You save a forecast at lunchtime and reopen it the following morning. The screenshot still looks current because the weather symbols have not changed. Its usefulness depends on the dates around those symbols, not the moment you happen to look at them.
Read two clocks
One time tells you when information was issued. Another describes the period it covers. A forecast may also include an outlook beyond that main period. Keep those fields separate in your notes.
The Met Office coast-and-sea guide explains the periods used by its marine products. Consult the current product itself for its issue details and coverage, rather than copying a schedule from an old article.
Try a deliberately incomplete example
Imagine a saved note reading “Tuesday, wind increasing later”. Which Tuesday? Later than what time? In which time zone, and for which area? The note cannot answer those questions even if the original forecast could.
Rewrite the note with the product name, area, issue date and time, covered period, and source link. If you cannot recover a field, mark it missing and retrieve the current forecast.
For an actual passage, use the appropriate current official marine information and the skipper’s planning process. This exercise is about reading timestamps correctly. The same habit helps when checking labels on a tide table.