Studies of the Requirements for the Numerical Simulations ofMesoscale Rainbands Forced by Conditional Symmetric Instability

温带气旋主导着温带地区的天气和降水。 降水模式通常呈带状结构。 锋面雨带的水平尺度范围从沿着冷锋的几公里到在锋面系统的暖区和冷区都观察到的几十公里。 人们提出了几种理论来解释锋面雨带的组织；目前，条件对称不稳定性似乎能够解释几种类型的雨带。 该学科发展中最重要的下一阶段是在数值模型中实现条件对称不稳定性。 华纳和克拉克教授将使用宾夕法尼亚州立大学的中尺度模型来研究真实模拟雨带结构所需的模型特征。 温带地区收到的大部分降雨与暖锋或冷锋的通过有关。这项工作一旦成功完成，代表着中尺度降水数值预报向前迈出了重要一步。

Extratropical cyclones dominate the weather and precipitation in temperate latitudes. The precipitation pattern is often organized in a banded structure. The horizontal scales of the frontal rainbands range from a few kilometers along the cold fronts to several tens of kilometers observed in both the warm and cold sectors of a frontal system. Several theories have been put forward to explain the organization of frontal rainbands; presently the conditional symmetric instability appears capable of explaining several types of rainbands. The most important next stage in the development of this subject is the implementation of conditional symmetric instability in numerical models. Using the mesoscale model of the Pennsylvania State University, Professors Warner and Clark will examine the model characteristics required of a realistic simulation of the rainband structures. The bulk of the rainfall received in temperate latitudes is associated with the passage of either warm or cold fronts. This work, when successfully completed, represents an important step forward in the numerical prediction of mesoscale precipitation.