Tornado Pathlength Forecasts from 2010 to 2011 Using Ensemble Updraft Helicity

AbstractExamining forecasts from the Storm Scale Ensemble Forecast (SSEF) system run by the Center for Analysis and Prediction of Storms for the 2010 NOAA/Hazardous Weather Testbed Spring Forecasting Experiment, recent research diagnosed a strong relationship between the cumulative pathlengths of simulated rotating storms (measured using a three-dimensional object identification algorithm applied to forecast updraft helicity) and the cumulative pathlengths of tornadoes. This paper updates those results by including data from the 2011 SSEF system, and illustrates forecast examples from three major 2011 tornado outbreaks—16 and 27 April, and 24 May—as well as two forecast failure cases from June 2010. Finally, analysis updraft helicity (UH) from 27 April 2011 is computed using a three-dimensional variational data assimilation system to obtain 1.25-km grid-spacing analyses at 5-min intervals and compared to forecast UH from individual SSEF members.

[1]  M. Nakanishi.  Large-Eddy Simulation Of Radiation Fog , 2000 .

[2]  Richard L. Thompson,et al.  A Climatology and Comparison of Parameters for Significant Tornado Events in the United States , 2012 .

[3]  Jordan G. Powers,et al.  A Description of the Advanced Research WRF Version 2 , 2005 .

[4]  William A. Gallus,et al.  Spring and Summer Severe Weather Reports over the Midwest as a Function of Convective Mode: A Preliminary Study , 2008 .

[5]  M. Chou,et al.  Technical report series on global modeling and data assimilation. Volume 3: An efficient thermal infrared radiation parameterization for use in general circulation models , 1994 .

[6]  Thomas M. Hamill,et al.  Verification of Eta–RSM Short-Range Ensemble Forecasts , 1997 .

[7]  Song‐You Hong,et al.  The WRF Single-Moment 6-Class Microphysics Scheme (WSM6) , 2006 .

[8]  John S. Kain,et al.  Extracting Unique Information from High-Resolution Forecast Models: Monitoring Selected Fields and Phenomena Every Time Step , 2010 .

[9]  H. Niino,et al.  An Improved Mellor–Yamada Level-3 Model with Condensation Physics: Its Design and Verification , 2004 .

[10]  Daniel S. Wilks,et al.  Statistical Methods in the Atmospheric Sciences: An Introduction , 1995 .

[11]  E. Rogers,et al.  The NCEP North American Mesoscale Modeling System : Recent changes and future plans , 2009 .

[12]  M. Xue,et al.  3DVAR and Cloud Analysis with WSR-88D Level-II Data for the Prediction of the Fort Worth, Texas, Tornadic Thunderstorms. Part I: Cloud Analysis and Its Impact , 2006 .

[13]  Song-You Hong,et al.  Development of an Effective Double-Moment Cloud Microphysics Scheme with Prognostic Cloud Condensation Nuclei (CCN) for Weather and Climate Models , 2010 .

[14]  Kristin M. Kuhlman.  A Realtime Weather-Adaptive 3DVAR Analysis System with Automatic Storm Positioning and On-demand Capability , 2011 .

[15]  S. J. Weiss,et al.  An Overview of the 2010 Hazardous Weather Testbed Experimental Forecast Program Spring Experiment , 2012 .

[16]  J. Hansen,et al.  A parameterization for the absorption of solar radiation in the earth's atmosphere , 1974 .

[17]  J. H. Steiger.  Tests for comparing elements of a correlation matrix. , 1980 .

[18]  Jidong Gao,et al.  The Advanced Regional Prediction System (ARPS), storm-scale numerical weather prediction and data assimilation , 2003 .

[19]  N. Roberts,et al.  Numerical Aspects of the Application of Recursive Filters to Variational Statistical Analysis. Part II: Spatially Inhomogeneous and Anisotropic General Covariances , 2003 .

[20]  Kevin W. Manning,et al.  Explicit Forecasts of Winter Precipitation Using an Improved Bulk Microphysics Scheme. Part I: Description and Sensitivity Analysis , 2004 .

[21]  S. J. Weiss,et al.  Toward Improved Convection-Allowing Ensembles: Model Physics Sensitivities and Optimizing Probabilistic Guidance with Small Ensemble Membership , 2010 .

[22]  A. Clark,et al.  Dryline Position Errors in Experimental Convection-Allowing NSSL WRF Model Forecasts and the Operational NAM , 2013 .

[23]  Gregory J. Stumpf,et al.  A Reassessment of the Percentage of Tornadic Mesocyclones , 2005 .

[24]  Zaviša I. Janić.  Nonsingular implementation of the Mellor-Yamada level 2.5 scheme in the NCEP Meso model , 2001 .

[25]  M. Xue.  3B.1 CAPS REALTIME STORM-SCALE ENSEMBLE AND HIGH-RESOLUTION FORECASTS AS PART OF THE NOAA HAZARDOUS WEATHER TESTBED 2007 SPRING EXPERIMENT , 2007 .

[26]  Semion Sukoriansky,et al.  A quasi-normal scale elimination model of turbulence and its application to stably stratified flows , 2006 .

[27]  Kristin M. Calhoun,et al.  A Real-Time Weather-Adaptive 3DVAR Analysis System for Severe Weather Detections and Warnings , 2013 .

[28]  G. Mellor,et al.  Development of a turbulence closure model for geophysical fluid problems , 1982 .

[29]  Richard L. Thompson,et al.  Close Proximity Soundings within Supercell Environments Obtained from the Rapid Update Cycle , 2003 .

[30]  E. Mlawer,et al.  Radiative transfer for inhomogeneous atmospheres: RRTM, a validated correlated-k model for the longwave , 1997 .

[31]  R Core Team,et al.  R: A language and environment for statistical computing. , 2014 .

[32]  J. Curry,et al.  A New Double-Moment Microphysics Parameterization for Application in Cloud and Climate Models. Part I: Description , 2005 .

[33]  K. Droegemeier,et al.  The Advanced Regional Prediction System (ARPS) – A multi-scale nonhydrostatic atmospheric simulation and prediction model. Part I: Model dynamics and verification , 2000 .

[34]  Jidong Gao,et al.  A Three-Dimensional Variational Data Analysis Method with Recursive Filter for Doppler Radars , 2004 .

[35]  Stanley G. Benjamin,et al.  Performance of Different Soil Model Configurations in Simulating Ground Surface Temperature and Surface Fluxes , 1997 .

[36]  J. Dudhia,et al.  Coupling an Advanced Land Surface–Hydrology Model with the Penn State–NCAR MM5 Modeling System. Part I: Model Implementation and Sensitivity , 2001 .

[37]  J. Dudhia.  Numerical Study of Convection Observed during the Winter Monsoon Experiment Using a Mesoscale Two-Dimensional Model , 1989 .

[38]  S. J. Weiss,et al.  Probabilistic Precipitation Forecast Skill as a Function of Ensemble Size and Spatial Scale in a Convection-Allowing Ensemble , 2011 .

[39]  Richard L. Thompson,et al.  Effective Storm-Relative Helicity and Bulk Shear in Supercell Thunderstorm Environments , 2007 .

[40]  H. Niino,et al.  An Improved Mellor–Yamada Level-3 Model: Its Numerical Stability and Application to a Regional Prediction of Advection Fog , 2006 .

[41]  S. J. Weiss,et al.  Some Practical Considerations Regarding Horizontal Resolution in the First Generation of Operational Convection-Allowing NWP , 2008 .

[42]  J. Pleim.  A Combined Local and Nonlocal Closure Model for the Atmospheric Boundary Layer. Part I: Model Description and Testing , 2007 .

[43]  M. Xue,et al.  The Advanced Regional Prediction System (ARPS) – A multi-scale nonhydrostatic atmospheric simulation and prediction tool. Part II: Model physics and applications , 2001 .

[45]  Stephen B. Fels,et al.  The simplified exchange method revisited: An accurate, rapid method for computation of infrared cooling rates and fluxes , 1991 .

[46]  Mikio Nakanish,et al.  Improvement Of The Mellor–Yamada Turbulence Closure Model Based On Large-Eddy Simulation Data , 2001 .

[47]  Song‐You Hong,et al.  Improvement of the K-profile Model for the Planetary Boundary Layer based on Large Eddy Simulation Data , 2003 .

[48]  M. Yau,et al.  A Multimoment Bulk Microphysics Parameterization. Part I: Analysis of the Role of the Spectral Shape Parameter , 2005 .

[49]  Charles A. Doswell,et al.  The tornadoes of spring 2011 in the USA: an historical perspective , 2012 .

[50]  Shu‐Hua Chen,et al.  A One-dimensional Time Dependent Cloud Model , 2002 .

[51]  James Correia,et al.  Forecasting Tornado Pathlengths Using a Three-Dimensional Object Identification Algorithm Applied to Convection-Allowing Forecasts , 2012 .

[52]  Harold E. Brooks,et al.  Tornadoes from squall lines and bow echoes. Part I: Climatological distribution , 2005 .

[53]  T. Hamill,et al.  Evaluation of Eta-RSM Ensemble Probabilistic Precipitation Forecasts , 1998 .

[54]  V Lakshmanan,et al.  4.5: WDSS-II: An Extensible, Multi-source Meteorological Algorithm Development Interface , 2002 .

[55]  D. Stensrud,et al.  Evaluation of a Short-Range Multimodel Ensemble System , 2001 .

[56]  Stanley G. Benjamin,et al.  Parameterization of cold-season processes in the MAPS land-surface scheme , 2000 .