Georg Pistotnik (GSA) - The identification of drylines and their relevance for thunderstorms


Georg Pistotnik covers the topic of drylines, shows it's relevance in severe weather development.


Drylines are boundaries separating warmer and drier from cooler and moister air, usually resulting from differential diurnal heating and therefore vertical mixing. The most common and distinct dryline in the Alpine region is the boundary between Foehn winds (dynamically driven) and upvalley/upslope circulations (thermally driven). Thunderstorms often form along drylines and intensify when they move onto their moist side, where CAPE and vertical wind shear are systematically enhanced and favor convective organization. This presentation highlights how station and readiosonde data, high-resolution satellite imagery and even webcam images can be integrated into the nowcasting of drylines and resulting thunderstorms, using some prominent cases of the past few years in the eastern Alpine region.

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Lecture slides