I built a white noise site which has a load of sounds which can help in a similar way (including thunder): https://ambiph.one https://ambiph.one I find the 'ba

I built a white noise site which has a load of sounds which can help in a similar way (including thunder): https://ambiph.one https://ambiph.one I find the 'bass rumble' and brown noise particularly useful for masking external noise, which I guess is pretty similar to a thunderstorm frequency-wise