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Adam C. Varble, Stephen W. Nesbitt, Paola Salio, Joseph C. Hardin, Nitin Bharadwaj, Paloma Borque, Paul J. DeMott, Zhe Feng, Thomas C. J. Hill, James N. Marquis, Alyssa Matthews, Fan Mei, Rusen Öktem, Vagner Castro, Lexie Goldberger, Alexis Hunzinger, Kevin R. Barry, Sonia M. Kreidenweis, Greg M. McFarquhar, Lynn A. McMurdie, Mikhail Pekour, Heath Powers, David M. Romps, Celeste Saulo, Beat Schmid, Jason M. Tomlinson, Susan C. van den Heever, Alla Zelenyuk, Zhixiao Zhang, and Edward J. Zipser

used global numerical weather prediction and regional convection-allowing model guidance that was run every 6–12 h by SMN, the University of Illinois, and Colorado State University (CSU). When deep convection was forecasted, AMF1 radiosonde launch frequency was increased from 4- to 3-hourly between 0900 and 2100 LT. Additional sondes were also occasionally launched from the Villa Dolores site. In addition, Geostationary Operational Environmental Satellite-16 ( GOES-16 ) mesoscale domain sectors

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Jake P. Mulholland, Stephen W. Nesbitt, Robert J. Trapp, Kristen L. Rasmussen, and Paola V. Salio

.1002/2015RG000488 . 10.1002/2015RG000488 Johns , R. H. , and C. A. Doswell , 1992 : Severe local storms forecasting . Wea. Forecasting , 7 , 588 – 612 , https://doi.org/10.1175/1520-0434(1992)007<0588:SLSF>2.0.CO;2 . 10.1175/1520-0434(1992)007<0588:SLSF>2.0.CO;2 Johnson , R. H. , and B. E. Mapes , 2001 : Mesoscale processes and severe convective weather. Severe Convective Storms , Meteor. Monogr. , No. 50, Amer. Meteor. Soc., 71–122, https://doi.org/10.1175/0065-9401-28.50.71 . 10

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Jake P. Mulholland, Stephen W. Nesbitt, and Robert J. Trapp

convection-allowing NWP . Wea. Forecasting , 23 , 931 – 952 , https://doi.org/10.1175/WAF2007106.1 . 10.1175/WAF2007106.1 Klimowski , B. A. , M. R. Hjelmfelt , and M. J. Bunkers , 2004 : Radar observations of the early evolution of bow echoes . Wea. Forecasting , 19 , 727 – 734 , https://doi.org/10.1175/1520-0434(2004)019<0727:ROOTEE>2.0.CO;2 . 10.1175/1520-0434(2004)019<0727:ROOTEE>2.0.CO;2 Laing , A. G. , and J. M. Fritsch , 1997 : The global population of mesoscale convective

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Kristen L. Rasmussen, Melissa A. Burt, Angela Rowe, Rebecca Haacker, Deanna Hence, Lorena Medina Luna, Stephen W. Nesbitt, and Julie Maertens

understanding the complex communications and decision-making from experienced PIs such that this group can become future leaders in this field. Professional networking with top scientists in atmospheric science that can provide future employment and collaboration opportunities. Increase students’ knowledge of cloud physics, mesoscale dynamics, convective weather forecasting, and mountain meteorology. Guide students to complete a student-led project during the ASI that may include observations from their

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Zachary S. Bruick, Kristen L. Rasmussen, and Daniel J. Cecil

the understanding of how, why, and when hailstorms form and what characteristics may differentiate them from convection that does not produce hail. Through this analysis, a more comprehensive understanding of the climatology of hail and hail-producing environments will be presented. The results from this study will provide context for the results of the Remote Sensing of Electrification, Lightning, and Mesoscale/Microscale Processes with Adaptive Ground Observations (RELAMPAGO) field campaign (1

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Matthew R. Kumjian, Rachel Gutierrez, Joshua S. Soderholm, Stephen W. Nesbitt, Paula Maldonado, Lorena Medina Luna, James Marquis, Kevin A. Bowley, Milagros Alvarez Imaz, and Paola Salio

tornadic supercell in El Reno, Oklahoma, Seimon et al. (2016) claim a storm chaser video captured a hailstone that may have been >20 cm in maximum diameter; however, there was no further discussion or analysis. T able 1. Proposed hail size naming convention, based on previous usage and operational terminology. None of the aforementioned studies of giant or gargantuan hail focused on observed storm properties or environments. In contrast, Pojorlie et al. (2013) documented the synoptic and mesoscale

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Zachary S. Bruick, Kristen L. Rasmussen, Angela K. Rowe, and Lynn A. McMurdie

circulations modulate global circulations by disrupting the propagation of Rossby waves generated by tropical convection ( Grimm and Ambrizzi 2009 ). Therefore, ENSO impacts convection globally. In the United States, increased rainfall from mesoscale convective systems (MCSs) ( Anderson and Arritt 2001 ) and increased precipitation over the southern states and Gulf of Mexico ( Dai 2001 ; Lee et al. 2014 ) are correlated with El Niño, while more severe weather events in the southeast United States occur

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Hernán Bechis, Paola Salio, and Juan José Ruiz

.1175/2010MWR3227.1 . 10.1175/2010MWR3227.1 Schaefer , J. T. , 1974 : The life cycle of the dryline . J. Appl. Meteor. , 13 , 444 – 449 , https://doi.org/10.1175/1520-0450(1974)013<0444:TLCOTD>2.0.CO;2 . 10.1175/1520-0450(1974)013<0444:TLCOTD>2.0.CO;2 Schaefer , J. T. , 1986 : The dryline. Mesoscale Meteorology and Forecasting , P. S. Ray, Ed., Amer. Meteor. Soc., 549–572 . 10.1007/978-1-935704-20-1_23 Schultz , D. M. , C. C. Weiss , and P. M. Hoffman , 2007 : The synoptic regulation of

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