Thunderstorm distance

Thunderstorm distance helps you estimate how far a storm is by measuring the delay between lightning and thunder. Thunderstorm distance provides a simple tap-based timer and a distance calculator that converts the seconds between flash and sound into an estimated distance. Thunderstorm distance also logs recent measurements so you can review past estimates.

How it works

Start the timer when you see a lightning flash and stop it when you hear thunder. The app converts the elapsed seconds into distance using the speed of sound with an option to switch between kilometers and miles. Results are estimates that depend on local conditions and temperature.

Features

• Tap-based stopwatch for timing flash-to-thunder delay
• Automatic conversion to distance (km or miles)
• Optional temperature adjustment for improved estimate
• Simple history of recent measurements
• Clear display and easy controls

Accuracy and safety

Distance estimates are approximate and affected by temperature, wind, and terrain. Use this app for informal measurements only and follow official weather warnings and guidance from local authorities for safety during storms.