509 SXUS99 KDSM 112232 RERDSM RECORD EVENT REPORT NATIONAL WEATHER SERVICE DES MOINES IA 532 PM CDT SUN APR 11 2004 ...RECORD DAILY LOW MINIMUM TEMPERATURE SET AT WATERLOO... THE TEMPERATURE AT 629 AM CDT THIS MORNING REACHED 16 DEGREES IN WATERLOO. THIS BREAKS THE PREVIOUS RECORD LOW FOR THE DATE...OF 17 DEGREES SET IN 1973. $$ GRAMS