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Conceptual models from the MetEd program Meteorology Education and Training Mesoscale Meteorology

Conceptual models from the MetEd program Meteorology Education and Training Mesoscale Meteorology Severe Convection II: Mesoscale Convective Systems Bow echo evolution Why and how does the bow echo evolve? We talk about the shape of the whole squall line,

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Conceptual models from the MetEd program Meteorology Education and Training Mesoscale Meteorology

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  1. Conceptual models from the MetEd program Meteorology Education and Training Mesoscale Meteorology Severe Convection II: Mesoscale Convective Systems Bow echo evolution Why and how does the bow echo evolve? We talk about the shape of the whole squall line, not about the shape of a single cell radar reflectivity

  2. Bow echo evolution For relative short squall lines Yellow lines: Mid-level storm-relative flow The echo has the bowed shape due to the mid-level intense flow (rear inflow jet) into the back of the system. The bow echoes are generally indicators of intense winds, not predictors. Large swaths of damaging surface winds are a particular concern with bow echoes.

  3. Yellow lines: Mid-level storm-relative flow MCV Why does it become asymmetric? Coriolis effect Long-living huge system. If a bow echo persists for hours, the Coriolis force will intensify the northern vortex (and weaken the southern vortex) creating the often-observed asymmetric evolution by the later stages.

  4. Asymmetric feature

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