Caught out
Two decades ago I was slope/ wave soaring a slope in the lee of mount Brandon in Kerry around 400 ft agl in a phoebus C in which I had replaced the turn and slip with an ex RAF horizon and an inverter. To windward and below I saw a cloud forming so turned into wind and turned on the horizon. Unlike a turn indicator it was unusable for several minutes but fortunately I had a second generation gps which was fast enough to keep the wings level. I was engulfed in cloud within 30 seconds and briefly considered bailing out. A 360 would have seen me impacting the mountain.