A transatlantic weather plan is not a single departure forecast. It is a repeatable process for updating a route-wide picture as the vessel moves, forecast skill changes and new warnings appear. This checklist is educational; it does not recommend a season, track or departure date for a specific boat.
Before choosing a departure window
- Write down the proposed track, conservative speed range, fuel and crew constraints, communication capability and realistic alternatives.
- Identify the coastal, offshore and high-seas forecast areas from departure to arrival; use the WMO/IMO METAREA directory and each issuing national service.
- Check warnings first, then the broad pressure pattern and its trend, wind/gusts, seas and swell, visibility and tropical information where applicable.
- Compare more than one model, but keep the official warning picture separate. A route optimiser’s fastest track is not automatically the most comfortable or appropriate route.
- Record the validity of every forecast, the next update time, trigger points for reconsideration and a backup means of receiving information.
During the crossing
Repeat the brief at a planned interval and whenever observations or warnings diverge from the expectation. Save a compact text version for limited bandwidth. Note the source and UTC time of each new product so an older forecast cannot quietly replace a later one. If the data stream fails, display that failure explicitly; a stale model image must not look current.
For eastern and western source discovery use the North Atlantic guide. Arrival in the Caribbean or along the US East Coast requires fresh coastal products in addition to the ocean forecast.
Source check: 24 September 2026. The skipper, current official warnings, suitable communications and professional advice where needed remain central to the actual decision.