Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For First Responders · Psychrometrics

Psychrometrics for a lightning strike

Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate a lightning strike live below — adjust the inputs and watch it respond, right in your browser.

Humidity & PsychrometricsLive

dew point, wet bulb, mixing ratio

25°

dry bulb

18°

wet bulb

14°

dew point

These three temperatures fully describe the moisture in the air.

Controls

Presets

Air temperature (°C)

Relative humidity (%)

Relative humidity alone is misleading. The dew point — the temperature at which air saturates — is the honest measure of how muggy it feels and where clouds or condensation form. The wet-bulb temperature, always between dew point and air temperature, is what evaporative cooling can reach and a key limit for human survivability in extreme heat.

▶ Run in Python

Data Inspector

Dew point13.9 °C

Wet-bulb temp18.0 °C

Mixing ratio9.9 g/kg

Comfortpleasant

Governing equation

W = 622 \frac{p _{w}}{p - p _{w}} = 622 \times \frac{15.8}{1013 - 15.8} \approx 9.9 g/kg

Reading this result: Dew point 13.9 °C sits in the pleasant range; the wet bulb (18.0 °C) marks the coolest that evaporation can reach here.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Frequently asked questions

Is this good for first responders?: Yes — this version of "Psychrometrics for a lightning strike" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.