DopplerGuide2nd_Edition

DopplerGuide2nd_Edition - A GUIDE FOR INTERPRETING DOPPLER...

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Unformatted text preview: A GUIDE FOR INTERPRETING DOPPLER VELOCITY PATTERNS: Northern Hemisphere Edition Rodger A. Brown and Vincent T. Wood NOAA/National Severe Storms Laboratory Norman, Oklahoma Second Edition June 2007 iii PREFACE Doppler weather radars provide valuable measurements that aid forecasters in preparing more accurate and timely warnings and short-term forecasts and that help other users to better understand a variety of atmospheric processes. Though computer algorithms are available to objectively interpret Doppler velocity data, weather decision makers also subjectively interpret the patterns found in Doppler velocity displays. This Guide was prepared to help Doppler radar users in the Northern Hemisphere become proficient in pattern interpretationthrough the use of simulated patterns representing flow fields within clear air and widespread precipitation as well as within tropical cyclones and convective storms. The first edition of the Guide, prepared by the authors in 1987 under an agreement with the NEXRAD Joint System Program Office (forerunner of the WSR88D Radar Operations Center), was used as part of initial WSR-88D training for National Weather Service forecasters. This second edition is slightly revised and contains Doppler velocity displays that use color scales that are color blind friendly. Since this Guide was prepared by federal government employees, it is not copyrighted. It may be freely copied and distributed with appropriate acknowledgments. PDF and HTML versions of the Guide, as well as the ability to download individual figures, are available at http:// publications .nssl.noaa.gov . v TABLE OF CONTENTS Page 1. BACKGROUND INFORMATION 1 1.1 Introduction 1 1.2 Review of Doppler Radar Principles 2 1.3 Organization of This Guide 5 2. INTERPRETATION OF DOPPLER VELOCITY PATTERNS IN CLEAR AIR AND WIDESPREAD PRECIPITATION 7 2.1 Introduction 7 2.2 Patterns Associated with Vertical Profiles having Constant Wind Direction 9 2.3 Patterns Associated with Nonuniform Horizontal Wind Fields 12 2.4 Patterns Associated with Vertical Profiles having Constant Wind Speed 14 2.5 Patterns Associated with Vertical Profiles of Varying Wind Speed and Direction 16 2.6 Patterns Associated with Vertical Discontinuities in the Wind Field 18 2.7 Patterns Associated with Horizontal Discontinuities in the Wind Field 20 3. INTERPRETATION OF DOPPLER VELOCITY PATTERNS WITHIN TROPICAL CYCLONES 22 4. INTERPRETATION OF DOPPLER VELOCITY PATTERNS WITHIN CONVECTIVE STORMS 26 4.1 Introduction 26 4.2 Patterns Associated with Constant Wind Speed and Direction 26 4.3 Patterns Associated with Axisymmetric Vortices 28 4.4 Patterns Associated with Axisymmetric Radial Flow 30 4.5 Mesocyclone and Divergence Patterns Viewed from Four Different Directions 32 4.6 Distortion of Doppler Velocity Patterns Owing to Proximity to the Radar 35 4.7 Patterns Associated with a Convergent/Divergent Mesocyclone 38 4.8 Patterns Associated with Two Mesocyclones having the Same Size and Strength...
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This note was uploaded on 09/13/2011 for the course MET 4994 taught by Professor Haijan during the Spring '11 term at FIU.

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DopplerGuide2nd_Edition - A GUIDE FOR INTERPRETING DOPPLER...

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