What is it about?

Several case studies are analyzed in detail, looking at the vertical forcing ahead of the cold front (with quasi-geostrophic theory using Q-vector analysis). A climatological perspective is also considered. It is found that the deformation of the isotherms with the developing frontal system causes quasi-geostrophic ascent in the warm sector. This leads to wind convergence near the ground, which can serve as a trigger for deep moist convection in an unstable airmass typically characterized by an elevated mixed layer (EML).

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Why is it important?

Pre-frontal summertime convergence lines are commonly analyzed by the European weather service agencies and frequently lead to organized thunderstorms with damaging hail and wind. We show that quasi-geostrophic theory, especially Q-vector analysis, can be a useful tool to understand and forecast these events.

Read the Original

This page is a summary of: The Origin of Western European Warm-Season Prefrontal Convergence Lines, Weather and Forecasting, October 2016, American Meteorological Society,
DOI: 10.1175/waf-d-15-0161.1.
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