How to read an Adriatic wind and gust forecast

Read more than the wind number

A useful wind check brings together direction, average speed, gusts, place and time. A single number leaves too much out. Use this guide to interpret a forecast, then consult the current official marine bulletin and warnings for your area. This is educational guidance, not a departure recommendation or a navigation plan.

Start by writing down the location and the hours you actually need to understand: departure, the time away and the return. A forecast for the nearest town and a forecast for an offshore leg answer different questions.

Separate average wind from gusts

The average wind value describes the expected mean speed; gusts describe short stronger bursts. They are not interchangeable. The Met Office explains that its gust value is the highest forecast speed in the interval before the next forecast time. Check the legend of the service you are using, because time intervals and presentation can differ. Source: Met Office forecast guide.

Illustrative example: a row showing 12 knots of wind and 24-knot gusts is not a steady 12-knot forecast. Record both figures rather than copying the smaller one into your notes. These invented numbers demonstrate how to read a row; they do not define acceptable conditions for any vessel.

Check where the wind comes from

A named wind direction describes where the wind comes from. NE means wind from the northeast. An arrow can show movement instead, so read the legend before interpreting its orientation. The Met Office illustrates this distinction between its direction letters and arrows in its forecast guide.

On your own planning sheet, write the direction in words beside each relevant time. This makes a predicted change easier to notice than a sequence of small arrows. Do not assume an unchanged speed means unchanged conditions when the direction changes.

Match the units, place and time

• Units: compare knots with knots, or convert before comparing. Do not compare a km/h figure directly with a knot figure.
• Place: confirm the selected point or named forecast area. Include the areas between your starting point and destination.
• Timing: check the issue time, forecast date, timezone and the interval each value represents.
• Change: read the surrounding hours rather than picking the most favourable row.

Our suggested note format is: area, valid period, average wind, gusts, direction, source and time checked. Keeping these fields together makes differences between two forecasts visible.

Read the regional marine bulletin alongside the app

DHMZ publishes a Marine Forecast for Small Crafts with a warning, synopsis and successive forecast periods. Read the regional qualifications as well as the headline. The bulletin also includes sea and visibility information; wind is only part of the picture.

When a point forecast and a warning appear to disagree, keep both in view and investigate the area, time period and issue time. Do not discard a warning because one app row looks calmer. Desta can provide context for reading weather information; it does not replace official warnings, current charts or the skipper's judgement.

A quick reading checklist

1. Confirm the location, date, timezone and units.
2. Write down average wind and gusts separately.
3. Read direction changes across the whole period.
4. Open the current official marine forecast and warning details.
5. Keep the source and check time with your notes, then check for updates.

For the wider picture, continue with planning with marine forecasts and official warnings, or learn about Desta.