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Known as Altocumulus Standing Lenticularis (ACSL), these clouds are associated with waves in the atmosphere that develop when relatively stable, fast moving air is forced up and over a topographic barrier. When sufficient moisture is present above mountain-top level, these clouds develop on the upwind side and dissipating on the downwind side. That is why they appear to remain stationary (hence the name) even though winds are swiftly moving through the entire cloud. To learn more about clouds go to JetStream - an Online School for Weather.