Abstract: Riming growth rates for graupel and frozen raindrops are compared with those of unfrozen drops growing by coalescence. The results indicate that graupel can have a considerable advantage over unfrozen raindrops in regions ...

Abstract: The importance of multiple cycles of raindrop growth and breakup in the evolution of warm rain is limited by the time required for breakup fragments to grow back to breakup sizes and, if the updraft is not strong enough ...

Abstract: Cloud-base temperature is an important, but often neglected, parameter in the activation of cloud drops. Other factors being equal, clouds with colder bases will activate more condensation nuclei than clouds having warmer ...

Abstract: This note compares and evaluates the analytical solutions of Squires and Twomey for cloud droplet concentration. Either solution is likely to be fairly accurate (±30%) when the slope parameter (?) of the cloud condensation ...

Abstract: Giant and ultragiant aerosol particles can play an important role in warm rain initiation. Recent aerosol measurements have established that particles as large as 100 ?m are a regular part of the atmospheric aerosol. When ...

Abstract: No abstract available.

Abstract: Multiple-parameter radar measurements involve the combination of several different radar measurements, such as reflectivity measurements at different frequencies or polarizations, into a single parameter. Prediction of the ...

Abstract: The transition between wet and dry growth for graupel and hail is examined, and new figures are presented illustrating the critical water contents necessary for transitions into or out of the wet-growth regime. These figures ...

Abstract: When raindrops collide, some of the kinetic energy involved in the collision will be available to initiate or sustain oscillations in the surviving drops. This paper presents results of a simple model of drop collisions ...

Abstract: The properties of 3 cm radar first echoes were used to study the effects of the St. Louis, Missouri metropolitan area on precipitation initiation during the summer months of Project METROMEX. Good statistical support was ...