On the rails
Log lightning and thunder in order, see the lag, and keep a short history of the current watch.
Train Approach
A compact field notebook for marking flash and bang, keeping a watch on how a cell is closing, and storing distances on the phone.
On the device
Entries you add stay on the phone unless you export or share them. There is no store inside the app.
Not a forecast
Train Approach is a personal log. It does not replace weather alerts or official warnings.