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Sen Chiao and Gregory S. Jenkins

directly or indirectly influencing tropical cyclone rainbands through increased latent heat release. Both TD-4 and TD-8 are associated with (SAL) outbreaks. During August and September of 2006, the National Aeronautics and Space Administration (NASA) investigated the downstream aspects of the international African Monsoon Multidisciplinary Analyses (AMMA) campaign ( Redelsperger et al. 2006 ) which was denoted as NASA-AMMA (NAMMA; Zipser et al. 2009 ). There were several key objectives of the

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Anna Agustí-Panareda, Anton Beljaars, Carla Cardinali, Iliana Genkova, and Chris Thorncroft

associated with the heat low in the latitude band centered around 22°N (not shown). The mean MSLP difference between AMMA and pre-AMMA shows an increase mainly in the region around Agadez (not shown), which is consistent with the decrease in the mean temperature described above. The monsoon flow at low levels plays a key role in the moisture advection over the Sahel. This flow expands throughout the layer from the surface to 850 hPa over the central (10°W–10°E) and eastern Sahel, but only up to 925 hPa

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