Narrow band slices have been taken of the radio emission spectrum from convective clouds in the frequency range from 30 mc./sec. to 550 mc./sec. and a t 7.5 kc./sec. to monitor long and short range lightning discharges. Despite the careful choice of the bands to avoid interference from manmade sources, a major problem is the identification of spurious noise. I n spite of these interferences, ra...

There are three underdeveloped components of urban cloud-to-ground lightning studies: (1) the integration of multiple flash descriptors into more informative summary metrics of flash production, (2) the comparison of flash patterns by thunderstorm type, and (3) the correspondence of urban flashes with underlying land use. We used a GIS to integrate these components as part of an analysis of war...

Analyses of wind velocity and air pressure data, acquired by a set of lowlevel anemometers at Sydney Airport, Australia, indicate the passage of a set of three remarkably smooth atmospheric boundary-layer oscillations that travelled ahead of a thunderstorm on 27 December 1991. The oscillations were probably generated by a nearby thunderstorm out ow, propagating into a stably strati ed atmospher...

Thunderstorm tracks in the eastern Alps for the summers of 1993–1999 are investigated based on lightning data. The tracking method consists of three steps. Step one filters weak storms. Step two fixes the positions of the single cells, which are then connected. The wind at 700 hPa, which approximates the steering level of the thunderstorms, is used to distinguish between six weather patterns. M...

The solitary waves that have been observed in the atmosphere fall broadly into two classes: those that propagate in a fairly shallow stratified layer near the ground and those that occupy the entire troposphere. We present a survey of the observations of both types of solitary waves. The generation mechanisms differ substantially for these two types of solitary waves. Those that propagate in a ...