In a previous study Reiter and Mahlman (1965a) have estimated the amount of stratospheric air intruding into the stable layer of the jet stream front in a case of cyclogenesis not accompanied by surface radioactive fallout. In the present report the same case is examined on a more general basis. Outflow form, as well as inflow into, the stratosphere is estimated over the entire thickness of the "tropopause gap."

The erosion and subsequent mixing to the environment of the updraft of mesoscale convective clouds is examined and modeled as a mechanism for the thermal modification of the cloud environment.

Characterizes the static environment of middle and upper tropospheric clouds as deduced from rawinsonde data from 24 locations in the contiguous U.S. for 1977.

The strong horizontal gradients of the kinetic energy spectra in frequency space determined in this study suggest that a regional treatment of the multivariate kinetic energy equation will have to contend with a careful evaluation of boundary flux terms.