Dedication |
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ix | |
Preface |
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xi | |
Acknowledgments |
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xiii | |
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xv | |
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List of abbreviations and acronyms |
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xxv | |
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1 | (26) |
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1.1 Basic definition of severe convective storms and scope of the material |
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1 | (2) |
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1.2 A brief history of severe storm field programs and numerical modeling efforts |
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3 | (20) |
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1.2.1 Field programs and instrument development |
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3 | (19) |
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1.2.2 Numerical model simulation experiments |
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22 | (1) |
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1.3 Methods to be employed |
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23 | (1) |
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1.4 General monographs and books |
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24 | (1) |
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1.5 References and bibliography |
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25 | (2) |
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27 | (68) |
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2.1 The equations of motion |
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27 | (5) |
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2.1.1 The horizontal equation of motion |
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27 | (1) |
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2.1.2 Buoyancy and the vertical equation of motion: defying gravity |
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28 | (4) |
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32 | (2) |
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2.3 Conservation of mass, and the Boussinesq and anelastic approximations |
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34 | (7) |
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2.3.1 The Boussinesq approximation |
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36 | (1) |
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2.3.2 Anelastic approximation |
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37 | (1) |
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38 | (3) |
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2.4 The vorticity and circulation equations |
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41 | (4) |
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2.5 The divergence equation and the buoyancy force |
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45 | (15) |
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2.5.1 Buoyancy-induced and dynamically induced pressure perturbations |
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46 | (5) |
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2.5.2 Retrieval of pressure and buoyancy fields from the wind field |
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51 | (2) |
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2.5.3 Quantitative analysis of a buoyant sphere in a resting environment |
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53 | (7) |
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2.6 Ertel's potential vorticity |
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60 | (1) |
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2.7 The Exner function as a vertical coordinate, potential temperature as a thermodynamic variable, and the pseudo-incompressible continuity equation |
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60 | (3) |
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2.8 Simple, idealized models of dry convection: plumes and bubbles |
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63 | (8) |
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2.8.1 Similarity models of plumes and thermals |
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65 | (1) |
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2.8.2 The plume dynamical model |
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66 | (5) |
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2.9 Introduction to Rayleigh-Benard convection |
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71 | (14) |
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2.9.1 Convection in a resting atmosphere without rotation |
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73 | (7) |
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2.9.2 Convection in a resting atmosphere with rotation |
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80 | (3) |
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2.9.3 Convection in a linearly sheared atmosphere without rotation |
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83 | (2) |
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2.10 Response of a Boussinesq atmosphere to heat sources |
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85 | (5) |
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2.11 Similarity of fluid dynamics equations to electromagnetic equations |
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90 | (1) |
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2.12 General monographs and books |
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90 | (1) |
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2.13 References and bibliography |
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90 | (5) |
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3 Ordinary-cell convective storms |
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95 | (70) |
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3.1 Observations and dynamics |
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96 | (24) |
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3.1.1 Conditional instability and the initiation of deep convection |
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96 | (2) |
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3.1.2 Entrainment and convective initiation |
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98 | (6) |
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3.1.3 Observed life cycle and vertical velocity |
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104 | (16) |
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3.2 Gust fronts and downdrafts |
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120 | (33) |
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3.2.1 Gust fronts in the absence of vertical wind shear |
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120 | (26) |
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3.2.2 Gust fronts in the presence of vertical shear: RKW theory |
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146 | (7) |
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3.2.3 Gravity waves forced by a density current |
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153 | (1) |
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3.3 Multicell convective storms |
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153 | (5) |
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3.4 General monographs and books |
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158 | (2) |
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3.5 References and bibliography |
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160 | (5) |
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165 | (100) |
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4.1 Supercells and the bulk Richardson number |
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166 | (7) |
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4.2 Observed supercell behavior and early theories |
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173 | (3) |
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4.3 Observed supercell structure: cloud features, precipitation distribution, polarimetric radar-observed parameters, and wind and temperature fields |
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176 | (33) |
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4.3.1 The main updraft in supercells |
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176 | (9) |
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4.3.2 Downdrafts: forward-flank downdraft and the rear-flank downdraft |
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185 | (20) |
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4.3.3 Precipitation type and distribution |
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205 | (4) |
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4.4 The production of mid-level rotation |
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209 | (4) |
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4.5 Interaction of vertical shear with updrafts/downdrafts forced by buoyancy: linear and nonlinear pressure effects |
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213 | (27) |
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4.5.1 Convective storm dynamics for straight hodographs |
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219 | (7) |
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4.5.2 Convective storm dynamics for curved hodographs |
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226 | (4) |
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4.5.3 Straight vs. curved hodograph dynamics: two paradigms |
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230 | (7) |
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4.5.4 Sensitivity of simulated supercell structure to environmental thermodynamic and cloud microphysics parameters |
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237 | (3) |
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4.6 The Deep Convergence Zone (DCZ) |
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240 | (1) |
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4.7 The production of low-level rotation |
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240 | (6) |
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4.7.1 The "owl horn" echo |
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246 | (1) |
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4.8 The life cycle of the mesocyclone and cyclic mesocyclogenesis |
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246 | (6) |
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4.9 Supercell structure and behavior in relation to inhomogeneities in the environment, and interactions with neighboring storms and surface boundaries |
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252 | (4) |
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4.9.1 Neighboring cell interaction |
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252 | (3) |
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4.9.2 Movement across outflow boundaries or fronts |
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255 | (1) |
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4.10 Rotating downdrafts in convective storms |
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256 | (2) |
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4.11 General monographs and books |
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258 | (1) |
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4.12 References and bibliography |
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258 | (7) |
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5 Mesoscale convective systems |
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265 | (42) |
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266 | (7) |
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273 | (19) |
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5.3 The dynamics and thermodynamics of mature MCS squall lines |
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292 | (4) |
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5.4 The production of vortices in MCSs |
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296 | (8) |
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5.5 General monographs and books |
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304 | (1) |
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5.6 References and bibliography |
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304 | (3) |
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307 | (110) |
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6.1 Basic observational aspects of tornadoes |
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307 | (19) |
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326 | (6) |
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332 | (2) |
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6.4 Types of tornadoes and tornado-like vortices |
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334 | (8) |
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6.5 Tornado vortex formation: tornadogenesis |
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342 | (18) |
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6.5.1 Tornado-like vortices in a vortex chamber |
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342 | (2) |
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6.5.2 Stretching of pre-existing vertical vorticity |
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344 | (3) |
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6.5.3 Tilting of horizontal vorticity into the vertical, followed by stretching underneath an updraft |
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347 | (5) |
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6.5.4 The dynamic pipe effect and the vertical propagation of vortices |
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352 | (2) |
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6.5.5 Role of downdrafts in enhancing and transporting vorticity |
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354 | (2) |
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356 | (1) |
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6.5.7 Two-celled mesocyclones and shear instabilities |
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357 | (1) |
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6.5.8 Cyclic tornadogenesis |
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357 | (2) |
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6.5.9 Counter-rotating tornado pairs |
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359 | (1) |
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360 | (44) |
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363 | (20) |
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6.6.2 Maximum possible wind speeds in tornadoes |
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383 | (21) |
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6.7 Economic and societal impacts |
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404 | (1) |
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6.8 Unresolved problems and challenges for future research, with suggestions for improved measurement capabilities |
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405 | (2) |
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6.9 General monographs and books |
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407 | (1) |
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6.10 References and bibliography |
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407 | (10) |
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7 Forecasting and future work |
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417 | (12) |
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7.1 Short-range forecasting |
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417 | (7) |
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7.1.1 Ingredients-based forecasting |
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417 | (4) |
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7.1.2 Model-based forecasting |
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421 | (2) |
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7.1.3 Evaluations of forecast skill |
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423 | (1) |
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7.2 Forecasting and climate change |
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424 | (1) |
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425 | (1) |
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7.4 General monographs and books |
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426 | (1) |
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7.5 References and bibliography |
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427 | (2) |
Appendix: Doppler radar analysis techniques |
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429 | (10) |
Index |
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439 | |