Sensitivity of Orographic Moist Convection to Landscape Variability: A Study of the Buffalo Creek, Colorado, Flash Flood Case of 1996

Abstract A number of numerical experiments with a high-resolution mesoscale model were conducted to study the convective rainfall event that caused the 1996 Buffalo Creek, Colorado, flash flood. Different surface conditions and treatments of land surface physics were utilized to assess the sensitivity of this orographic moist convection to local and regional landscape forcing. Given accurate large-scale synoptic conditions at the lateral boundaries, the mesoscale model with a convection-resolving grid shows reasonably good skill in simulating this convective event with a lead time of up to 12 h. Sensitivity experiments show that a primary reason for this success is the use of an advanced land surface model that provides time-varying soil-moisture fields. This land surface model plays an important role in capturing the complex interactions among the land surface, the PBL, cloud-modulated radiation, and precipitation. For the case simulated, such interactions contribute to the temporal and spatial distribut...

[1]  Juanzhen Sun,et al.  Dynamical and Microphysical Retrieval from Doppler Radar Observations Using a Cloud Model and Its Adjoint. Part I: Model Development and Simulated Data Experiments. , 1997 .

[2]  Thomas T. Warner,et al.  Nested-Model Simulation of Moist Convection: The Impact of Coarse-Grid Parameterized Convection on Fine-Grid Resolved Convection , 2000 .

[3]  R. Anthes,et al.  The Effect of Variations in Surface Moisture on Mesoscale Circulation , 1988 .

[4]  Jesslyn F. Brown,et al.  Seasonal Land‐Cover Regions of the United States , 1995, Annals of the Association of American Geographers.

[5]  George H. Leavesley,et al.  Prediction of a Flash Flood in Complex Terrain. Part II: A Comparison of Flood Discharge Simulations Using Rainfall Input from Radar, a Dynamic Model, and an Automated Algorithmic System , 2000 .

[6]  H. Pan,et al.  Nonlocal Boundary Layer Vertical Diffusion in a Medium-Range Forecast Model , 1996 .

[7]  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 .

[8]  H. Pan,et al.  A two-layer model of soil hydrology , 1984 .

[9]  Douglas A. Miller,et al.  A Conterminous United States Multilayer Soil Characteristics Dataset for Regional Climate and Hydrology Modeling , 1998 .

[10]  David Yates,et al.  Prediction of a flash flood in complex terrain. Part I: A comparison of rainfall estimates from radar, and very short range rainfall simulations from a dynamic model and an automated algorithmic system. , 2000 .

[11]  Roger A. Pielke,et al.  An Analytical Study of the Sea Breeze , 1989 .

[12]  Y. Xue,et al.  Modeling of land surface evaporation by four schemes and comparison with FIFE observations , 1996 .

[13]  David R. Stauffer,et al.  Use of Four-Dimensional Data Assimilation in a Limited-Area Mesoscale Model Part II: Effects of Data Assimilation within the Planetary Boundary Layer , 1991 .

[14]  Juanzhen Sun,et al.  Wind and Thermodynamic Retrieval from Single-Doppler Measurements of a Gust Front Observed during Phoenix II , 1994 .

[15]  H. Pan,et al.  Interaction between soil hydrology and boundary-layer development , 1987 .

[16]  Qin Xu.  Generalized Adjoint for Physical Processes with Parameterized Discontinuities. Part I: Basic Issues and Heuristic Examples , 1996 .

[17]  R. Pielke,et al.  Potential impacts on Colorado Rocky Mountain weather due to land use changes on the adjacent Great Plains , 1999 .

[18]  Konstantine P. Georgakakos,et al.  Quantitative Precipitation Forecast Techniques for Use in Hydrologic Forecasting , 1984 .

[19]  N. Tapper,et al.  A Numerical Study of Circulations Induced by a Dry Salt Lake , 1990 .

[20]  A. Blackadar,et al.  High resolution models of the planetary boundary layer , 1979 .

[21]  P. Wetzel,et al.  Effects of Spatial Variations of Soil Moisture and Vegetation on the Evolution of a Prestorm Environment: A Numerical Case Study , 1991 .

[22]  Nelson L. Seaman,et al.  A Simple Scheme for Objective Analysis in Curved Flow , 1985 .

[23]  R. Reynolds,et al.  The NCEP/NCAR 40-Year Reanalysis Project , 1996, Renewable Energy.

[24]  G. Grell.  Prognostic evaluation of assumptions used by cumulus parameterizations , 1993 .

[25]  G. Grell,et al.  A description of the fifth-generation Penn State/NCAR Mesoscale Model (MM5) , 1994 .

[26]  K. Mitchell,et al.  Simple water balance model for estimating runoff at different spatial and temporal scales , 1996 .

[27]  Richard A. Anthes,et al.  Enhancement of Convective Precipitation by Mesoscale Variations in Vegetative Covering in Semiarid Regions , 1984 .

[28]  M. Segal,et al.  Observational Evaluation of the Snow Breeze , 1991 .

[29]  Da‐Lin Zhang,et al.  A High-Resolution Model of the Planetary Boundary Layer—Sensitivity Tests and Comparisons with SESAME-79 Data , 1982 .

[30]  Juanzhen Sun,et al.  Evaluation of flash-flood discharge forecasts in complex terrain using precipitation , 2001 .

[31]  R. Pielke,et al.  The Impact of Crop Areas in Northeast Colorado on Midsummer Mesoscale Thermal Circulations , 1989 .

[32]  J. Dudhia,et al.  Nonhydrostatic, mesobeta-scale, real-data simulations with the Penn State University/National Center for Atmospheric Research mesoscale model , 1992 .

[33]  Roni Avissar,et al.  An Evaluation of the Scale at which Ground-Surface Heat Flux Patchiness Affects the Convective Boundary Layer Using Large-Eddy Simulations , 1998 .

[34]  J. Dudhia.  A Nonhydrostatic Version of the Penn State–NCAR Mesoscale Model: Validation Tests and Simulation of an Atlantic Cyclone and Cold Front , 1993 .

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

[36]  Ying-Hwa Kuo,et al.  Quantitative Precipitation Forecasting: Report of the Eighth Prospectus Development Team, U.S. Weather Research Program , 1998 .

[37]  D. Stauffer,et al.  Use of Four-Dimensional Data Assimilation in a Limited-Area Mesoscale Model. Part I: Experiments with Synoptic-Scale Data , 1990 .

[38]  J. Noilhan,et al.  Sensitivity study and validation of a land surface parameterization using the HAPEX-MOBILHY data set , 1990 .

[39]  Numerical Simulation of the 9 10 June 1972 Black Hills Storm Using CSU RAMS , 1997 .

[40]  M. Ek,et al.  The Influence of Atmospheric Stability on Potential Evaporation , 1984 .