Figure 4: The annual climatological probability of the wind speed to be found within the given range of wind directions. The analysis is based on the IGRA data archive for the Ny-Ålesund stations. The probabilities are shown at four pressure levels: the surface (a), 925 hPa (b), 850 hPa (c), and 700 hPa (d). The black bars correspond to the total probability, and the white bars to the probability of the strongest winds (the wind speed belongs to the top quartile). The gray strips indicate the direction of the valley.