SUP, kayak and open-water swimming groups: the wind call, at your height

As a club officer or swim group organiser, you decide whether the wind is offshore or too strong for paddling or swimming at your chosen beach today. This decision is made before each outing, and it directly affects the well-being of your group. A wrong call can lead to dangerous situations, such as paddleboarders being caught by offshore winds and requiring rescue services.

Your judgement is based on the wind's direction and speed at the surface. The Wind Agent instrument shows you the wind at 10 metres, interpolated to your working height, and provides gusts alongside the mean wind speed. This information helps you assess the conditions accurately.

Having clear, real-time wind data allows you to make an informed decision for your group. The instrument does not make the call for you; it provides the data you need to apply your experience and your group's protocols. This ensures that every outing is as well-managed as possible for everyone involved.

For SUP, kayak, and open-water swimming groups, the critical factor is the wind at the surface. The Wind Agent instrument provides wind data at 10, 80, 120, and 180 metres. For your activities, the instrument interpolates the wind data to your specific working height, which you can set to match the conditions at the water's surface.

It is important to distinguish between mean wind speed and gusts. Gusts are short, sudden increases in wind speed that can be significantly stronger than the mean wind. For paddlers and swimmers, these gusts can be particularly challenging, especially if they are coming from offshore. The instrument displays both the mean wind and the associated gusts.

Your limit for operational conditions, such as a maximum Beaufort Force, is set by your own club's guidelines or national body recommendations, like those from Canoeing Ireland. You enter this limit into the instrument, which then helps you assess whether current or forecast conditions exceed it. Always refer to your own document for the exact thresholds.

The Wind Agent instrument provides a probability, P(above your limit), by the hour. This is computed from ensemble members at 10, 80, 100, and 120 metres. It shows the fraction of ensemble members that predict wind conditions exceeding your pre-set limit for that specific hour. This is not a calibrated certainty, but rather a direct reflection of model agreement.

The Agreement Spine feature shows you where the weather models agree and where they do not. When models largely agree, the forecast is more reliable. When they diverge, the uncertainty is higher, and you might need to exercise more caution.

For example, if P(above your limit) is around 20 per cent, it suggests a low chance of exceeding your limit, allowing you to proceed. If it is around 50 per cent, the conditions are borderline, and you might consider a more sheltered location or postponing. At 80 per cent or higher, the risk is substantial, and cancelling the outing would be prudent. These percentages serve as guidance, and your decision should always align with your group's protocols.

Here is an example of how you might use The Wind Agent for an outing:

• 07:00: Check the morning brief. The forecast for your beach shows offshore winds building from Force 1 to Force 3 by midday. P(above your limit) is 10% at 09:00, rising to 30% by 11:00.
• 08:00: You arrive at the beach. The measured wind is light, Force 1, and onshore. You confirm the group is ready for an early start.
• 09:30: The instrument shows the wind shifting to offshore, now at Force 2. P(above your limit) is 25%. You decide to keep the group close to shore.
• 11:00: The forecast shows P(above your limit) at 40% for the next hour, with gusts reaching Force 3. You call the group back in, as conditions are approaching your limit.
• 12:00: The wind is now consistently offshore at Force 3, with P(above your limit) at 60%. You decide to pack up and call off any further activities for the day, ensuring everyone's well-being.

Your operational limit for wind speed and direction is a critical parameter. This limit should come directly from your own group's document, club guidelines, or national body recommendations. For instance, Canoeing Ireland's sea kayak Level 1 conditions recommend Force 0 to 2 Beaufort. You will type this specific limit into the instrument.

The instrument is preset to consider wind at 10 metres, but you can adjust the working height to better reflect conditions at the water's surface for your activities. This allows you to tailor the data to your specific needs, whether you are paddling or swimming.

It is essential to consult your documentation regularly and update your limits in the instrument if they change. The instrument acts as a tool to help you monitor against these established thresholds, ensuring you always operate within your defined parameters. It supports your decision-making by providing a clear comparison between forecast conditions and your acceptable limits.

The Wind Agent provides a dated record page of what was forecast, what was observed, the limit you used, and the call you made. This record is important for several reasons, especially for a club officer or swim-group organiser.

After an outing, if questions arise about the conditions or the decisions made, this record provides an objective account. It shows that you consulted reliable data and made a considered judgement based on the information available at the time. This can be crucial for internal reviews or, in rare cases, for external inquiries.

Keeping a clear log of wind conditions and decisions helps you refine your understanding of local weather patterns and how they affect your specific activity locations. It also serves as a valuable resource for training new officers or group leaders, demonstrating good practice in risk assessment and management. This record confirms due diligence in planning and executing your group's activities.

Ireland's coastal environment, particularly its Atlantic exposure, means that wind conditions can change rapidly and significantly. The storm season typically runs from October to March, but strong winds can occur at any time of year. For SUP, kayak, and open-water swimming groups, the summer months, generally May to September, are the most active season, yet even then, offshore winds can pose a risk.

Offshore winds are a particular concern for paddle sports and swimming, as they can quickly carry individuals away from the shore. Met Éireann, as the national forecaster, provides general weather information, but local, height-specific wind data is vital for water-based activities.

Understanding both the speed and direction of the wind is paramount. The Wind Agent helps you assess these specific conditions at your chosen location, allowing you to make informed decisions that account for Ireland's variable coastal weather. This local insight complements broader national forecasts, providing the precision needed for well-managed group activities.