Windy API is Leaflet 0.7.7 at the moment.
Near future it will be updated to 1.4
Windy.com main site was updated to 1.4 few weeks ago.
Unit is bft not knots
@Radek-M, adblockers block this request: https://node.windy.com/node/geoip?source=testConnection and then this red offline bar appears.
"geoip" needs to be renamed to something else to avoid blocking.
Try using different weather models at bottom right corner:
Different models offer best results in different locations.
Find your most accurate model in your area.