"NOAA's Storm Prediction Center (SPC) has issued a rare "high risk" of severe weather from northwest Texas into western Oklahoma where there is the greatest chance of strong and long-track tornadoes on Monday afternoon and evening. This highest threat level of severe weather was last issued by SPC just over two years ago on May 18, 2017."

https://weather.com/storms/severe/news/2019-05-20-high-risk-tornado-outbreak-flash-flooding-southern-plains-oklahoma