If there's a thunderstorm try these:
- Time how long it is between a lightning flash and the following thunder and see if it's getting closer.
- Multiply the seconds between the lightning and thunder by the speed of sound - and you'll know how far away each lightning strike was.
- Using a decibel app, measure how loud the thunder is and see if it's getting louder.
- USe a light meeter and see if the lightning is getting brighter.
- Keep recording the distances, and loudness, and plot them. You could figure out the speed the storm is moving and loudness at different distances.
- Look up 'thunder' in the Bible - see what you find.