extreme derecho
... that an extreme derecho that struck the southern portions of the Midwestern United States on May 8, 2009, is considered the worst in at least a decade?
... that an <b id="mwF7c"><a href="./May_2009_Southern_Midwest_derecho" id="mwF7g" rel="mw:WikiLink" title="May 2009 Southern Midwest derecho">extreme derecho</a></b> that struck the southern portions of the <a href="./Midwestern_United_States" id="mwF7k" rel="mw:WikiLink" title="Midwestern United States">Midwestern United States</a> on May 8, 2009, is considered the worst in at least a decade?