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Robert Rogers
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Sim Aberson
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Altug Aksoy
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Bachir Annane
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Michael Black
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Joseph Cione
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Neal Dorst
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Jason Dunion
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John Gamache
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Stan Goldenberg
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Sundararaman Gopalakrishnan
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John Kaplan
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Bradley Klotz
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Sylvie Lorsolo
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Frank Marks
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Shirley Murillo
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Mark Powell
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Paul Reasor
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Kathryn Sellwood
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Eric Uhlhorn
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Tomislava Vukicevic
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Jun Zhang
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Xuejin Zhang

An update of the progress achieved as part of the NOAA Intensity Forecasting Experiment (IFEX) is provided. Included is a brief summary of the noteworthy aircraft missions flown in the years since 2005, the first year IFEX flights occurred, as well as a description of the research and development activities that directly address the three primary IFEX goals: 1) collect observations that span the tropical cyclone (TC) life cycle in a variety of environments for model initialization and evaluation; 2) develop and refine measurement strategies and technologies that provide improved real-time monitoring of TC intensity, structure, and environment; and 3) improve the understanding of physical processes important in intensity change for a TC at all stages of its life cycle. Such activities include the real-time analysis and transmission of Doppler radar measurements; numerical model and data assimilation advancements; characterization of tropical cyclone composite structure across multiple scales, from vortex scale to turbulence scale; improvements in statistical prediction of rapid intensification; and studies specifically targeting tropical cyclogenesis, extratropical transition, and the impact of environmental humidity on TC structure and evolution. While progress in TC intensity forecasting remains challenging, the activities described here provide some hope for improvement.

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