From NWS
2002: Thunderstorms produced torrential rainfall and flash flooding across much of Delaware and Dubuque counties on the night of August 21-22 with the Dubuque airport recording 8.95 inches of rain overnight and Cascade reporting 7.55 inches.

1989: Severe thunderstorms crossed northern Iowa producing golf ball sized hail at May City in Osceola County and a wind gust to 66 mph at Balltown in Dubuque County. Lightning struck a barn in Fayette County killing 750 hogs.

22 August 1998 → The remnants of Hurricane Charley dumped 17.09 inches of rain on Del Rio, TX. More rain fell in one day than normally falls there in a year. 22 August 1999 → The citizens of Corpus Christi were very shaken when Hurricane Bret, a Category 4 hurricane with top winds of 140 mph, swirled around the Gulf of Mexico picking up steam as it headed toward the Texas coast. As Bret approached the coast, forecasters feared the hurricane would strike the city, but the storm turned west and came ashore in sparsely populated Kenedy County the early evening of August 22.

Posted under Weather History