FORMS OF UPPER SURFACES OF CLOUD LAYERS AND THEIR RELATION TO THE TEMPERATURE LAPSE RATE IN CLOUDS,
WEATHER BUREAU WASHINGTON D C
Pagination or Media Count:
The temperature lapse rate is closely connected with the degree of unevenness, that is, the more or less convective character of the upper surface of clouds. The development of unevenness and the lapse rate increase in parallel fashion. This dependence is most sharply pronounced with type A clouds under a layer of other clouds. With type B, sub-inversion cloudiness, it is weaker, but on the other hand more regular. With type C clouds, without an inversion, the lapse rate in their layer is smallest. Undulating and hilly clouds are encluntered more often than slightly undulating and slightly hilly with the exception of cases in which clouds are located under a layer of other clouds. The organization of a number of airplane soundings and systematic observation station for a view of the upper surface of clouds should be considered expedient, paying particular attention to the precise definition of flat, greatly undulating, uneven or inhomogeneous surfaces. In addition it should be recalled that with a low coverage of cloud surfaces, they seem to be flatter than in actuality.