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Oklahoma/Southern Kansas Tornadoes Service Assessment Oklahoma/Southern Kansas Tornado Outbreak of May 3, 1999 U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Weather Service Silver Spring, Maryland Cover: Supercell thunderstorms generated killer tornadoes in a swath from west-central Oklahoma through southern Kansas. Visible satellite imagery from Geostationary Operational Environmental Satellite-8, 6:45 p.m. Central Daylight Time (CDT), May 3, 1999. (Courtesy of the National Oceanic and Atmospheric Administration (NOAA)/National Environmental Satellite, Data and Information Service) Service Assessment Oklahoma/Southern Kansas Tornado Outbreak of May 3, 1999 August 1999 U.S. DEPARTMENT OF COMMERCE William M. Daley, Secretary National Oceanic and Atmospheric Administration D. James Baker, Administrator National Weather Service John J. Kelly, Jr., Assistant Administrator Preface On May 3, 1999, one of the largest tornado outbreaks in history struck west-central Oklahoma and southern Kansas, killing 48 people, leaving thousands homeless and resulting in over $1 billion in property damage. Due to the magnitude of this event, the National Weather Service (NWS) conducted a Service Assessment to examine the effectiveness of NWS warnings and other services in minimizing loss of life and injuries. Service Assessments are critical to the ongoing efforts of the NWS to improve the quality and timeliness of our warning services. Successful procedures are highlighted and shared with other offices; shortcomings are identified and resolved. This review process ensures that NWS forecast techniques, products and services will continue to evolve and improve. l Assistant Administrator for Weather Services August 1999 ii Table of Contents Page Preface ................................................................... ii Acronyms and Abbreviations .................................................. iv Service Assessment Team .................................................... vi Event Overview ............................................................ 1 Synoptic Overview ......................................................... 5 Facts, Findings and Recommendations - Part 1 Oklahoma and Southern Kansas Outbreak Combined ........................... 7 Oklahoma Outbreak Summary NWSFO Norman, Oklahoma .............................................. 9 Facts, Findings and Recommendations - Part 2 Oklahoma Outbreak .................................................... 15 Southern Kansas Outbreak Summary NWSO Wichita, Kansas ................................................. 25 Facts, Findings and Recommendations - Part 3 Southern Kansas Outbreak ............................................... 29 Practices to Emulate ........................................................ 33 Appendix A Fujita Tornado Intensity Scale .................................... A-1 Appendix B Event Statistics ............................................... B-1 Appendix C Oklahoma/Southern Kansas Tornado Outbreak of May 3, 1999 NWSFO Norman Chronological Product Highlights ................ C-1 Appendix D Oklahoma/Southern Kansas Tornado Outbreak of May 3, 1999 NWSO Wichita Chronological Product Log ....................... D-1 iii Acronyms and Abbreviations AFB Air Force Base AFOS Automation of Field Operations and Services APO AWIPS Program Office AWIPS Advanced Weather Interactive Processing System CAP Civil Air Patrol CAPE Convective Available Potential Energy CDT Central Daylight Time CRS Console Replacement System CWA County Warning Area EAS Emergency Alert System EMWIN Emergency Managers Weather Information Network EOC Emergency Operations Center FOS Family of Services HWO Hazardous Weather Outlook (Product Identifier) KICT Wichita, Kansas, WSR-88D KTLX Twin Lakes, Oklahoma, WSR-88D (metropolitan Oklahoma City radar) LDAD Local Data Acquisition and Dissemination LSR Local Storm Report (Product Identifier) MIC Meteorologist in Charge MSD Meteorological Services Division (National Weather Service) NAWAS National Warning System NCF Network Control Facility NEXRAD Next Generation Radar NIDS NEXRAD Information Dissemination Service NOAA National Oceanic and Atmospheric Administration NOW Short Term Forecast (Product Identifier) NSSL National Severe Storms Laboratory NWR NOAA Weather Radio NWS National Weather Service NWSFO NEXRAD Weather Service Forecast Office NWSO NEXRAD Weather Service Office NWWS NOAA Weather Wire Service OCS Oklahoma Climatological Survey OK-FIRST Oklahoma’s First-response Information Resource System using Telecommunications ORDA Open systems Radar Data Acquisition ORPG Open systems Radar Product Generator OSF Operational Support Facility (National Weather Service) OSO Office of Systems Operations (National Weather Service) iv PC Personal Computer PNS Public Information Statement PUP Principal User Processor RUC II Rapid Update Cycle version II SAME Specific Area Message Encoder SEL Severe Thunderstorm or Tornado Watch (Product Identifier) SKYWARN Term for Storm Spotter Network SOO Science and Operations Officer SPC Storm Prediction Center (National Weather Service) SPS Special Weather Statement (Product Identifier) SRH Southern Region Headquarters (National Weather Service) SVR Severe Thunderstorm Warning (Product Identifier) SVS Severe Weather Statement (Product Identifier) SWO Severe Weather Outlook (Product Identifier) TOR Tornado Warning (Product Identifier) TPMS Transition Power Maintenance System WarnGen Warning Generation (AWIPS software) WCM Warning Coordination Meteorologist WDSS Warning Decision Support System WISEII Warning and Interactive Statement Editor, version II WSOM Weather Service Operations Manual WSR-88D Weather Surveillance Radar-1988 Doppler (NEXRAD) ZFP Zone Forecast Product (Product Identifier) v Service Assessment Team The Service Assessment Team was activated on May 4, 1999. Team members traveled to the Next Generation Radar (NEXRAD) Weather Service Forecast Office (NWSFO) Norman, Oklahoma, on May 5 and left on May 10. A team meeting and an overview of the event was held on May 5 with representatives from NWSFO Norman, Storm Prediction Center (SPC), Operational Support Facility (OSF) and National Severe Storms Laboratory (NSSL) in attendance. At that time it was learned that the emergency manager representative selected for the team was unable to participate. Four team members were designated to begin the Service Assessment in Oklahoma while the fifth was assigned to perform the Service Assessment in southern Kansas. To assist the team member in Kansas, the team leader and NWSFO Norman Meteorologist in Charge (MIC) coordinated with the OSF and selected an OSF individual to help with the Kansas Service Assessment. Before leaving Oklahoma, the team completed the first draft of the report. After completion of the field work, the team continued to gather information and collaborate on the findings before preparation of the final version of this Service Assessment. The team was comprised of the following individuals: Ken Mielke Team Leader, MIC, NWSFO Great Falls, Montana Craig Edwards MIC, NWSFO Minneapolis, Minnesota Mike Foster Science and Operations Officer (SOO), NWSFO Fort Worth, Texas Larry Vannozzi Warning Coordination Meteorologist (WCM), NWSFO Lubbock, Texas Curtis Carey Southern Region Headquarters (SRH), Public Affairs Officer, Fort Worth, Texas Other valuable contributors include: Gayland Kitch Director, Emergency Management and Communications, Moore, Oklahoma Dan Carey Safety and Emergency Management Director, Cleveland County, Oklahoma Randall Duncan Emergency Management Director, Sedgwick County, Kansas John Ferree OSF/Training Branch, Norman, Oklahoma (assisted the team with the southern Kansas Service Assessment and the writing of this report) vi Dennis Walts NWS Headquarters, AWIPS Program Office (APO), Boulder, Colorado William Lerner NWS Headquarters, Office of Meteorology, Silver Spring, Maryland Linda Kremkau NWS Headquarters, Office of Meteorology, Silver Spring, Maryland Robert Saffle NWS Headquarters, Office of Systems Development, Silver Spring, Maryland Jerry Stephens NWS Headquarters, Office of Systems Operations (OSO), Silver Spring, Maryland The Service Assessment Team also acknowledges the valuable information provided by the staffs at NWSFO Norman, Oklahoma; NEXRAD Weather Service Office (NWSO) Wichita, Kansas; and the SPC. The tornado, which hit Moore/Oklahoma City, Oklahoma, is shown here near Amber, Oklahoma, at 6:30 p.m. CDT, May 3, 1999. (Photograph courtesy of the Oklahoma Climatological Survey) vii Radar reflectivity image from the Twin Lakes, Oklahoma, WSR-88D radar at 7:18 p.m. CDT, May 3, 1999, shows several severe thunderstorms in west-central Oklahoma and southern Kansas. (Courtesy of NOAA/NSSL) viii Event Overview A large part of the central United States was hit by a significant outbreak of tornadoes and other severe weather on May 3 and 4, 1999. From the afternoon of May 3 through the evening of May 4, there was an outbreak of tornadoes from southwest Texas through southeast South Dakota. The most devastating part of this outbreak occurred during the late afternoon and evening of May 3 over Oklahoma and southern Kansas (Figure 1). Between 6:23 p.m. and 7:50 p.m. CDT1 on Monday evening, May 3, a long-track, violent tornado traveled from near Chickasha, Oklahoma, to just east of Oklahoma City, Oklahoma. Along its path this tornado produced areas of F5 (see Appendix A, Fujita Tornado Intensity Scale) damage to both rural sections of central Oklahoma as well as densely populated areas
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