Halesland has the privilege of being sited at one of the longer ridges in the south of England. The ridge runs approximately from north west of the airfield at crook peak alongside the M5 motorway to an area near Wells south east of the airfield.
This means that in a steady or strong south westerly winds, you can expect good ridge soaring. It also means that, due to the airfield orientation, on a good ridge day you must be able to handle a medium to strong cross wind takeoff and landing. In these conditions, expect moderate to strong curl-over and associated wind shear on landing. For this reason, most pilots will be expected to take a check flight if flying for the first time in these conditions.
In a south or south westerly wind particularly, you must be aware that oragraphic lifting can give rise to hill fog ("oragraphic cloud") very quickly, since the site is located within sight of the Severn estuary which is a prolific site of moisture.
Wave can be expected to occur in various conditions at Halesland, notably westerly and northerly. Westerly wave, triggered by the welsh massif and experienced as secondary wave fronts, is sometimes relatively weak. Northerly wave can be difficult to exploit due to the airfield topology, although it can be very good. Southerly wave will occur, but exploiting it is likely to lead to conflict with the controlled airspace of Bristol Internationals ATZ. Easterly wave is not normally encountered, there being few trigger sources east of the site.
Strong north easterly winds make operations difficult due to the site layout and the duty instructor may well suspend flying on these conditions.
Thermal activity occurs all around the site and you can expect it to gradually increase in intensity as you move to the east of the site - i.e. further inland.