Cold Air Damming

Cold Air Damming
After completing this module, the learner should be able to do the following things: Characterize cold air damming • Identify the elements that are required for a CAD event. • Identify sensible weather phenomena associated with cold air damming. • Describe the nature and importance of overrunning winds in a CAD event. • Describe the conditions leading to a barrier jet during a CAD event. • Identify the origin of precipitation particles in a CAD event. • Locate the deepest part of the pool of cold air in a CAD event. Classify CAD events • Recognize the three different types of CAD events. • Recall the different cooling processes important to cold air damming. • Describe the role different cooling processes play in the different types of CAD events. • Match cooling processes to their respective causes. Describe the climatology of cold air damming • Identify geographically where CAD events occur. • Remember the climatology of CAD events for the following: • Seasonal occurrence, • Probability of occurrence, and • Duration of events Identify a CAD event • Identify a CAD event from synoptic MSLP, 850 mb, and 500 mb pressure charts. • Identify a CAD event from soundings. • Identify a CAD event from surface observations. Forecast the start of a CAD event • Using MSLP charts, identify the synoptic conditions that lead to cold air damming for the Appalachians and other mountain ranges, including the Rocky Mountains, Alps, and Andes. • Identify atmospheric conditions that lead to terrain blocking and cold air damming. • Recognize the limitations of forecast models in a predicting a CAD event. Forecast the end of a CAD event • Using synoptic charts, choose the charts that indicate dissipation of a CAD event in a 24-hour time frame. • From soundings, recognize the atmospheric conditions leading to dissipation of a CAD event. • Identify surface observations that indicate the dissipation of a CAD event.