SXUS73 KDMX 071222 RERALO RECORD EVENT REPORT NATIONAL WEATHER SERVICE DES MOINES IA 715 AM CDT SAT APR 7 2018 ...RECORD DAILY MINIMUM TEMPERATURE TIED AT WATERLOO IA... THE LOW TEMPERATURE SO FAR THIS MORNING IN WATERLOO HAS BEEN 12 DEGREES. THIS TIES THE RECORD FOR THIS DATE SET BACK IN 1972. $$ BF