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On 20 May 2013, a supercell thunderstorm developed west-southwest of Newcastle, Oklahoma, and eventually produced an EF-5 tornado that struck Moore, Oklahoma. This article describes how total lightning observations associated with this rotating storm could benefit warning operations. This effort focuses on (i) the Geostationary Operational Environmental Satellite-R pseudo-geostationary lightning mapper product, (ii) the National Aeronautics and Space Administration’s Short-term Prediction Research and Transition Center/Meteorological Development Laboratory’s total lightning tracking tool, and (iii) a real-time lightning jump algorithm currently under development. Use of these three tools revealed a distinct increase or “jump” in the storm’s lightning flash rates prior to reported severe weather. Lightning jumps occurred 19 min prior to severe hail and coincided with the storm’s initial growth, while the second lightning jump occurred 26 min prior to tornado touchdown. This second jump accompanied an increase in rotational depth and strength. These rapid increases in total lightning activity can provide improved situational awareness to forecasters, as lightning jumps relate to the rapid strengthening of a storm’s updraft and serve as a precursor to the stretching of the storm vortex prior to severe weather events. Although lightning jumps alone do not always indicate imminent severe weather, they (i) have the potential to help reduce false alarms and (ii) can guide forecasters to issue warnings earlier than they would have with radar data alone.

Total lightning observations and tools for the 20 May 2013 Moore, Oklahoma, tornadic supercell