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J. Manuel Lpez 《Atmospheric Research》2007,83(2-4):272-283
At approximately 6:10 UTC in the morning of 17th August 2003, a squall line developed over south Catalonia (the northeast region of Spain). During the next 9 h, the squall moved rapidly northeast and crossed Catalonia and the French regions of Languedoc–Roussillon and Province, damaging and uprooting hundreds of trees and blocking trains in the region. Wind gusts reached were recoded up to 52 m/s with evidence of F2 intensity damage. This case study shows the characteristics of a derecho (widespread convectively induced windstorm).Radar observations of the evolving squall line show signatures often correlated with damaging surface winds, including:
- a. Bow echoes,
- b. Rear inflow notches,
- c. Rear inflow jets,
- d. Medium altitude radial convergence,
- e. Narrow gradient of very marked reflectivity,
- f. Development of isolated cells ahead of the convective line,
- g. A band of convection off the northern end of the line known as a “warm advection wing”.
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