Tropical Storm Ignacio
... that Tropical Storm Ignacio of August 1997 caused unprecedented rainfall in San Francisco, California, which typically receives only a trace of precipitation during the month?
... that <b id="mwDek"><a href="./Tropical_Storm_Ignacio_(1997)" id="mwDeo" rel="mw:WikiLink" title="Tropical Storm Ignacio (1997)">Tropical Storm Ignacio</a></b> of August 1997 caused unprecedented rainfall in <a class="mw-redirect" href="./San_Francisco,_California" id="mwDes" rel="mw:WikiLink" title="San Francisco, California">San Francisco, California</a>, which typically receives only a trace of precipitation during the month?