Strangely this is the hardest wind direction to deal with well. First I'll explain how to deal with it then I'll explain why it's so awkward.

On the backcast we must cast below the horizontal, otherwise the wind will get beneath the flyline and blow it back towards the caster. It is essential, for obvious reasons, to cast a tight loop on this backcast. On the forward cast an open loop is, not only acceptable, but also an advantage (as the wind can get inside the loop and assist in carrying it out - it's a bit like a sail). The entire cast is tilted backwards and the angle of cast is made above the horizontal on the forward cast.

The reason that this wind direction is such a bitch, is because often that low, tight backcast hooks the grasses behind us. It is especially difficult because a powerful cast has that tendency to kick the end of the flyline downwards - the only solution I can offer is to send a horizontal loop into the backcast (a la Belgian cast) or an upside down one (pendulum cast).

Obviously one key to the efficiency of this cast to stick a late haul into the backstroke in order to get that narrow loop. If it's really windy there are times when you just are not going to get your hauling hand back up in preparation for the forward haul. Under these circumstances the only recourse is to make a very precise sharp wristy-haul on the forward cast.

Under these circumstances the forward haul is not so important anyway. One instructor I know called this the 'finger' haul. It's very useful for loch style fishing BTW.

As an aside:- there is a dam where I do a fair amount of angling, and when the wind is up for it, it can blow at you both ways: over the top and in your face (tight loops both ways and crossed fingers).