EntityQ2556428· pop 5· linked from 15 articlescol pointSign in to saveIntersection of a trough and a ridge in the pressure pattern of a weather mapConnectionshumidityEntitycloudEntitywindEntitylightningEntitytemperatureEntityInternational Standard Book NumberEntityvelocityEntityfogEntitypressureEntityprecipitationEntitythunderstormEntityatmospheric pressureEntitywater vaporEntitysaddleEntitycondensationEntitysunlightEntityadiabatic processEntitybuoyancyEntitydew pointEntitycontour lineEntityCategoriesAtmospheric circulation