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Why fishing forecasts change: updates, lead time and missing data

A forecast is information available at a particular time about a later time. Read both dates before deciding whether two screens actually disagree.

By FishMeteo Published

Separate the time being predicted from the update

The date on an hourly row tells you when the forecast applies. A record-update time tells you when the supplied record changed. In the FishMeteo public pages, the page-generation time is shown separately; opening a newly generated page does not prove every forecast record is new.

Expect uncertainty to change with lead time

Small differences in the starting conditions can grow as a forecast extends further ahead. Use a longer view for an initial plan, then check again nearer departure rather than treating every day as equally certain.

Compare like with like

Keep the spot, date, hour, field, unit and listed source or model together. Check those before comparing screenshots from different services. A missing field means information was not supplied; it is not proof of calm seas, no rain or zero wind.

Keep enough context to revisit your decision

Save the place and note when you checked the forecast, which hours you chose and what would change your plan. After the trip, add observations. That record is more useful than a screenshot with no date or location.

Try it on your next trip

  1. Check forecast date, record update and page generation separately.
  2. Recheck the same spot and hours before departure.
  3. Keep missing values unknown and record the forecast-check time.

Put it into practice