For the starters thank you very much for Meecast!

It looks like wind speeds for Helsinki are really off in Yr.no and Gismeteo, as they seem to always have very high values. For instance currently they show 18 meters per second and 21 meters per second respectively. Most often they are showing wind speeds comparable to storms. If I change units to km/h the problem stays the same.

The Weather Channel shows more believable figures (currently 4 m/s) and it matches closer with Finnish Meteorological Institute (6 m/s).