EntityQ212378· pop 20· linked from 91 articlesfallstreak holeSign in to savelarge gap in cirrocumulus or altocumulus cloudsConnectionsstratocumulusEntitynimbostratusEntitysupercoolingEntitywall cloudEntityinternational cloud classificationEntityAustriaCountrycloudEntityfogEntityartificial satelliteEntityaircraftEntityprecipitationEntitydigital object identifierEntityunidentified flying objectEntityellipseEntitytroposphereEntityevaporationEntityAnn ArborEntitydynamicsEntitystratosphereEntityInternational Civil Aviation OrganizationEntityCategoriesCloudsUnidentified flying objects