- Long billows of brooding clouds due to a passing wave train
- W005759Z
- Billows of brooding clouds over mountains inspire a meditative mood. These large, long cloud strips are probably a set of lee wave clouds. The sheet was initially uniform. Once the wave induced lift in the crests, the strips became unstable (Castellanus) and the bases darkened. A short while later and the sheet returned to normal as the passing wave train moved on.
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