A useful starting point
Keep the opening entry descriptive. Approximate time, visible surroundings and changes from the plan form a useful start. Separate an official forecast from what you observe at your lawful safe viewpoint. A notebook is not a substitute for current safety guidance, but it can make later recollection more honest.
Try this sequence
- Date the entry on arrival
- Write the viewpoint and direction
- Separate forecast and observation
- Leave unknown details as questions
A small worked example
Your opening entry might contain the time and a visible change in cloud cover. Keep the forecast source on another line. This avoids presenting a remembered forecast as something you personally observed, and makes the note easier to compare after the outing.
What to keep in your notes
Keep your first version of the plan beside the revised one. For this task, the useful question is simple: did “leave unknown details as questions” leave you with a clearer next step? Record the answer without turning it into a prediction of conditions or results.