Abstract: The probability is determined that an aircraft will encounter moderate or severe high-level turbulence during a 100-mi. flight segment when particular values of certain meteorological quantities exist in that locality. The ...

Abstract: Regions of clear air turbulence in the upper troposphere and lower stratosphere are classified into four groups, and the characteristics of each group are summarized. An empirical turbulence index is defined that describes ...

Abstract: This study describes objective analysis of the atmospheric conditions that precede or accompany severe thunderstorms and tornadoes. The data used are standard rawinsonde observations and hourly surface reports as they are ...

Abstract: A cloud simulation model that is based on a Monte Carlo method was developed for testing and designing automatic ceilometer systems. With this model, cloud plan views and profile views an generated for several different ...

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Abstract: A computer simulation program was used to investigate the sampling problems that are associated with using automated instrument systems to determine cloud amount. The simulated cloud conditions were generated in the computer ...

Abstract: A method is presented for combining remotely measured temperature soundings and wind data to provide a pressure-height reference level in the upper troposphere. In an initial phase of the study, balanced heights over North ...

Abstract: Distributions of relative vorticity and balanced height are computed from the cloud velocities associated with the cloud structure of an extratropical cyclone over the continental United States during a three-day period ...