To catch the thunder, the most important part is to protect your recording gear. Thunder comes with lightning, and lightning often comes with rain or heavy rain. The first thing that you need to protect is your microphones. In my case, I put them underneath the railing on my deck.

Once these microphones are protected, it is time to protect the recorder.
In my case, the recorder is a small Zoom F3. I purchased a set of “dry bags” a while ago from Amazon, and these come in handy for exactly this type of recording.

