Tropical Depression Eight
... that Tropical Depression Eight in 1981 dropped up to 21 inches (530 mm) of rainfall in Texas, much of which fell in only six hours?
... that <b id="mwApk"><a href="./Tropical_Depression_Eight_(1981)" id="mwApo" rel="mw:WikiLink" title="Tropical Depression Eight (1981)">Tropical Depression Eight</a></b> in <a href="./1981_Atlantic_hurricane_season" id="mwAps" rel="mw:WikiLink" title="1981 Atlantic hurricane season">1981</a> dropped up to <span about="#mwt42" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"21"},"2":{"wt":"in"},"3":{"wt":"mm"}},"i":0}}]}' id="mwApw" typeof="mw:Transclusion">21 inches (530</span><span about="#mwt42" typeof="mw:Entity"> </span><span about="#mwt42">mm)</span> of rainfall in <a href="./Texas" id="mwAp0" rel="mw:WikiLink" title="Texas">Texas</a>, much of which fell in only six hours?