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Personal profile


  • Ph.D. in Meteorology, The University of Oklahoma, 1994
  • M.S. in Meteorology, Texas A&M University, 1989
  • B.S. in Agriculture/Atmospheric Science, University of Missouri-Columbia, 1985

Personal profile

Dr. Trapp is a Professor with the Department of Atmospheric Sciences at the University of Illinois at Urbana-Champaign. Before joining Illinois in 2014, he was a Professor in the Department of Earth and Atmospheric Sciences at Purdue University from 2003-2014, and a research scientist with the National Severe Storms Laboratory (through the Cooperative Institute for Mesoscale Meteorological Studies) in Norman, Oklahoma from 1996-2003. Four years of his tenure with NSSL were spent as a visiting scientist at the National Center for Atmospheric Research in Boulder, Colorado.

Dr. Trapp's research interests include the dynamics and observations of mesoscale convective systems, severe thunderstorms, and tornadoes; mesoscale modeling and predictability.

Trapp received his B.S. degree from the University of Missouri-Columbia, M.S. degree from Texas A&M University, and Ph.D. degree from the University of Oklahoma. He was a National Research Council Postdoctoral Fellow.

Office Address

3062 Natural History Building

Office Phone


Fingerprint Fingerprint is based on mining the text of the expert's scholarly documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

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Research Output 1993 2019

A case study of terrain influences on upscale convective growth of a supercell

Mulholland, J. P., Nesbitt, S. W. & Trapp, R. J., Jan 1 2019, In : Monthly Weather Review. 147, 12, p. 4305-4324 20 p.

Research output: Contribution to journalArticle

cold pool
convective system
complex terrain
wind shear

A radar-based study of severe hail outbreaks over the contiguous United States for 2000–2011

Schlie, E. E. J., Wuebbles, D. J., Stevens, S., Trapp, R. & Jewett, B., Jan 2019, In : International Journal of Climatology. 39, 1, p. 278-291 14 p.

Research output: Contribution to journalArticle


Future changes in hail occurrence in the United States determined through convection-permitting dynamical downscaling

Trapp, R. J., Hoogewind, K. A. & Lasher-Trapp, S., Sep 1 2019, In : Journal of Climate. 32, 17, p. 5493-5509 17 p.

Research output: Contribution to journalArticle

greenhouse gas

The Dynamical Coupling of Convective Updrafts, Downdrafts, and Cold Pools in Simulated Supercell Thunderstorms

Marion, G. R. & Trapp, R., Jan 27 2019, In : Journal of Geophysical Research: Atmospheres. 124, 2, p. 664-683 20 p.

Research output: Contribution to journalArticle

vertical air currents
cold pool