988 SXUS73 KDMX 190639 RERALO RECORD EVENT REPORT NATIONAL WEATHER SERVICE DES MOINES IA 140 AM CDT TUE APR 19 2011 ...RECORD DAILY SNOWFALL TIED AT WATERLOO... THE RECORD DAILY SNOWFALL WAS TIED AT WATERLOO IOWA FOR APRIL 18...WHEN A TRACE OF SNOW FELL. THIS TIES THE PREVIOUS RECORD OF A TRACE OF SNOWFALL WHICH LAST OCCURRED IN 1989. $$ AW