Read the whole picture
Check the official local forecast and warnings, not just a wind-speed number. Note wind direction, gusts, changing weather and the wider trend. For water sessions, include tides and currents; for flying, follow your training and local site guidance.
Watch what changes
Compare the forecast with observations at the site and advice from qualified local people. Conditions may differ between the launch, the water and the air above. An app is an input, not permission to go.
Keep the option to walk away
Agree suitable conditions and limits with your instructor. If the forecast is uncertain or the real conditions differ, pause and reassess. No session is owed to us. There will be another weather window.