Ryan Torn

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Introduction
Publications

Torn, R. D. and G. J. Hakim, 2013: Comparison of Wave Packets associated with Extratropical Transition and Winter Cyclones. Mon. Wea. Rev. Submitted.

Cavallo, S. M., R. D. Torn, C. Snyder, C. Davis, W. Wang and J. Done, 2013: Evaluation of the Advanced Hurricane WRF data assimilation system for the 2009 Atlantic hurricane season. Mon. Wea. Rev., 141, 523-541. PDF File.

Torn R. D. and D. Cook, 2013: The role of vortex and environment errors in Hurricanes Danielle and Karl (2010) genesis forecasts. Mon. Wea. Rev., 141, 232-251. PDF File.

Torn, R. D. and Davis, C. A., 2012: The influence of shallow convection on tropical cyclone track forecasts. Mon. Wea. Rev., 140, 2188-2197. PDF File.

Torn, R. D. and C. Snyder, 2012: Uncertainty of tropical cyclone best track information. Wea. Forecasting, 27, 715-729. PDF File.

Montgomery, M. T., C. Davis, T. Dunkerton, Z. Wang, C. Velden, R. Torn, S. Majumdar, F. Zhang, R. K. Smith, L. Bosart, M. M. Bell, J. S. Haase, A. Heymsfield, J. Jensen, T. Campos and M. A. Boothe, 2011: The Pre-Depression Investigation of Cloud Systems in the Tropics (PREDICT) Experiment: Scientific Basis, New Analysis Tools, and Some First Results. Bull. Amer. Meteor. Soc., 93, 153-172. PDF File.

Davis, C., W. Wang, S. Cavallo, J. Done, J. Dudhia, S. Fredrick, J. Michalakes, G. Caldwell, T. Engel, and R. Torn, 2011: High-resolution hurricane forecasts. Computing in Science and Engineering, 13 (1), 2230 PDF File.

Torn, R. D., 2010: Performance of a Mesoscale Ensemble Kalman Filter (EnKF) During the NOAA High-Resolution Hurricane Test. Mon. Wea. Rev., 138, 43754392. PDF File.

Davis, C., W. Wang, J. Dudhia, and R. Torn, 2010: Does increased horizontal resolution improve hurricane wind forecasts. Wea. Forecasting, 25, 18261841. PDF File.

Torn, R. D., 2010b: Diagnosis of the Downstream Ridging Associated with Extratropical Transition Using Short-term Ensemble Forecasts. J. Atmos. Sci., 67, 817833. PDF File.

Torn, R. D., 2010a: Ensemble-based sensitivity analysis applied to African Easterly Waves. Wea. Forecasting, 25, 6178. PDF File.

Torn, R. D., and G. J. Hakim, 2009: Initial condition sensitivity of Western-Pacific extratropical transitions determined using ensemble-based sensitivity analysis. Mon. Wea. Rev., 137, 3388-3406. PDF File.

Anderson, J, and T. Hoar, K. Raeder, H. Liu, N. Collins, R. Torn, and A. Arellano, 2008: The Data Assimilation Research Testbed: A community data assimilation facility. Bull. Amer. Meteor. Soc., 90, 1283-1296 PDF File.

Torn, R. D., and G. J. Hakim, 2009: Ensemble Data Assimilation applied to RAINEX observations of Hurricane Katrina (2005). Mon. Wea. Rev., 137, 2817-2829. PDF File

Hakim, G. J., and R. D. Torn, 2008: Ensemble Synoptic Analysis. Fred Sanders Monograph, Lance Bosart and Howard Bluestein, eds., American Meteorological Society, 147--161. Please contact me for a copy.

Torn, R. D., and G. J. Hakim, 2008: Performance characteristics of a pseudo-operational Ensemble Kalman Filter. Mon. Wea. Rev., 136, 3947--3963. PDF File.

Torn, R. D., and G. J. Hakim, 2008: Ensemble-based sensitivity analysis. Mon. Wea. Rev., 136, 663--677. PDF File.

Dirren, S., R. D. Torn, and G. J. Hakim, 2007: A data assimilation case-study using a limited-area ensemble Kalman filter. Mon. Wea. Rev., 135, 1455--1473. PDF File.

Torn, R. D., G. J. Hakim, and C. Snyder, 2006: Boundary conditions for a limited-area ensemble Kalman filter. Mon. Wea. Rev., 134, 2490--2502. PDF File.