Ac undulatus

Beautiful set of altocumulus clouds which seem to have been on 2 layers of the atmosphere being the same sub-species, undulatus. The one on the church seems to resembles the formation of a cumulonimbus anvil but composed of mid-level clouds. These seems to have been formed due to somewhat increasing instability as the cold front was approaching combined with speed shear as shown on the weather sounding in the first thumbnail. On the surface, winds were light but at an altitude of 10km, the wind speed was a roaring 87 knots changing direction slightly but rapidly increasing with altitude.

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