830 SXUS99 KDSM 211257 RERDSM RECORD EVENT REPORT NATIONAL WEATHER SERVICE DES MOINES IA 800 AM CDT SAT AUG 21 2004 ...MORE RECORD LOW TEMPERATURES... COOL AUGUST READINGS OF RECORD LOW TEMPERATURES WERE FELT IN NORTHERN AND CENTRAL IOWA. ESTERVILLE'S LOW OF 36 BROKE THE PREVIOUS LOW OF 45 DEGREES SET IN 1949. MASON CITY'S MERCURY ALSO PLUMMETED TO 36 DEGREES AND THE RECORD LOW HAD BEEN 41 SET IN 1925. WATERLOO LOWERED TO 39 DEGREES BREAKING THE OLD RECORD OF 43 SET IN 1950. $$ BB