Impact of Air-Mass Inhomogeneities on the Meso-B-Scale Structure of Precipitation in Middle Latitude Cyclones

9520606霍顿这项研究的目的是发展预报24至48小时期间中尺度(20至200公里)降水的能力。这项研究中需要解决的一个关键领域是确定预测模型初始化的观测要求。拟议的研究将使人们更好地了解准确的中尺度降水预报的决定因素。具体地说，有必要评估中尺度初始条件对内部尺度相互作用和边界条件的相对重要性。以前的工作对冬季温带气旋提出了一种假设，即最初没有分解的中观结构对风暴系统中随后的中观降水结构可能很重要，特别是如果该结构包括潜在的涡度异常。拟议的研究将使用一个复杂的中尺度模式来探索这一假设，该模式可以显式地解析中尺度。这项研究将能够隔离初始条件、结构影响的具体方面，并在业务环境中对影响进行一般评估。***

9520606 Houghton This research is aimed at developing capabilities of predicting precipitation on the meso- scale (20 to 200 kilometers) for the 24 to 48 hour time period. A critical area to be addressed in this research is to determine the observational requirements for initialization of prediction models. The proposed research will result in a better understanding of determining factors for accurate meso- scale precipitation prediction. Specifically, it is necessary to assess the relative importance of meso- initial conditions to internal scale interactions and boundary conditions. Previous work has suggested a hypothesis for wintertime extratropical cyclones that meso- structure not initially resolved can be important for subsequent meso- precipitation structure in the storm system, particularly if the structure includes a potential vorticity anomaly. The proposed investigation will explore this hypothesis using a sophisticated mesoscale model that can explicitly resolve the meso- scale. The research will allow isolation of specific aspects of the initial condition structure impacts and general assessments of impacts in the operational setting. ***