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.