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Gust front in Niger topped with white cumulus on leading updraft. Cross section of gust front. From Droegmeier and Wilhelmson (1987). Haboob on July 25, 2007 at t = 0. Haboob on July 25, 2007 at t = 1 min. Dust wall over Niamey, Niger July 5, 2010. Grey gust front approaching
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Gust front in Niger topped with white cumulus on leading updraft
Cross section of gust front From Droegmeier and Wilhelmson (1987)
Grey gust front approaching In Sand Sea of Bodélé Depression
Gust front in Niger, with typical orange-red appearance