April 2008, and a strong gust-front surges south (R-L) across Cardigan Bay. Technically, what's going on is that cold air,
chilled from the downpour (mostly out-of-view R) is descending from the upper part of the thundercloud and fanning-out
away from the storm upon hitting the surface. The cold air's the clear slot higher than the normal cloudbase R. As it
travels along in a wedge-shape, it lifts the warmer ambient air around the storm: that air is then itself chilled and its
moisture condenses to form the rather scalloped wedge of cloud whose leading edge is almost dragging the ground.
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