mode. It never fabricates globe temperature.
Why can heat index differ from air temperature?
The model includes humidity’s effect under its defined conditions; it is not a measured body temperature.
Does a lower value certify safe work?
No personal work/rest limit or exercise clearance is calculated.
