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Lixion A. Avila and Stacy R. Stewart

Campeche on 27 June, when a broad area of low pressure formed. The wind circulation became better defined on 28 June, accompanied by a slight increase in the convective organization. An aircraft investigated the system and found tropical storm–force winds to the north of the center of the low, suggesting the formation of a tropical storm near 1800 UTC 28 June about 260 n mi (1 n mi = 1.852 km) east-southeast of Tampico, Mexico. Steady development occurred while Arlene moved generally westward, and the

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Eric S. Blake and Todd B. Kimberlain

-southeast of Acapulco. The depression moved generally west-northwestward to northwestward around the southwestern periphery of a midtropospheric ridge centered over the northwestern Caribbean Sea. The cloud pattern became better organized, and the depression strengthened into a tropical storm 12 h after genesis. In a moist, low shear environment and over sea surface temperatures of 29°–30°C, Beatriz quickly intensified. Data from a U.S. Air Force Reserve Hurricane Hunter mission around 1800 UTC 20 June

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John L. Beven II and Eric S. Blake

. The first was the failure of the QuikSCAT scatterometer in December 2009. The second was the presence of research aircraft data from the National Science Foundation (NSF), the National Center for Atmospheric Research, and the National Aeronautics and Space Administration (NASA) special field experiments during 2010: the Pre-Depression Investigation of Cloud Systems in the Tropics (PREDICT) and the Genesis and Rapid Intensification Processes (GRIP; Montgomery et al. 2012 ). These data augmented

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