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Here is an example on what happened when a gust cloud passed over where I live. I have included three sets of data, the first being images of the cloud, second, the Davis Weather Link data and finally the Boltek Storm Tracker data.

Whilst not being dramatic you can clearly see the effect.

Images.

(Canon 10d : ISO 400 : 1/800s : f6.7 : Focal Length 19mm)

(Canon 10d : ISO 400 : 1/800s : f6.7 : Focal Length 19mm)


(Canon 10d : ISO 400 : 1.5s : f6.7 : Focal Length 20mm)

Above: The Gust Cloud seen from three positions.
Images taken at 17:47 (Top) and 17:52 (Middle) 19:47 (Bottom)

Gust Front.

A "Gust Front" is an outflow of cool air from the leading edge of the Cumulonimbus (Cb) Cloud and it is fairly rare to see this unless you get ahead of the storm and are in the right position to experience this front. As the wind prior to the gust front is calm and (say for argument sake) going North as an up draught but the down draughts behind the gust front are going in the direction of the storm and so you get a "rolling" effect, such as your picture.

For example, you know that a storm is close, as the wind goes calm briefly, then a cool wind sets in as the dark cloud bank passes overhead. The wind will become strong for a few minutes and then the heavens open into either hail or heavy rain.

Davis Weather Link Information.

Above: The light area clearly shows the effect, the temperature starts
to drop quite quickly, wind speed rises and the rain follows.

Boltek Lightning Data

Not soon after the thunder storm started producing 11 strikes per minute at its peak rate.

Above: Video frame grabs. MPEG Standard hence the image loss