Severe Local Storms Unit
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| Severe Local Storms Unit | |
|---|---|
| Name | Severe Local Storms Unit |
| Formation | 1952 |
| Type | Scientific forecasting unit |
| Headquarters | Norman, Oklahoma |
| Parent organization | National Weather Service |
| Region served | United States |
| Leader title | Director |
Severe Local Storms Unit The Severe Local Storms Unit is a specialized forecasting element within the United States operational meteorological system that focuses on convective hazards such as tornadoes, derechos, hailstorms, and severe wind events. It operates alongside national centers, regional offices, and university laboratories to provide situational awareness, watches, and guidance used by emergency managers, media, and aviation operators. The Unit’s work intersects with historic programs and institutions linked to mesoscale research, operational forecasting innovations, and event response.
History and Development
The Unit traces its lineage to post-World War II initiatives such as the National Severe Storms Project and the Project NIMROD experiments, emerging later in the context of the National Weather Service modernization and the establishment of the Storm Prediction Center and regional offices. Key milestones include collaborations with the Oklahoma Weather Lab, exchanges with the Air Force Cambridge Research Laboratories, and influence from programs like Project Cirrus and the Thunderstorm Project (1950s). Influential figures and institutions that shaped the Unit’s doctrine include forecasters and researchers from the University of Oklahoma, the Cooperative Institute for Mesoscale Meteorological Studies, the NOAA National Severe Storms Laboratory, and scientists associated with the National Center for Atmospheric Research. International interactions occurred with the UK Met Office, Deutscher Wetterdienst, and the Bureau of Meteorology during comparative studies of supercells and squall lines. Technological inflections were driven by the adoption of the WSR-57 radar, transition to WSR-88D Doppler radar networks, integration with the Advanced Weather Interactive Processing System, and later incorporation of satellite platforms such as GOES and numerical guidance from centers like the National Centers for Environmental Prediction.
Mission and Responsibilities
The Unit’s mission centers on detecting, analyzing, and communicating threats from localized severe convective phenomena to protect life and property by supporting the operational activities of the National Weather Service, Federal Emergency Management Agency, state emergency management agencies such as the Oklahoma Department of Emergency Management, and metropolitan warning systems in cities including Dallas, Atlanta, Chicago, and New York City. Responsibilities include issuing watch products in coordination with the Storm Prediction Center, providing real-time severe weather briefings for the Federal Aviation Administration and military users such as Air Combat Command, and liaising with broadcast partners like The Weather Channel and regional media outlets. The Unit also contributes to post-event damage surveys that inform agencies such as the National Transportation Safety Board and the Federal Highway Administration when convective events impact infrastructure.
Organizational Structure and Staffing
The Unit is organized into forecast teams, an operations center, a research integration branch, and an outreach section, staffed by meteorologists, mesoscale analysts, research scientists, and information technology specialists drawn from the National Weather Service, allied academic partners at the University of Oklahoma, Texas A&M University, Florida State University, and federal laboratories including NOAA and NCAR. Leadership typically includes a director, deputy director, and section chiefs who coordinate with directors at the Storm Prediction Center, regional directors of the National Weather Service, and program managers at the NOAA National Severe Storms Laboratory. Staffing models emphasize cross-training with personnel from Air Force Weather Agency, the Naval Research Laboratory, and visiting scholars from institutions like Massachusetts Institute of Technology and Princeton University.
Forecasting Methods and Tools
Forecasting relies on a suite of observational networks and numerical tools: real-time ingestion from the WSR-88D radar network, surface mesoscale observing systems including mesonets operated by Oklahoma Mesonet and Texas Tech University, satellite data from GOES-R Series, radiosonde launches coordinated with the University of Wyoming, and lightning detection from networks tied to Earth Networks and the National Lightning Detection Network. Numerical guidance derives from the Rapid Refresh, High-Resolution Rapid Refresh, and ensemble systems run by the National Centers for Environmental Prediction, as well as research models developed at NCAR and university consortia. Diagnostic techniques incorporate hodograph analysis, convective available potential energy (CAPE) assessments developed in academic literature, storm-relative helicity metrics used by mesoscale researchers, and Doppler-derived velocity couplet detection algorithms. Visualization and decision-support employ platforms such as the Advanced Weather Interactive Processing System, customized GIS tools, and integration with emergency management platforms used by FEMA and state agencies.
Notable Operations and Case Studies
The Unit played roles in major convective outbreaks and case studies including the Palm Sunday tornado outbreak (1965), the Super Outbreak of 1974, the 1985 United Kingdom tornado outbreak comparisons, and more recent events like the 2011 Super Outbreak, and the May 2013 Oklahoma tornado response. Case studies included collaborations with investigators from the Tornado Intercept Project and contributions to the Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX) field campaigns. Post-event analyses influenced building codes reviewed by the American Society of Civil Engineers and informed warning practices adopted by municipal authorities in metropolitan areas such as Joplin, Missouri, Moore, Oklahoma, and Tuscaloosa, Alabama.
Training, Research, and Collaboration
Training programs include joint courses with the National Weather Service Training Center, graduate internships with the University of Oklahoma School of Meteorology, and workshops co-sponsored with the American Meteorological Society and European Centre for Medium-Range Weather Forecasts delegates. Research collaborations span the Cooperative Institute for Severe and High-Impact Weather Research and Operations, projects funded by the National Science Foundation, and partnerships with the Defense Advanced Research Projects Agency for advanced sensing. The Unit contributes to peer-reviewed studies published in journals such as the Bulletin of the American Meteorological Society, Monthly Weather Review, and Weather and Forecasting, and engages in data-sharing agreements with international centers including the Met Office and the Australian Bureau of Meteorology.