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Weather forecasts do change and forecasts are just forecasts, so it is not unexpected that sometimes the actual realized wind speed will differ from that forecasted for any given time.
Please be sure to check the "wind altitude" setting in the app. NOAA wind speeds are reported at ground level (typically defined as 10 meters / 33 feet above ground). If the app shows higher wind speeds it is probably because it is showing you wind speeds *at higher altitudes*, which you can configure in the Settings tab in the app.