Azimuths are based upon a 360 degree circle where 0 or 360 represents a wind coming from the North, 90 represents a wind coming from the east, 180 represents a wind coming from the South, and 270 represents a wind coming from the West.
The wind directional arrows shown with the forecast assumes that north is at the top of your page, east is at the right, west at the left, and south is at the bottom. An arrow pointing to the right would represent a wind forecasted to blow towards the east. An arrow pointing straight down the page would represent a wind forecasted to blow towards the south.