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*Caption: Storm system over the United States as viewed at 13:30 UTC on May 20, 2019. This image was taken on the day of a Storm Prediction Center-issued High Risk; this is the highest possible risk available in the SPC's categorical outlooks. This day saw the outlining of a 45% tornado risk area for Oklahoma City and areas west. Later this same day, Particularly Dangerous Situation (PDS) Tornado Watch 199 was issued; this was only the second time the Storm Prediction Center ever issued a watch with fully maxed-out (at >95%) severe hazard (tornado, wind, hail) probabilities, along with Watch 235 in Alabama during the 2011 Super Outbreak. Ultimately, despite the extremely favorable ingredients for severe weather in place, the outbreak did not turn out nearly as many tornadoes (including strong to violent and long-track tornadoes) as expected. This was no regular forecast "bust" though; had the unanticipated mitigating factors (including complications from a cap advected in from Mexico) been removed, this outbreak could have gone so far as to even eclipse the major outbreak that occurred on May 3, 1999. For these reasons, despite being a day that did not have outstanding activity, it was a historic day.
*Image Credit: National Oceanic and Atmospheric Administration Environmental Visualization Laboratory, taken from GOES-16
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