William Gallus

William Gallus

Synoptic and Mesocale Meteorology, Numerical Weather Prediction
3025 Agronomy
Dept. of Geological and Atmospheric Sciences
Iowa State University
Ames, IA 50011

About Me


B.S. (with Highest Honors) Pennsylvania State University, 1987
M.S. (NSF Graduate Fellow) Colorado State University, 1989
Ph.D. Colorado State University, 1993

My research interests primarily focus on improved prediction of small-scale atmospheric phenomena, especially thunderstorms and their rainfall. Improvements in computational technology in recent years have allowed for increasingly fine grid spacing to be used in numerical weather prediction models. Although the finer grid spacing allows the models to simulate increasingly realistic storm structure, forecasts of warm season thunderstorm system rainfall remain rather poor. My research with the WRF model suggests there is no way in the forseeable future that improvements can be made to guarantee good results consistently in a single deterministic forecast. Thus, more of my work uses ensemble forecast systems. In addition to studying ways to improve QPF, my research focuses on thunderstorm morphological evolution. I am also using ensembles to find ways to better predict winds for wind energy purposes. Finally, my interest in severe storms extends into other research projects including one directed toward improving student understanding of storm-scale dynamics through the use of virtual reality education tools, and another aiming to better understand near-ground tornado winds through damage surveys and use of a laboratory tornado simulator so that homes can be better designed to withstand tornado winds.

Research Projects

  • Gallus, W. A., Jr. and M. Segal, 2012-2016: Improved understanding of convective system evolution. NSF
  • Gallus, W. A., Jr., and K. Franz, 2014-2016: The use of radar data assimilation in high resolution WRF runs for improved short-term QPF for flood forecasting, convective morphology prediction, and probability of precipitation guidance. NOAA
  • Gallus, W. A., Jr., 2014-2016: Understanding the predictability of initiation and morphological evolution of PECAN nocturnal mesoscale convective systems. NSF.
  • Gallus, W. A., Jr., 2014-2015: Improved mesoscale model rainfall forecasts for flood forecasting at the Iowa Flood Center: Use of Radar Data Assimilation. Iowa Flood Center
  • Ogilvie, C., W. A. Gallus, Jr., and others, 2014-2019: Engaged to Excel (E2E). Howard Hughes Medical Institute
  • McCalley, J. and others (Gallus – senior personnel), 2012-2017: A new interdisciplinary PhD program in Wind Energy Science, Engineering, and Policy (WESEP). NSF

Meteorology 411/511 Synoptic Meteorology (3 credits)
Meteorology 417/517 Mesoscale Forecasting Laboratory (3 credits)
Meteorology 407/507 Mesoscale Dynamic Meteorology (3 credits)
Meteorology 107 Severe and Hazardous Weather (1 credit)

Recent Publications
Deppe, A. J., W. A. Gallus, Jr., and E. S. Takle, 2012: A WRF ensemble for improved wind forecasts at turbine height. Wea. Forecasting, (in press).

Le, V. T., and W. A. Gallus, Jr., 2012: Effect of an extratropical mesoscale convective system on water vapor transport in the upper troposphere/lower stratosphere: A modeling study. J. Geophys. Res., (in press).

Gallus, W. A., Jr., 2012: The Challenge of Warm-Season Convective Precipitation Forecasting. Rainfall Forecasting, T. S. Wong, Nova (in press).

Cervato, C., W. A. Gallus, Jr., P. Boysen, and M. Larsen, 2011: Dynamic Weather Forecaster: Results of the testing of a collaborative, on-line educational platform for weather forecasting. Earth Science Informatics, 4,4, 181-189.

Schaffer, C. J., W. A. Gallus, Jr., and M. Segal, 2011: Improving probabilistic ensemble forecasts of convection through the application of QPF-POP relationships. Wea. Forecasting, 26, 319-336.

Parham, T. L., C. Cervato, W. A. Gallus, Jr., M. Larsen, J. Hobbs, and T. Greenbowe, 2011: Does Students’ Source of Knowledge Affect their Understanding of Volcanic Systems? J. of College Science Teaching, 41, 1, 14-19.

Gallus, W. A., Jr., B. A. Colle, D.-L. Zhang, and P. Schumacher, 2010: Editorial. Weather and Forecasting, 25, 3-4.

Clark, A. J., W. A. Gallus, Jr., and M. L. Weisman, 2010: Neighborhood-based verification of precipitation forecasts from convection-allowing NCAR WRF model simulations and the operational NAM. Wea. Forecasting, 25, 1495-1509.

Parham, T. L., C. Cervato, W. A. Gallus, Jr., M. Larsen, P. Stelling, J. Hobbs, T. Greenbowe, T. Gupta, J. A. Knox, T. E. Gill, and A. Kar, 2010: The InVEST Volcanic Concept Survey

Exploring Student Understanding About Volcanoes. J. Geoscience Education. 58(3), 177-187.

Karstens, C. D., B. D. Lee, T. M. Samaras, W. A. Gallus, Jr., and C. A. Finley, 2010: TWISTEX 2008: In Situ and Mobile Mesonet Observations of Tornadoes. Mon. Wea. Rev., 138, 2570-2588.

Clark, A. J., W. A. Gallus, Jr., M. Xue, and F. Kong, 2010: Convection-allowing and convection-parameterizing ensemble forecasts of a mesoscale convective vortex and associated severe weather. Wea. Forecasting, 25, 1052-1081.

Duda, J. D., and W. A. Gallus, Jr., 2010: Spring and summer Midwestern severe weather reports in supercells compared to other morphologies. Wea. Forecasting, 25, 190-206.

Clark, A. J., W. A. Gallus, Jr., M. Xue, and F. Kong, 2010: Growth of Spread in Convection-allowing and Convection-parameterizing Ensembles. Wea. Forecasting, 25, 594-612.

Gallus, W. A., Jr., 2010: Application of object-based verification techniques to ensemble precipitation forecasts. Wea. Forecasting, 25, 144-158.

Le, V. T., W. A. Gallus, Jr., M. A. Olsen, and N. Livesy, 2010: Comparison of Aura MLS water vapor measurements with GFS and NAM analyses in the upper troposphere/lower stratosphere. J. Atmos. Ocean. Tech., 27, 274-289.