138 SXUS99 KDSM 220716 RERDSM RECORD EVENT REPORT NATIONAL WEATHER SERVICE DES MOINES IA 216 AM CDT SAT MAY 22 2004 ...RECORD DAILY MAXIMUM RAINFALL SET AT MASON CITY AND WATERLOO... A RECORD RAINFALL OF 4.59 INCHES OCCURRED IN MASON CITY ON MAY 21ST. THIS IS THE HIGHEST DAILY RAINFALL TOTAL EVER IN THE MONTH OF MAY. IT IS THE 6TH HIGHEST DAILY RAINFALL TO EVER OCCUR. IT BROKE THE DAILY RECORD TOTAL OF 3.10 INCHES SET IN 1908...AND THE MONTHLY RECORD TOTAL OF 3.68 INCHES SET ON MAY 29TH 1980. A DAILY RECORD RAINFALL OF 2.08 INCHES OCCURRED IN WATERLOO ON MAY 21ST. THIS BREAKS THE OLD DAILY RAINFALL RECORD...OF 1.47 INCHES BACK IN 1939. $$ GRAMS