13. Derecho Events: Blue Streaks in Straight-Line Winds
Widespread and long-lived windstorms linked with bands of fast moving thunderstorms, derechos can create amazing blue lightning displays. These events provide a special habitat for electrical discharges because of their straight-line winds and quick forward speed. The derecho frequently runs across a terrain with changing climatic conditions, including drier pockets of air. Particularly near the front edge of the storm system, this interaction can cause bright blue lightning to develop. Derechos’ fast-moving character allows the blue lightning to be seen over a great distance in a rather short period, producing a dynamic and always shifting light display. Blue lightning in a derecho can be a sign of both the strength of the storm and the atmospheric conditions it is running across. Storm chasers and meteorologists pay great attention to these blue flashes since they might reveal important details about the structure of the storm and likelihood of severe conditions. Researching blue lightning in derechos advances our knowledge of the evolution and spread of these strong and occasionally destructive storms.