Istvan Szunyogh

Istvan Szunyogh

Professor, Graduate Committee Chair

Atmospheric dynamics, predictability, numerical weather prediction, data assimilation

  (979) 458-0553

  Eller O&M 1010A


My group employs advanced applied mathematical and statistical techniques to improve numerical weather prediction products. Our main focus is on the Earth's atmosphere, but the techniques we develop are also applicable to a wide range of complex physical systems. Our work involves both theoretical investigation and numerical experimentation with simple idealized and complex state-of-the-art numerical models. We carry out research in the following specific areas:  
  • Numerical weather prediction
  • Ensemble forecasting
  • Data assimilation
  • Dynamical systems
  • Predictability of the atmosphere and other complex systems
  • Local dynamics of atmospheric instabilities
  • Machine learning


Selected Publications

For a full list of publications, please see CV at the Links Section

* indicates a student and ** indicates a postdoctoral associate, whose research was advised or co-advised by I. S.

Books and Book Chapters
Selected Articles in Peer-reviewed Journals
  • Jia, Y., P. Chang, I. Szunyogh, R. Saravanan, and J. T. Bacmeister, 2019: A modeling strategy for the investigation of the effect of mesoscale SST feedback to the atmosphere. Geophys. Res. Lett., 46, 3982-3989.
  • Herrera*, A. M., I. Szunyogh, A. Brainard*, D. D. Kuhl, K. Hoppel, C. H. Bishop, T. R. Holt, Q. Zhao, S. Rainwater 2018: Regionally Enhanced Global (REG) 4D-Var. Mon. Wea. Rev., 146, 4015--4038.
  • Han*, F. and I. Szunyogh, 2018: A technique for the verification of precipitation forecasts and its application to a problem of predictability Mon. Wea. Rev., 146, 1303-1318.
  • Herrera*, M. A., I. Szunyogh, and J. Tribbia, 2016: Forecast uncertainty dynamics in the THORPEX Interactive Grand Global Ensemble (TIGGE). Mon. Wea. Rev., 144, 2739--2766.
  • Szunyogh, I., E. J. Kostelich, G. Gyarmati, E. Kalnay, B. R. Hunt, E. Ott, E. Satterfield*, and J. A. Yorke, 2008: A Local Ensemble Transform Kalman Filter data assimilation system for the NCEP global model. Tellus, 60A, 113-130.
  • Hunt, B. R., E. J. Kostelich, and I. Szunyogh, 2007: Efficient data assimilation for spatiotemporal chaos: a Local Ensemble Transform Kalman Filter. Physica D, 230, 112-126.
  • Baek*, S.-J., B. R. Hunt, I. Szunyogh, and E. Ott, 2006: Local ensemble Kalman filtering in the presence of model bias. Tellus, 58A, 293-306. 
  • Zimin*, A. V., I. Szunyogh, B. R. Hunt, and E. Ott, 2006: Extracting envelopes of nonzonally propagating wave packets. Mon. Wea. Rev., 134, 1329-1333.
  • Szunyogh I., E. J. Kostelich, G. Gyarmati, D. J. Patil, B. R. Hunt, E. Kalnay, E. Ott, and J. A. Yorke, 2005: Assessing a local ensemble Kalman filter: Perfect model experiments with the NCEP global model. Tellus, 57A, 528-545.
  • Ott, E., B. R. Hunt, I. Szunyogh, A. V. Zimin*, E. J. Kostelich, M. Corazza*, E. Kalnay, D. J. Patil, and J. A. Yorke, 2004: A local ensemble Kalman filter for atmospheric data assimilation. Tellus, 56A, 415-428.
  • Zimin*, A. V., I. Szunyogh, D. J. Patil, B. R. Hunt, and E. Ott, 2003: Extracting envelopes of Rossby wave packets. Mon. Wea. Rev., 131, 1011-1017.
  • Szunyogh, I., Z. Toth, A. V. Zimin*, S. Majumdar, and. A Persson, 2002: Propagation of the effect of targeted weather observations: The 2000 Winter Storm Reconnaissance program. Mon. Wea. Rev., 130, 1144-1165.
  • Szunyogh, I., Z. Toth, R. E. Morss, S. J. Majumdar, B. J. Etherton, and C. H. Bishop, 2000: The effect  of targeted dropsonde observations during the 1999 Winter Storm Reconnaissance program. Mon. Wea. Rev., 128, 3520-3537.
  • Kadar*, B., I. Szunyogh, and D. Devenyi, 1998: On the origin of model errors. Part II. Effects of the spatial discretization. Idojaras,101, 71-107.
  • Szunyogh I., E. Kalnay, and Z. Toth, 1997: A comparison of Lyapunov and optimal vectors in a low-resolution GCM. Tellus, 49A, 200-227.
  • Szunyogh I., 1993: Finite-dimensional quasi-Hamiltonian structure in simple model equations. Meteorology and Atmospheric Physics, 52, 49-57. 


Ph.D., Earth Sciences, Hungarian Academy of Sciences, Budapest, Hungary

Diploma, Meteorology, Eotvos Lorand University, Budapest, Hungary


College of Geosciences 2017 Distinguished Achievement Award: Faculty Excellence in Research

Certificate of Recognition, January 5, 2015 from the U.S. THORPEX Executive Committee. For his international leadership and predictability and data assimilation research contributions to U.S. participation in the World Meteorological Organization's THORPEX Weather Research Program

Certificate of Appreciation, November 17, 2014 from the World Weather Research Programme (WWRP) of the World Meteorological Organization (WMO). In recognition of an outstanding contribution to the WMO THORPEX program for the years 2005-2014.

Additional Information


  • Professor, September 2012-Present; Department of Atmospheric Sciences, Texas A&M University
  • Professor, February 2009-Present; Department of Atmospheric Sciences, Texas A&M University
  • Associate Research Scientist, July 2005–January 2009; Institute for Physical Science and Technology and Department of Atmospheric and Oceanic Science (formerly Department of Meteorology), Member of the Applied Mathematics and Scientific Computation Graduate Program and the Burgers Program for Fluid Dynamics, University of Maryland
  • Assistant Research Scientist, February 2001–June 2005; Institute for Physical Science and Technology and Department of Meteorology, University of Maryland
  • Visiting Scientist, September 1997–February 2001; University Corporation for Atmospheric Research (UCAR), based at the Environmental Modeling Center, National Centers for Environmental Prediction (formerly NMC), National Weather Service 
  • Postdoctoral Associate, March 1997–September 1997; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, based at NCEP
  • Postdoctoral Visiting Scientist, September 1996–February 1997; Mesoscale and Microscale Meteorology Division,National Center for Atmospheric Research, Boulder, Colorado, based at NCEP
  • Visiting Scientist at the Program “Mathematics of the Atmosphere and Ocean Dynamics” (July 1996-September 1996), Isaac Newton Institute for Mathematical Sciences, Cambridge, United Kingdom
  • Magyary Zoltan Postdoctoral Fellow, September 1995–August 1996; Department of Meteorology, E¨otv¨os Lorand University, Budapest, Hungary
  • Research Scientist, September 1998–September 1999 (on leave); Department of Meteorology, Eotvos Lorand University, Budapest, Hungary
  • Research Associate, September 1991–September 1998 (on leave after September 1995), Department of Meteorology, Eotvos Lorand University, Budapest, Hungary

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